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Procedure: trace2equator
Purpose: Generates a model field line footprint from an array of given
positions and times, will also trace field lines at the user's request
This program will always use the refined foot point mappings (a
modification made by Vassilis Angelopoulos to provide more accurate
mappings of foot points) as there is no Tsyganenko code to
perform equatorial traces.
Input:
tarray: N length array storing the position times in seconds utc since 1970
in_pos_array: Nx3 array representing the position series (in
km gsm by default)
out_foot_array: named variable in which to store the footprints
calculated by this function(will be an Nx3 array) will be returned
(in RE gsm by default)
Keywords:
out_trace_array(optional): named variable in which to store the traces of
field lines leading to footprints. Because traces are of variable
length, the returned array will be of dimensions NxDx3
D is the maximum number of vectors in any of the traces.
Shorter traces will have NaNs filling the space at the end
of the array
in_coord(optional): set this keyword to a string indicating the
coordinate system input position data is in.
(can be 'gei','gse','geo','gsm',or 'sm' default: gsm)
out_coord(optional): set this keyword to a string indicating the
coordinate system output data should be in.
(can be 'gei','gse','geo','gsm',or 'sm' default: gsm)
internal_model(optional): set this keyword to a string
indicating the internal model that should be used in tracing
(can be 'dip' or 'igrf' default:igrf)
external_model(optional): set this keyword to a string
indicating the external model that should be used in tracing
(can be 'none','t89','t96','t01', or 't04s' default: none)
SOUTH(optional): set this keyword to indicate that fields
should be traced towards the southern hemisphere. By default
they trace north.
KM(optional): set this keyword to indicate that input
and output will be in KM not RE
par(optional): parameter input for the external field model
if using t89 then it should be an N element array containing
kp values or a single kp value, if using t96,t01,t04s it
should be an N x 10 element array of parmod values or a 10
element array or a 1x10 element array. At the moment if an
external model is set and this is not set an error will be
thrown.
period(optional): the amount of time between recalculations of
geodipole tilt and input of new model parameters in
seconds (default: 60) increase this value to decrease
run time
if field line traces are requested this parameter is
ignored and new model parameters are input on each
iteration
error(optional): named variable in which to return the error state
of the procedure. 1 for success, 0 for failure
R0(optional): radius of a sphere (in re), defining the inner boundary of the tracing region
(usually, earth's surface or the ionosphere, where r0~1.0)
if the field line reaches that sphere from outside, its inbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.
(units are km if /km is set)
RLIM(optional) - radius of a sphere (in re), defining the outer boundary of the tracing region;
if the field line reaches that boundary from inside, its outbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.(default 60 RE)
(units are km if /km is set)
NOBOUNDARY(optional): Override boundary limits.
STORM(optional): Specify storm-time version of T01 external
magnetic field model use together with /T01.
add_tilt: Increment the default dipole tilt used by the model with
a user provided tilt in degrees. Result will be produced with TSY_DEFAULT_TILT+ADD_TILT
Value can be set to an N length array an M length array or a single element array.
N is the number of time elements for the data. M is the number of periods in the time interval.(determined by the period keyword)
If single element is provided the same correction will be applied to all periods.
If an N length array is provided, the data will be re-sampled to an M length array. Consequently, if
the values change quickly, the period may need to be shortened.
get_tilt: Returns the dipole_tilt parameter used for each period.
Returned value has a number of elements equal to the value returned by get_nperiod
set_tilt: Alternative alternative dipole_tilt value rather than the geopack tilt.
This input can be an M length array, and N length array or a single elemnt.
Value can be set to an N length array an M length array or a single element array.
N is the number of time elements for the data. M is the number of periods in the time interval.(determined by the period keyword)
If an N length array is provided, the data will be re-sampled to an M length array. Consequently, if
the values change quickly, the period may need to be shortened.
set_tilt will cause add_tilt to be ignored.
get_nperiod: Returns the number of periods used for the time interval= ceil((end_time-start_time)/period)
geopack_2008 (optional): Set this keyword to use the latest version (2008) of the Geopack
library. Version 9.2 of the IDL Geopack DLM is required for this keyword to work.
Example:
trace2equator,in_time,in_pos,out_foot
Notes:
1. Relies on the IDL/Geopack Module provided by Haje Korth JHU/APL
and N.A. Tsyganenko NASA/GSFC, if the module is not installed
this function will fail.
2. Has a loop with number of iterations =
(tarray[n_elements(t_array)]-tarray[0])/period
This means that as period becomes smaller the amount time of this
function should take will grow quickly.
3. If the trace_array variable is set
the period variable will be ignored. The program will
recalculate for each value, this will cause the program to
run very slowly.
4. All calculations are done internally in double precision
$LastChangedBy: pcruce $
$LastChangedDate: 2015-07-18 14:10:46 -0700 (Sat, 18 Jul 2015) $
$LastChangedRevision: 18174 $
$URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/tags/spedas_4_0/external/IDL_GEOPACK/trace/trace2equator.pro $
(See external/IDL_GEOPACK/trace/trace2equator.pro)
Procedure: trace2iono
Purpose: Generates a model field line footprint from an array of given
positions and times,will also trace field lines at the user's request
This program will always use the refined foot point mappings(a
modification made by Vassilis Angelopoulos to provide more accurate
mappings of foot points) unless you request the standard mapping;
Input:
tarray: N length array storing the position times in seconds utc since 1970
in_pos_array: Nx3 array representing the position series (in
km gsm by default)
out_foot_array: named variable in which to store the footprints
calculated by this function(will be an Nx3 array) will be returned
(in RE gsm by default)
Keywords:
out_trace_array(optional): named variable in which to store the traces of
field lines leading to footprints. Because traces are of variable
length, the returned array will be of dimensions NxDx3
D is the maximum number of vectors in any of the traces.
Shorter traces will have NaNs filling the space at the end
of the array
in_coord(optional): set this keyword to a string indicating the
coordinate system input position data is in.
(can be 'gei','geo','gse','gsm',or 'sm' default: gsm)
out_coord(optional): set this keyword to a string indicating the
coordinate system output data should be in.
(can be 'gei','geo','gse','gsm',or 'sm' default: gsm)
internal_model(optional): set this keyword to a string
indicating the internal model that should be used in tracing
(can be 'dip' or 'igrf' default:igrf)
external_model(optional): set this keyword to a string
indicating the external model that should be used in tracing
(can be 'none','t89','t96','t01', or 't04s' default: none)
SOUTH(optional): set this keyword to indicate that fields
should be traced towards the southern hemisphere. By default
they trace north.
KM(optional): set this keyword to indicate that input
and output will be in KM not RE
par(optional): parameter input for the external field model
if using t89 then it should be an N element array containing
kp values or a single kp value, if using t96,t01,t04s it
should be an N x 10 element array of parmod values or a 10
element array or a 1x10 element array. At the moment if an
external model is set and this is not set an error will be thrown.
period(optional): the amount of time between recalculations of
geodipole tilt and input of new model parameters in
seconds (default: 60) increase this value to decrease run time
if field line traces are requested this parameter is
ignored and new model parameters are input on each
iteration
error(optional): named variable in which to return the error state
of the procedure. 1 for success, 0 for failure
standard_mapping(optional): Set to use Tsyganenko's
unmodified version instead of the Angelopoulos's
refined version
R0(optional): radius of a sphere (in re), defining the inner boundary of the tracing region
(usually, earth's surface or the ionosphere, where r0~1.0)
if the field line reaches that sphere from outside, its inbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.
(units are km if /km is set)
RLIM(optional) - radius of a sphere (in re), defining the outer boundary of the tracing region;
if the field line reaches that boundary from inside, its outbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.(default 60 RE)
(units are km if /km is set)
NOBOUNDARY(optional): Override boundary limits.
STORM(optional): Specify storm-time version of T01 external
magnetic field model use together with /T01.
add_tilt: Increment the default dipole tilt used by the model with
a user provided tilt in degrees. Result will be produced with TSY_DEFAULT_TILT+ADD_TILT
Value can be set to an N length array an M length array or a single element array.
N is the number of time elements for the data. M is the number of periods in the time interval.(determined by the period keyword)
If single element is provided the same correction will be applied to all periods.
If an N length array is provided, the data will be re-sampled to an M length array. Consequently, if
the values change quickly, the period may need to be shortened.
get_tilt: Returns the dipole_tilt parameter used for each period.
Returned value has a number of elements equal to the value returned by get_nperiod
set_tilt: Alternative alternative dipole_tilt value rather than the geopack tilt.
This input can be an M length array, and N length array or a single elemnt.
Value can be set to an N length array an M length array or a single element array.
N is the number of time elements for the data. M is the number of periods in the time interval.(determined by the period keyword)
If an N length array is provided, the data will be re-sampled to an M length array. Consequently, if
the values change quickly, the period may need to be shortened.
set_tilt will cause add_tilt to be ignored.
get_nperiod: Returns the number of periods used for the time interval= ceil((end_time-start_time)/period)
geopack_2008 (optional): Set this keyword to use the latest version (2008) of the Geopack
library. Version 9.2 of the IDL Geopack DLM is required for this keyword to work.
Example: trace2iono,in_time,in_pos,out_foot
Notes:
1. Relies on the IDL/Geopack Module provided by Haje Korth JHU/APL
and N.A. Tsyganenko NASA/GSFC, if the module is not installed
this function will fail.
2. Has a loop with number of iterations =
(tarray[n_elements(t_array)]-tarray[0])/period
This means that as period becomes smaller the amount time of this
function should take will grow quickly.
3. If the trace_array variable is set
the period variable will be ignored. The program will
recalculate for each value, this will cause the program to
run very slowly.
4. All calculations are done internally in double precision
$LastChangedBy: pcruce $
$LastChangedDate: 2015-07-18 14:10:46 -0700 (Sat, 18 Jul 2015) $
$LastChangedRevision: 18174 $
$URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/tags/spedas_4_0/external/IDL_GEOPACK/trace/trace2iono.pro $
(See external/IDL_GEOPACK/trace/trace2iono.pro)
Procedure : ttrace2equator
Purpose: tplot wrapper for field line footprint and tracing routines
This program will always use the refined foot point mappings
(a modification made by Vassilis Angelopoulos to provide more accurate
mappings of foot points) as there is no Tsyganenko code to
perform equatorial traces.Model parameters can be provided
in the par array or individually, using the
parameter's name. If a model parameter is provided
by name, it will overwrite a part of any par value
provided. If a named parameter is provided, but is
unneeded by the model, it will be ignored.
Input:
in_pos_tvar: name of the tplot variable storing the
position information for tracing, input values should be in
'gse','gei','gsm',or 'sm'
Keywords:
newname(optional): name of the tplot variable in which output
footprints should be stored(default: in_pos_tvar+'_foot')
trace_var_name(optional): name of the tplot variable in
which to store the traces of field lines leading to footprints.
Because traces are of variable length, the returned array
will be of dimensions NxDx3
D is the maximum number of vectors in any of the traces.
Shorter traces will have NaNs filling the space at the end
of the array
in_coord(optional): set this keyword to the coordinate
system of the input, defaults to 'gsm', must match tplot
meta data
out_coord(optional): set this keyword to a string indicating
the coordinate system output data should be in, defaults to 'gsm'
(can be 'geo','gei','gse','gsm',or 'sm' default: the same as
the input)
internal_model(optional): set this keyword to a string
indicating the internal model that should be used in tracing
(can be 'dip' or 'igrf' default:igrf)
external_model(optional): set this keyword to a string
indicating the external model that should be used in tracing
(can be 'none','t89','t96','t01', or 't04s' default: none)
SOUTH(optional): set this keyword to indicate that fields
should be traced towards the southern hemisphere. By default
they trace north.
KM(optional): set this keyword to indicate that input
and output will be in KM not RE
par(optional): parameter input for the external field model
if using t89 then it should be an N element array containing
kp values or a single kp value, if using t96,t01,t04s it
should be an N x 10 element array of parmod values or a 10
element array. At the moment if an external model is set and
this is not set an error will be thrown. This value can also
be tplot variable name. If it is a tplot variable name it
will be interpolated to match the positions in pos_tvar
period(optional): the amount of time between recalculations of
geodipole tilt and input of new model parameters in
seconds (default: 60) increase this value to decrease
run time
if field line traces are requested this parameter is
ignored and new model parameters are input on each
iteration
error(optional): named variable in which to return the error
state of the procedure. 1 for success, 0 for failure
R0(optional): radius of a sphere (in re), defining the inner boundary of the tracing region
(usually, earth's surface or the ionosphere, where r0~1.0)
if the field line reaches that sphere from outside, its inbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.
(units are km if /km is set)
RLIM(optional) - radius of a sphere (in re), defining the outer boundary of the tracing region;
if the field line reaches that boundary from inside, its outbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.(default 60 RE)
(units are km if /km is set)
NOBOUNDARY(optional): Override boundary limits.
STORM(optional): Specify storm-time version of T01 external
magnetic field model use together with /T01.
pdyn(optional): Solar wind pressure(nanoPascals) should either be a
string naming a tplot variable or an array or a single
value. If a tplot input is used it will be interpolated to
match the time inputs from the position var. Non-tplot array values
must match the number of times in the tplot input for pos_gsm_tvar
dsti(optional): DST index(nanoTeslas) should either be a
string naming a tplot variable or an array or a single
value. If a tplot input is used it will be interpolated to
match the time inputs from the position var. Non-tplot array values
must match the number of times in the tplot input for pos_gsm_tvar
yimf(optional): y component of the interplanetary magnetic field
should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
zimf(optional): z component of the interplanetary magnetic field
should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
g1(optional): index describes solar wind conditions in the
previous hour, should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
g2(optional): index describes solar wind conditions in the
previous hour should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w1(optional): time integral from the beginning of a storm
can be an array or a tplot variable(see paper reference
below for definitions of w1-w6) or a single value.
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w2(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w3(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w4(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w5(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w6(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
get_tilt(optional): Set this value to a tplot variable name in which the geodipole tilt for each period will be returned
One sample will be returned for each period with time at the center of the period.
set_tilt(optional): Set this to a tplot variable name or an array of values containing the dipole tilt that should be used.
If a tplot input is used it will be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the tplot input for pos_gsm_tvar
add_tilt(optional): Set this to a tplot variable name or an array of values containing the values to be added to the dipole tilt
that should be used for each period. If a tplot input is used it will be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the tplot input for pos_gsm_tvar
get_nperiod(optional): Return the number of periods used in the time interval
geopack_2008 (optional): Set this keyword to use the latest version (2008) of the Geopack
library. Version 9.2 of the IDL Geopack DLM is required for this keyword to work.
Example: ttrace2equator,'tha_state_pos',newname='tha_out_foot'
See: crib_ttrace for more examples
Notes:
1. Relies on the IDL/Geopack Module provided by Haje Korth JHU/APL
and N.A. Tsyganenko NASA/GSFC, if the module is not installed
this function will fail.
2. Has a loop with number of iterations =
(tarray[n_elements(t_array)]-tarray[0])/period
This means that as period becomes smaller the amount time of this
function should take will grow quickly.
3. If the trace_array variable is set
the period variable will be ignored. The program will
recalculate for each value, this will cause the program to
run very slowly.
4. All calculations are done internally in double precision
$LastChangedBy: egrimes $
$LastChangedDate: 2017-09-05 12:34:37 -0700 (Tue, 05 Sep 2017) $
$LastChangedRevision: 23889 $
$URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/tags/spedas_4_0/external/IDL_GEOPACK/trace/ttrace2equator.pro $
(See external/IDL_GEOPACK/trace/ttrace2equator.pro)
Procedure : ttrace2iono
Purpose: tplot wrapper for field line footprint and tracing routines
This program will always use the refined foot point mappings
(a modification made by Vassilis Angelopoulos to provide more
accurate mappings of foot points) unless you request the standard
mapping. Model parameters can be provided in the par array
or individually, using the parameter's name. If a model parameter
is provided by name, it will overwrite an par value
provided. If a named parameter is provided, but is
unneeded by the model, it will be ignored.
Input:
in_pos_tvar: name of the tplot variable storing the
position information for tracing, input values should be in
'gse','gei','gsm',or 'sm'
Keywords:
newname(optional): name of the tplot variable in which output
footprints should be stored(default: in_pos_tvar+'_foot')
trace_var_name(optional): name of the tplot variable in
which to store the traces of field lines leading to footprints.
Because traces are of variable length, the returned array
will be of dimensions NxDx3
D is the maximum number of vectors in any of the traces.
Shorter traces will have NaNs filling the space at the end
of the array
in_coord(optional): set this keyword to the coordinate
system of the input, defaults to 'gsm', must match tplot
meta data
out_coord(optional): set this keyword to a string indicating
the coordinate system output data should be in, defaults to 'gsm'
(can be 'geo','gei','gse','gsm',or 'sm' default: the same as
the input)
internal_model(optional): set this keyword to a string
indicating the internal model that should be used in tracing
(can be 'dip' or 'igrf' default:igrf)
external_model(optional): set this keyword to a string
indicating the external model that should be used in tracing
(can be 'none','t89','t96','t01', or 't04s' default: none)
SOUTH(optional): set this keyword to indicate that fields
should be traced towards the southern hemisphere. By default
they trace north.
KM(optional): set this keyword to indicate that input
and output will be in KM not RE
par(optional): parameter input for the external field model
if using t89 then it should be an N element array containing
kp values or a single kp value, if using t96,t01,t04s it
should be an N x 10 element array of parmod values or a 10
element array or a 1x10 element array. At the moment if an
external model is set and this is not set an error will be
thrown. This can also contain a string naming a tplot
variable storing the par values. If a tplot variable is
named it will also be interpolated to match the position
data.
period(optional): the amount of time between recalculations of
geodipole tilt and input of new model parameters in
seconds (default: 60) increase this value to decrease
run time
if field line traces are requested this parameter is
ignored and new model parameters are input on each
iteration
error(optional): named variable in which to return the error
state of the procedure. 1 for success, 0 for failure
standard_mapping(optional): Set to use Tsyganenko's
unmodified version instead of the Angelopoulos's
refined version
R0(optional): radius of a sphere (in re), defining the inner boundary of the tracing region
(usually, earth's surface or the ionosphere, where r0~1.0)
if the field line reaches that sphere from outside, its inbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.
(units are km if /km is set)
RLIM(optional) - radius of a sphere (in re), defining the outer boundary of the tracing region;
if the field line reaches that boundary from inside, its outbound tracing is
terminated and the crossing point coordinates xf,yf,zf are calculated.(default 60 RE)
(units are km if /km is set)
NOBOUNDARY(optional): Override boundary limits.
STORM(optional): Specify storm-time version of T01 external
magnetic field model use together with /T01.
pdyn(optional): Solar wind pressure(nanoPascals) should either be a
string naming a tplot variable or an array or a single
value. If a tplot input is used it will be interpolated to
match the time inputs from the position var. Non-tplot array values
must match the number of times in the tplot input for pos_gsm_tvar
dsti(optional): DST index(nanoTeslas) should either be a
string naming a tplot variable or an array or a single
value. If a tplot input is used it will be interpolated to
match the time inputs from the position var. Non-tplot array values
must match the number of times in the tplot input for pos_gsm_tvar
yimf(optional): y component of the interplanetary magnetic field
should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
zimf(optional): z component of the interplanetary magnetic field
should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
g1(optional): index describes solar wind conditions in the
previous hour, should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
g2(optional): index describes solar wind conditions in the
previous hour should either be a string naming a tplot variable or an
array or a single value. If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w1(optional): time integral from the beginning of a storm
can be an array or a tplot variable(see paper reference
below for definitions of w1-w6) or a single value.
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w2(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w3(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w4(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w5(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
w6(optional): time integral from the beginning of a storm
can be an array or a tplot variable or a single value
If a tplot input is used it will
be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the
tplot input for pos_gsm_tvar
get_tilt(optional): Set this value to a tplot variable name in which the geodipole tilt for each period will be returned
One sample will be returned for each period with time at the center of the period.
set_tilt(optional): Set this to a tplot variable name or an array of values containing the dipole tilt that should be used.
If a tplot input is used it will be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the tplot input for pos_gsm_tvar
add_tilt(optional): Set this to a tplot variable name or an array of values containing the values to be added to the dipole tilt
that should be used for each period. If a tplot input is used it will be interpolated to match the time inputs from the position
var. Non-tplot array values must match the number of times in the tplot input for pos_gsm_tvar
get_nperiod(optional): Return the number of periods used in the time interval
geopack_2008 (optional): Set this keyword to use the latest version (2008) of the Geopack
library. Version 9.2 of the IDL Geopack DLM is required for this keyword to work.
Example: ttrace2iono,'tha_state_pos',newname='tha_out_foot'
See: crib_ttrace for more examples
Notes:
1. Relies on the IDL/Geopack Module provided by Haje Korth JHU/APL
and N.A. Tsyganenko NASA/GSFC, if the module is not installed
this function will fail.
2. Has a loop with number of iterations =
(tarray[n_elements(t_array)]-tarray[0])/period
This means that as period becomes smaller the amount time of this
function should take will grow quickly.
3. If the trace_array variable is set
the period variable will be ignored. The program will
recalculate for each value, this will cause the program to
run very slowly.
4. All calculations are done internally in double precision
$LastChangedBy: egrimes $
$LastChangedDate: 2017-09-05 12:27:32 -0700 (Tue, 05 Sep 2017) $
$LastChangedRevision: 23888 $
$URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/tags/spedas_4_0/external/IDL_GEOPACK/trace/ttrace2iono.pro $
(See external/IDL_GEOPACK/trace/ttrace2iono.pro)