;+ ;Procedure: tt96 ; ;Purpose: tplot wrapper for the functional interface to the idl ;geopack implementation of the Tsyganenko 1996 and IGRF fields model. ; ;Keywords: ; pos_gsm_tvar: the tplot variable storing the position in ; gsm coordinates ; ; 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 ; ; parmod(optional): can input the Nx10 parmod array used by the ; fortran Tsyganenko model. If passed as a raw array it will not be ; modified or interpolated so be sure its has the correct ; number of entries. It can also be passed as a tplot variable ; name in which case it will be interpolated. If values are ; passed individually and as par, the par values will be overwritten. ; ; period(optional): the amount of time between recalculations of ; geodipole tilt in seconds(default: 60) increase this ; value to decrease run time ; ; newname(optional):the name of the output variable. ; (default: pos_gsm_tvar+'_bt96') This option is ignored if ; globbing is used. ; ; error(optional): named variable in which to return the ; error state of this procedure call. 1 = success, 0 = failure ; ; Output: Stores the result of the field model calculations in tplot variables ; ; Notes: 1, converts from normal gsm to rgsm by dividing vectors by earth's ; radius(6374 km) ie inputs should be in km ; 2. Input must be in GSM coordinates ; 3. Haje Korth's IDL/Geopack DLM must be installed for this ; procedure to work ; 4. either the variables setting parmod or the variables ; setting the individual parameter arrays should be set because ; the defaults aren't scientifically accurate ; 5. model parameters that are input as tplot variables they ; will be interpolated to match the time values on the input ; position ; ; $LastChangedBy: pcruce $ ; $LastChangedDate: 2008-02-04 18:58:52 -0800 (Mon, 04 Feb 2008) $ ; $LastChangedRevision: 2346 $ ; $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/idl_socware/tags/tdas_5_11/external/IDL_GEOPACK/t96/tt96.pro $ ;- ;validates input parameters, in_val is the value passed to the main ;function, name string is a name used for error output,pos_name is the ;name of the position tplot variable ;returns -1L on failure function tt96_valid_param, in_val, name_string, pos_name COMPILE_OPT HIDDEN, IDL2 if keyword_set(in_val) then begin ;if in_val is a string, assume in_val is stored in a tplot variable if size(in_val, /type) eq 7 then begin if tnames(in_val) eq '' then begin message, /continue, name_string + ' is of type string but no tplot variable of that name exists' return, -1L endif ;make sure there are an appropriate number of pdyn values in the array tinterpol_mxn, in_val, pos_name, newname = 'verify_temp', error = e if e ne 0 then begin get_data, 'verify_temp', data = d_verify del_data, 'verify_temp' return, d_verify.y endif else begin message, /continue, 'error interpolating ' + name_string + ' onto position data' return, -1L endelse endif else return, in_val endif get_data, pos_name, data = d return, dblarr(n_elements(d.x)) end pro tt96, pos_gsm_tvar, pdyn = pdyn,dsti = dsti, yimf = yimf, zimf = zimf, period = period, parmod=parmod,newname = newname, error = error error = 0 if not keyword_set(pos_gsm_tvar) then begin message, /continue, 'pos_gsm_tvar must be set' return endif var_names = tnames(pos_gsm_tvar) if(var_names[0] eq '') then begin message, /continue, 'No valid tplot_variables match pos_gsm_tvar' return endif else if(n_elements(var_names) ne 1) then begin message, /continue, 'tt96 only accepts one tplot variable as input' return end var_name = var_names[0];just in case if keyword_set(parmod) then begin if size(parmod,/type) eq 7 then begin if tnames(parmod) eq '' then message,'parmod variable not valid tplot variable' tinterpol_mxn,parmod,var_name,newname='par_out' get_data,'par_out',data=dat par_temp = dat.y endif else par_temp = parmod if keyword_set(pdyn_dat) then begin pdyn_dat = tt96_valid_param(pdyn, 'pdyn', var_name) if(size(pdyn_dat, /n_dim) eq 0 && pdyn_dat[0] eq -1L) then return endif else begin pdyn_dat = par_temp[*,0] endelse if keyword_set(dsti_dat) then begin dsti_dat = tt96_valid_param(dsti, 'dsti', var_name) if(size(dsti_dat, /n_dim) eq 0 && dsti_dat[0] eq -1L) then return endif else begin dsti_dat = par_temp[*,1] endelse if keyword_set(yimf_dat) then begin yimf_dat = tt96_valid_param(yimf, 'yimf', var_name) if(size(yimf_dat, /n_dim) eq 0 && yimf_dat[0] eq -1L) then return endif else begin yimf_dat = par_temp[*,2] endelse if keyword_set(zimf_dat) then begin zimf_dat = tt96_valid_param(zimf, 'zimf', var_name) if(size(zimf_dat, /n_dim) eq 0 && zimf_dat[0] eq -1L) then return endif else begin zimf_dat = par_temp[*,3] endelse endif else begin pdyn_dat = tt96_valid_param(pdyn, 'pdyn', var_name) if(size(pdyn_dat, /n_dim) eq 0 && pdyn_dat[0] eq -1L) then return dsti_dat = tt96_valid_param(dsti, 'dsti', var_name) if(size(dsti_dat, /n_dim) eq 0 && dsti_dat[0] eq -1L) then return yimf_dat = tt96_valid_param(yimf, 'yimf', var_name) if(size(yimf_dat, /n_dim) eq 0 && yimf_dat[0] eq -1L) then return zimf_dat = tt96_valid_param(zimf, 'zimf', var_name) if(size(zimf_dat, /n_dim) eq 0 && zimf_dat[0] eq -1L) then return endelse get_data, var_name, data = d, dlimits = dl, limits = l ;several nested ifs to check this ;variable's coordinate system in a ;safe way(ie won't reference any struct elements that don't exist) if not keyword_set(dl) then begin message, /continue, 'dlimits structure not set, make sure input variables are in gsm coordinates or results will be invalid' endif else begin str_element, dl, 'data_att', success = s if s eq 0 then begin message, /continue, 'dlimits.data_att structure not set, make sure input variables are in gsm coordinates or results will be invalid' endif else begin str_element, dl.data_att, 'coord_sys', success = s if s eq 0 then begin message, /continue, 'dlimits.data_att.coord_sys value not set, make sure input variables are in gsm coordinates or results will be invalid' endif else if dl.data_att.coord_sys ne 'gsm' then begin message, /continue, 'input variable is in the wrong coordinate system, returning' return ;definitely wrong coordinate system=error endif endelse endelse ;do the calculation, division converts position into earth radii units mag_array = t96(d.x, d.y/6374, pdyn_dat, dsti_dat, yimf_dat, zimf_dat, period = period) if size(mag_array, /n_dim) eq 0 && mag_array[0] eq -1L then begin message, /continue, 'Tysganenko model query failed, returning' return endif ;sometimes v element is present, sometimes not ;if it is around it is stored in output so information is not lost str_element, d, 'v', success = s if s eq 1 then $ d_out = {x:d.x, y:mag_array, v:d.v} $ else $ d_out = {x:d.x, y:mag_array} if keyword_set(newname) then $ store_data, newname, data = d_out, dlimits = dl, limits = l $ else $ store_data, var_name +'_bt96', data = d_out, dlimits = dl, limits = l ;signal success error = 1 return end