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# Directory Listing of Routines

# projects/maven/sta/mvn_sta_gen_snapshot

- MVN_STA_3D_SNAP
- MVN_STA_ENEPA2VV
- MVN_STA_SLICE2D_SNAP

# Routine Descriptions

## MVN_STA_3D_SNAP

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    PROCEDURE:       MVN_STA_3D_SNAP

    PURPOSE:         Plots 3D (angular) snapshots in a separate window
                     for times selected with the cursor in a tplot window.
                     Hold down the left mouse button and slide for a movie effect.
                     This version uses 'plot3d' (or 'spec3d') on packaged 3D data.

    INPUTS:          None.
                     But the specified time (or [tmin, tmax]) is set, it
                     automatically show the snapshot. In this case, the
                     cursor does not appear in a tplot window.

    KEYWORDS:

       EBINS:        Energy bins to plot (passed to plot3d).
                     Default = ddd.nenergy.

       CENTER:       Longitude and latitude of the center [lon, lat].

       MAP:          Mapping projection. See 'plot3d_options' for details.

       SPEC:         Plots energy spectra using 'spec3d'.
                     (Not working yet.)

       UNITS:        Units for the 'spec3d'.
                     (Not working yet.)

       ENERGY:       One or more energies to plot.  Overrides "EBINS".

       DDD:          Named variable to hold a 3D structure including mass
                     at the last time selected.

       SUM:          If set, use cursor to specify time ranges for averaging.

       SMO:          Sets smoothing in energy and angle.  Since there are only
                     4 theta bins depending APIDs, smoothing in that dimension is not recommended.

                     smo = [n_energy, n_phi, n_theta]  ; default = [1,1,1]

                     This routine takes into account the 360-0 degree wrap when
                     smoothing (But not working yet).

       SUNDIR:       Plots the direction of the Sun in STATIC coordinates.
                     (Not working yet.)

       LABEL:        If set, label the 3D angle bins.

       KEEPWINS:     If set, then don't close the snapshot window(s) on exit.

       ARCHIVE:      If set, show snapshots of archive data.

       BURST:        Synonym for "ARCHIVE".

       MASK_SC:      Masks solid angle bins that are blocked by the spacecraft.
                     (Not working yet.)

       MASS:         Selects ion mass/charge range to show. Default is all.

       MMIN:         Defines the minimum ion mass/charge to use.

       MMAX:         Defines the maximum ion mass/charge to use.

       M_INT:        Assumes ion mass/charge. Default = 1.

       ERANGE:       If set, plots energy ranges for averaging.

       WINDOW:       Sets the window number to show. Default = 0.

       MSODIR:       Plots the direction of the MSO axes in STATIC coordinates.

       APPDIR:       Plots the direction of the APP boom in STATIC coordinates.

       APID:         If set, specifies the APID data product to use.

       PLOT_SC:      Overplots the projection of the spacecraft body.

       SWIA:         Overplots the SWIA FOV in STATIC coordidates in
                     order to make sure the FOV overlap each other.

       ZLOG:         Sets a logarithmic color bar scaling.

       CT:           Sets a color table number based on 'loadct2'.
                     Default is 34 (Rainbow).

    NOTE:            This routine is written based on partially 'swe_3d_snap'
                     created by Dave Mitchell.

    USAGE EXAMPLES:
                     1.
                     mvn_sta_3d_snap, erange=[0.1, 1.d4], wi=1, /mso, /app, /label, /plot_sc

                     2.
                     ctime, t ; Clicks once or twice on the tplot window.
                     mvn_sta_3d_snap, t, erange=[0.1, 1.d4], wi=1, /mso, /app, /label, /plot_sc

                     3.
                     ctime, routine='mvn_sta_3d_snap'

    CREATED BY:      Takuya Hara on  2015-02-11.

     $LastChangedBy: haraday $
     $LastChangedDate: 2022-11-23 23:34:37 -0800 (Wed, 23 Nov 2022) $
     $LastChangedRevision: 31295 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/maven/sta/mvn_sta_gen_snapshot/mvn_sta_3d_snap.pro $

(See projects/maven/sta/mvn_sta_gen_snapshot/mvn_sta_3d_snap.pro)

## MVN_STA_ENEPA2VV

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    PROCEDURE:       MVN_STA_ENEPA2VV

    PURPOSE:         Plots STATIC ion distribution function f(vpara, vperp), assuming an ion gyrotropy.

    INPUTS:          None.
                     But the specified time (or [tmin, tmax]) is set, it
                     automatically show the snapshot. In this case, the
                     cursor does not appear in a tplot window.

    KEYWORDS:

       ARCHIVE:      Returns archive distribution instead of survey.

         BURST:      Synonym for "ARCHIVE".

          APID:      Specifies the STATIC APID data product.

          MASS:      Specifies the mass range.

         M_INT:      Specifies the mass/charge value.

         UNITS:      Specifies the units. Default is 'df'.

        WINDOW:      Specifies window number to plot.
                     A new window to show is generated as default.

         WSIZE:      Specifies the window size.

       MASK_SC:      Mask solid angle bins that are blocked by the spacecraft.
                     Default = 1

       KEEPWIN:      If set, then don't close the snapshot window on exit.

           SUM:      If set, use cursor to specify time ranges for averaging.

        ERANGE:      Specifies energy range to be used. Default is all.

        ZRANGE:      Specifies the color bar range.

    RESOLUTION:      Resolution of the mesh in perp direction (Def: 51).

        SMOOTH:      Width of the smoothing window (Def: no smoothing).

           MAP:      If set, taking account for the STATIC solid angular width
                     in computing the pitch angle.

        NOZERO:      Removes the data with zero counts for plotting.

        NOFILL:      Doesn't fill the contour plot with colors.

        NLINES:      Defines how many lines to use if using "nofill".
                     Default is 60.

      NOOLINES:      Suppresses the black contour lines.

     NUMOLINES:      Defines how many black contour lines. Default is 20.

      SHOWDATA:      Plots all the data points over the contour.

       DATPLOT:      Returns the plotting data shown lastly.

         DOPOT:      If set, correct for the spacecraft potential. The default is
                     to use the potential stored in the L2 CDF's or calculated by
                     mvn_sta_scpot_load.  If this estimate is not available, no
                     correction is made.

        SC_POT:      Override the default spacecraft potential with this.

           VSC:      Corrects for the spacecraft velocity.

    CREATED BY:      Takuya Hara on 2017-06-02.

    LAST MODIFICATION:
     $LastChangedBy: hara $
     $LastChangedDate: 2017-06-22 14:53:33 -0700 (Thu, 22 Jun 2017) $
     $LastChangedRevision: 23492 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/maven/sta/mvn_sta_gen_snapshot/mvn_sta_enepa2vv.pro $

(See projects/maven/sta/mvn_sta_gen_snapshot/mvn_sta_enepa2vv.pro)

## MVN_STA_SLICE2D_SNAP

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    PROCEDURE:       MVN_STA_SLICE2D_SNAP

    PURPOSE:         Plots 2D slice for the times and data type selected by cursor.
                     Hold down the left mouse button and slide for a movie effect.

    INPUTS:          None.
                     But the specified time (or [tmin, tmax]) is set, it
                     automatically show the snapshot. In this case, the
                     cursor does not appear in a tplot window.

    CAUTION:         *** !!! ***
                     The velocity is computed under the assumption that
                     all the observed ions are protons (i.e., m/q = 1) as default.
                     If user wants to show it as the other ion species, such as O+ or O2+,
                     user must use the "m_int" keyword like m_int=16 or m_int=32.
                     Please see also the usage example #2.
                     *** !!! ***

    KEYWORDS:        All the keywords included in 'slice2d' are acceptable.

       ARCHIVE:      Returns archive distribution instead of survey.

         BURST:      Synonym for "ARCHIVE".

        WINDOW:      Specifies window number to plot.
                     A new window to show is generated as default.

         BLINE:      Shows magnetic field direction by a black solid line.

           MSO:      Rotates into the MSO coordinates (no effect on 'BV',
                     'BE', and 'perp' cuts).

       KEEPWIN:      If set, then don't close the snapshot window on exit.

          MASS:      Selects ion mass/charge range to show. Default is all.

          MMIN:      Defines the minimum ion mass/charge to use.

          MMAX:      Defines the maximum ion mass/charge to use.

         M_INT:      Assumes ion mass/charge. Default = 1.

          APID:      If set, specifies the APID data product to use.

         DOPOT:      If set, correct for the spacecraft potential.  The default is
                     to use the potential stored in the L2 CDF's or calculated by
                     mvn_sta_scpot_load.  If this estimate is not available, no
                     correction is made.

        SC_POT:      Override the default spacecraft potential with this.

           VSC:      Corrects for the spacecraft velocity.

          VOFF:      Offset velocity for slice.  Centers the slice in the dimension
                     orthogonal to the slice.

      SHOWDATA:      Plos all the data points over the contour (symsize = showdata).
                     Pluses = Free sky bins, Crosses = Blocked bins.

        ERANGE:      Specifies the energy range used in analyses.

       DATPLOT:      Returns a structure which contains data used to plot.

         UNITS:      Specifies the units (e.g., 'eflux', 'df', etc). Default is 'df'.

         V_ESC:      Overplot a circle with radius = escape velocity.

          DIAG:      Print out diagnistics on the plot: S/C pot, S/C velocity

    USAGE EXAMPLES:
             1.      ; Normal case
                     ; Uses archive data, and shows the B field direction.
                     ; Draws the Xmso-Zmso plane slice.

                     mvn_sta_slice2d_snap, /arc, /bline, /mso, _extra={rot: 'xz'}

             2.      ; Specified time case
                     ; Selects the time to show.

                     ctime, t ; Clicks once or twice on the tplot window.

                     ; Draws the oxygen ion velocity distribution
                     ; function in the plane perpendicular to the B field.

                     mvn_sta_slice2d_snap, t, mass=[12., 20.], m_int=16., _extra={rot: 'perp'}

             3.      ; Advanced case
                     ; Uses 'ctime' procedure with "routine" keyword.

                     ctime, routine='mvn_sta_slice2d_snap'

    NOTE:            This routine is written partially based on 'mvn_swia_slice2d_snap'
                     created by Yuki Harada.

    CREATED BY:      Takuya Hara on 2015-05-22.

    LAST MODIFICATION:
     $LastChangedBy: dmitchell $
     $LastChangedDate: 2018-03-07 11:33:31 -0800 (Wed, 07 Mar 2018) $
     $LastChangedRevision: 24844 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/maven/sta/mvn_sta_gen_snapshot/mvn_sta_slice2d_snap.pro $

(See projects/maven/sta/mvn_sta_gen_snapshot/mvn_sta_slice2d_snap.pro)