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# Directory Listing of Routines

# projects/mms/fgm

- MMS_FGM_FIX_METADATA
  Helper routine for setting FGM metadata
- MMS_LOAD_FGM
  Load MMS magnetometer data
- MMS_SPLIT_FGM_DATA
  Helper routine for splitting 4-vector FGM data (Bx, By, Bz, b_total)
- MMS_SPLIT_FGM_EPH_DATA
  Helper routine for splitting 4-vector position data (X, Y, Z, R)

# Routine Descriptions

## MMS_FGM_FIX_METADATA

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     PROCEDURE:
             mms_fgm_fix_metadata

     PURPOSE:
             Helper routine for setting FGM metadata

    $LastChangedBy: egrimes $
    $LastChangedDate: 2016-05-04 07:26:07 -0700 (Wed, 04 May 2016) $
    $LastChangedRevision: 21015 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/mms/fgm/mms_fgm_fix_metadata.pro $

(See projects/mms/fgm/mms_fgm_fix_metadata.pro)

## MMS_LOAD_FGM

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     PROCEDURE:
             mms_load_fgm

     PURPOSE:
             Load MMS magnetometer data

     KEYWORDS:
             trange:       time range of interest [starttime, endtime] with the format
                           ['YYYY-MM-DD','YYYY-MM-DD'] or to specify more or less than a day
                           ['YYYY-MM-DD/hh:mm:ss','YYYY-MM-DD/hh:mm:ss']
             probes:       list of probes, valid values for MMS probes are ['1','2','3','4'].
                           if no probe is specified the default is probe '1'
             level:        indicates level of data processing. the default if no level is specified is 'l2'
             datatype:     currently all data types for FGM are retrieved (datatype not specified)
             data_rate:    instrument data rates for FGM include 'brst' 'fast' 'slow' 'srvy'. The
                           default is 'srvy'.
             instrument:   FGM instruments are 'fgm', 'dfg' and 'afg'. default value is 'fgm'; you probably
                           shouldn't be using 'dfg' or 'afg' without talking to the instrument team
             local_data_dir: local directory to store the CDF files
             source:       specifies a different system variable. By default the MMS mission system
                           variable is !mms
             get_support_data: load support data (defined by support_data VAR_TYPE in the CDF)
             tplotnames:   names for tplot variables
             no_color_setup: don't setup graphics configuration; use this keyword when you're using
                           this load routine from a terminal without an X server running
             time_clip:    clip the data to the requested time range; note that if you do not use
                           this keyword you may load a longer time range than requested
             no_update:    set this flag to preserve the original data. if not set and newer data is
                           found the existing data will be overwritten
             suffix:       appends a suffix to the end of the tplot variable name. this is useful for
                           preserving original tplot variables.
             varformat:    should be a string (wildcards accepted) that will match the CDF variables
                           that should be loaded into tplot variables
             cdf_filenames:  this keyword returns the names of the CDF files used when loading the data
             cdf_version:  specify a specific CDF version # to load (e.g., cdf_version='4.3.0')
             latest_version: only grab the latest CDF version in the requested time interval
                           (e.g., /latest_version)
             major_version: only open the latest major CDF version (e.g., X in vX.Y.Z) in the requested time interval
             min_version:  specify a minimum CDF version # to load
             spdf:         grab the data from the SPDF instead of the LASP SDC (only works for public data)
             no_split_vars: don't split the FGM variables into vector + magnitude tplot variables; if set
                            vector transformations won't work on the FGM tplot variables.
             keep_flagged: don't remove flagged data (flagged data are set to NaNs by default, this keyword
                           turns this off)
             get_fgm_ephemeris: keep the ephemeris variables in the FGM files
             available:    returns a list of files available at the SDC for the requested parameters
                           this is useful for finding which files would be downloaded (along with their sizes) if
                           you didn't specify this keyword (also outputs total download size)
             versions:     this keyword returns the version #s of the CDF files used when loading the data
             always_prompt: set this keyword to always prompt for the user's username and password;
                           useful if you accidently save an incorrect password, or if your SDC password has changed
             tt2000: flag for preserving TT2000 timestamps found in CDF files (note that many routines in
                           SPEDAS (e.g., tplot.pro) do not currently support these timestamps)

     EXAMPLE:
         See mms_load_fgm_crib.pro and mms_load_fgm_burst_crib.pro for usage examples

         load MMS FGM burst data for MMS 1
         MMS>  mms_load_fgm, probes=['1'], data_rate='brst'

         load MMS FGM data for MMS 1 and MMS 2
         MMS>  mms_load_fgm, probes=[1, 2], trange=['2015-06-22', '2015-06-23']

     NOTES:
         The MMS plug-in in SPEDAS requires IDL 8.4 to access data at the LASP SDC

    $LastChangedBy: egrimes $
    $LastChangedDate: 2019-07-10 14:19:15 -0700 (Wed, 10 Jul 2019) $
    $LastChangedRevision: 27435 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/mms/fgm/mms_load_fgm.pro $

(See projects/mms/fgm/mms_load_fgm.pro)

## MMS_SPLIT_FGM_DATA

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     PROCEDURE:
             mms_split_fgm_data

     PURPOSE:
             Helper routine for splitting 4-vector FGM data (Bx, By, Bz, b_total)
             into 2 tplot variables, one for the vector (Bx, By, Bz), and one for the total

    $LastChangedBy: egrimes $
    $LastChangedDate: 2017-01-05 10:01:55 -0800 (Thu, 05 Jan 2017) $
    $LastChangedRevision: 22497 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/mms/fgm/mms_split_fgm_data.pro $

(See projects/mms/fgm/mms_split_fgm_data.pro)

## MMS_SPLIT_FGM_EPH_DATA

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     PROCEDURE:
             mms_split_fgm_eph_data

     PURPOSE:
             Helper routine for splitting 4-vector position data (X, Y, Z, R)
             into 2 tplot variables, one for the vector (X, Y, Z), and one for
             the magnitude

     DFG QL position variables:
      mms1_ql_pos_gse
      mms1_ql_pos_gsm
     FGM L2 position variables:
      mms1_fgm_r_gse_srvy_l2
      mms1_fgm_r_gsm_srvy_l2
     DFG/L2pre:
      mms1_pos_gse
      mms1_pos_gsm

    $LastChangedBy: egrimes $
    $LastChangedDate: 2016-05-03 09:57:57 -0700 (Tue, 03 May 2016) $
    $LastChangedRevision: 21004 $
    $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/mms/fgm/mms_split_fgm_eph_data.pro $

(See projects/mms/fgm/mms_split_fgm_eph_data.pro)