spacepy.irbempy.get_Lm

spacepy.irbempy.get_Lm(ticks, loci, alpha, extMag='T01STORM', intMag='IGRF', IGRFset=0, omnivals=None)[source]

Return the MacIlwain L value for a given location, time and model

Parameters:

- ticks (Ticktock class) : containing time information

  • loci (Coords class) : containing spatial information
  • alpha (list or ndarray) : pitch angles in degrees
  • extMag (string) : optional; will choose the external magnetic field model
    possible values [‘0’, ‘MEAD’, ‘T87SHORT’, ‘T87LONG’, ‘T89’, ‘OPQUIET’, ‘OPDYN’, ‘T96’, ‘OSTA’, ‘T01QUIET’, ‘T01STORM’, ‘T05’, ‘ALEX’, ‘TS07’]
  • intMag (string) : optional: select the internal field model
    possible values [‘IGRF’,’EDIP’,’JC’,’GSFC’,’DUN’,’CDIP’] For full details see get_Lstar
  • omni values as dictionary (optional) : if not provided, will use lookup table
Returns:

- results (dictionary) : containing keys: Lm, Bmin, Blocal (or Bmirr), Xj, MLT

if pitch angles provided in “alpha” then drift shells are calculated and “Bmirr” is returned if not provided, then “Blocal” at spacecraft is returned.