IMA extra file contents

This section provides technical information about IMA extra file.

Note

For users who wants to use the parameter file, refer to irfpy.vima.imaextra module.

IMA extra file

IMA extra for VEX, or Andrei’s file, can be read as follows. Also, netCDF4 should be installed.

pip install netcdf4

In addition, you may add the following setting into ~/.irfpyrc.

Start reading

To read the IMA EXTRA file, you can either specify the file name of the

>>> nc = irfpy.imacommon.imaextra2.ImaExtraFileCommon(fn)

Contents

Dimensions and variables can be read

>>> print nc.dim.keys()
[u'TimeLength', u'RmDim', u'AzPolDim', u'EnerDim', u'Time']
>>> print nc.dim.vars()
[u'AngTableN',
 u'HpSpec',
 u'ETableN',
 u'Pacc',
 u'RestRm',
 u'HeavySpec',
 u'StopTime',
 u'StartTime',
 u'Time',
 u'FracO2']

The dimensions are defined, for example, /Volumes/scidata/data/venus/DD/NC/IMAEXTRA/imaextra20123640214.nc.gz

Name	Length	Content
TimeLength	17	Length of time expression.
RmDim	32	Mass ring number
AzPolDim	16	Azimuth/Elevation dimension
EnerDim	96	Energy dimension
Time	39 (variable)	Time dimension

The variables are

Name	Length	Content
AngTableN	(39,)	?
HpSpec	(39,16,96,16)	Proton’s spectrum
ETableN	(39,)	?
Pacc	(39,)	Post acceleration
RestRm	(39,16,96,16,32)	Rest matrix
HeavySpec	(39,16,96,16)	Heavy spectrum
StopTime	(17,)	Stop time (string array…)
StartTime	(17,)	Start time (string array…)
Time	(39,17)	Array of time
FracO2	(39,16,96)	?

Time is a format of 17 length character. You may use irfpy.asperacommon.dd.ncdfdd2datetime() function to convert to datetime instance.

Note that these entries are slighly different from MEX/IMAEXTRA file.