QSAS Index ChampToGeo

Contents:

Overview

Potsdam's ISDC (Information System and Data Center) provides Champ's magnetic field data in CDF format, but the latter does not have its attributes (e.g. UNITS, FRAME, etc) compatbile with QSAS. The Champ's CDF file contains the following important variables: GEO_LAT, GEO_LON, GEO_ALT, QUALITY and VEC. The altitude, GEO_ALT, is given in km above a reference sphere. This plug-in combines the first three variables into a xyz vector in GEOC (geographic) frame.

Note that the helper file, CH_VEC_B_TOTAL.qat, must be located in the same folder as the Champ's CDF file. This file contains some meta-data for above variables so that, for example, VEC is recognized as a vector and can be plotted easily with QSAS.

Input data

The plug-in requires the following inputs:

Outputs

The output is a time series of position vectors of the Champ satellite in the specified reference frame. If a measurement vector in the NEC frame was given, then it is also converted to the desired reference frame.

Acknowledgement

We aknowledge the DFG VO 855/3 grant: "Multi-spacecraft analysis toolkit for Swarm".

Eugen Sorbalo, Jacobs University, 21 May 2012