CRRES HEEF Electron 1-Min Equatorial Pitch Angle Distributions, UNIX Binary

Description

This data set from the High Energy Electron Fluxmeter (HEEF) instrument on the CRRES satellite includes equatorial pitch angle distributions of one-minute flux averages for 19 electron energy channels at 0.65 to 7.5 MeV. Input for creating this database was raw HEEF data at 0.512-sec time resolution. In one-minute intervals these high resolution data were sorted and averaged into five-degree local pitch angle bins (19 bins ranging from 0 to 90 degrees). The resulting average count rates were corrected for deadtime and temperature effects and then converted to flux units. For every one-minute interval (with average UT and local spatial coordinates), the 19 pitch angles were assigned a McIlwain L value computed from a combined IGRF-1985 and Olson-Pfitzer quiet static magnetic field model. The local pitch angle distribution was then mapped to the magnetic equator in 0.05-wide McIlwain L bins, assuming the conservation of the first adiabatic invariant. Finally, a loss cone subtraction was performed on the resultant equatorial pitch angle distribution. This equatorial mapping procedure was applied to both the first and second half of each CRRES orbit. Each one-minute record was tagged with two sets of eight ephemeris values - the first set corresponded to the beginning of the one-minute interval, the second with the interval's average UT. The data files (d04XXXX.pad) for CRRES orbit numbers XXXX = 15 - 1067 are provided in UNIX binary format along with FORTRAN software for extraction of selected parameters and a format description in Microsoft Word (*.doc) and Portable Document Format (*.pdf) files.

This data set is available on-line either via anonymous FTP login at nssdcftp.gsfc.nasa.gov in directory spacecraft_data/crres/particle_heef or via the web at the following URL:

ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/crres/particle_heef/