TOMS Flight Data Analysis

The Total Ozone Mapping Spectrometer (TOMS) is a joint US/USSR scientific experiment launched aboard a USSR Meteor-3 spacecraft. The TOMS/Meteor-3 is the first NASA mission to place a Solid State Recorder (SSR) into orbit as the main data recording device for the instrument. A SSR is a RAM-based array of memory utilized for storing science and engineering telemetry on- board the spacecraft. SSRs provide advantages over traditional tape recorders in many respects. These include reduced power, weight, and volume, random access to addressed data without the penalty over a tape search, accomodating burst data transfers, selective data playback, ease of data compression, elimination of ground-based data reversal, etc. The TOMS/Meteor-3 SSR utilizes an array of Hitachi 256 Kbit SRAMs.

Have a look at the paper Single Event Effect Flight Data Analysis of Multiple NASA Spacecraft and Experiments; Implications to Spacecraft Electrical Designs by C.M. Seidleck, K.A. LaBel, et. al. It investigates in-flight SEEs observed on TOMS, CRUX, and SAMPEX.

Flight data available:

Hitachi 256 kbit SRAMs: Error Detection and Correction (EDAC) detects & records single and double bit errors

Data is available as a Mercator Projection, and as daily error counts

TOMS data is available for the following dates:
1993: July 18 through December 31
1994: January 2 through December 31
1995: January 1 through March 11
To have a look at specific data, please contact Christina Seidleck. She wrote the code & handles the data.

Return to Radiation Effects & Analysis Home Page
Curator: Martha O'Bryan
Last Revised April 06, 2001
A service of the Radiation Effects and Analysis Group, Kenneth A. LaBel, Group Leader