Space Environment and Effects Measurements from ETS-VI Satellite

Details Space Environment and Effects Measurements from ETS-VI Satellite Space Environment and Effects Measurements from ETS-VI Satellite

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996esasp.392...51g&link_type=abstract

Environment Modelling for Space-based Applications, Symposium Proceedings (ESA SP-392). ESTEC Noordwijk, 18-20 September 1996. E

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Space environment and effects have been measured with the technical data acquisition equipment mounted on board ETS-VI (Engineering Test Satellite VI) from September 1994. The ETS-VI has been launched into an orbit with an apogee of about 38,000km, a perigee of about 8,000km and an inclination of about 13 degrees, by the National Space Development Agency of Japan (NASDA) on August 28, 1994. Altitude distributions of proton and electron fluxes and spectra have been obtained from a on board dosimeter and have been compared with the NASA's AP8MIN and AE8MIN models. The on-orbit measured electron fluxes are nearly same factor with the model, however the proton fluxes as measured in space are about 2 to 10 times bigger than the model-estimated values. The measured protons and electron energy spectra are harder than the spectra calculated by the NASA's models. Fluctuation of energetic particles flux at L=4-6 on the geomagnetic equator has been also observed. The flux reached its highest value few days after an enhancement of geomagnetic activity at night-side (sub-storm) occurred. A strong correlation between the trapped particles flux and the geomagnetic activity has been found. We report on the results of single event upset (SEU) measurement of radiation-hardened 64kb SRAM (NASDA qualified part) and heavy ions testing data in order to compare predictions and observations. SEU rate of the SRAM is approximately 1.2x10-7/bit/day, which is compared with the CREME code prediction rate using ground test data, 1.4x10-7/bit/day (solar max), 7.1x10-7/bit/day (solar min). The observed SEU have occurred at about GEO altitude (4.5<=L<=7). We also report on the measurements results of LET spectra by heavy ion telescope. Measured results show one factor higher than the integral LET flux data of CRRES satellite for solar max.

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