ENA imaging from the Swedish micro satellite astrid during the magnetic storm of 8 February, 1995

Details ENA imaging from the Swedish micro satellite astrid during the magnetic storm of 8 February, 1995 ENA imaging from the Swedish micro satellite astrid during the magnetic storm of 8 February, 1995

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.1061b&link_type=abstract

Advances in Space Research, Volume 20, Issue 4-5, p. 1061-1066.

Computer Science

16

Scientific paper

The generation of energetic neutral atoms (ENA) through charge exchange processes between hot (>= 1 keV) plasma and cold (< 0.1 eV) exospheric neutrals makes possible imaging of hot magnetospheric plasma. Here we report on the ENA observations from a polar 1000 km orbit carried out by PIPPI (Prelude In Planetary Particle Imaging), the ENA imager onboard the Swedish micro-satellite Astrid. We analyse ENA images in the energy range 26-52 keV obtained from the 8 February 1995 during a moderate geomagnetic storm (D_st≈-80 nT). The equatorial ion distribution is modeled by a 13 parameter model using a three component (H, He and O) Chamberlain exosphere model with parameters from the MSISE90 extended thermospheric model. The equatorial ion distribution, deduced from the ENA-images through forward modeling is located at MLT (magnetic local time) 1900 hours and occupies L-shell 4-6. Very low ENA fluxes were detected at energies >37 keV. It is suggested that the ENAs are produced by precipitating/mirroring ions on auroral/subauroral field lines coming from the near Earth current sheet charge exchanging with exospheric neutrals at near-exobase altitudes (300-400 km).

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