Energetic electron precipitation enhancements observed by STSAT-1
Abstract
In this presentation, we report electron precipitation enhancements observed by Korean Science and Technology SATellite-1 (STSAT-1). The STSAT-1 was launched on 27 September 2003 in a sun-synchronous orbit at an altitude of 680 km. The STSAT-1 possess a unique capability of three-axis attitude control system (ACS) to align Two SSTs (Solid State Telescope) perpendicular and parallel to the Earth's magnetic field direction to measure precipitating electrons in the energy range 170 keV to 360 keV. The SST has a 50 ms time resolution and 33.9° field of view (FOV) with a geometric factor of 0.045 cm2 sr. We observed electron precipitating enhancements near the plasmapause. SSTs show that electron flux for the perpendicular component equates to the parallel component, that implies the loss cone is completely filled by the energetic electron. With consideration for the bouncing period of 1 second, there should be fast electron pitch-angle diffusion process. The precipitation bands frequently observed with electron precipitation having soft energy spectra located in a larger area at a lower latitude than the precipitation band. We observed three kinds of low energetic electron precipitation bands by STSAT-1. So, we show the comparison of these events with the data of Polar Operational Environmental Satellites (POES) programs funded by the National Oceanic and Atmospheric Administration (NOAA) during the same period of time.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMSM33C3599S
- Keywords:
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- 2716 Energetic particles: precipitating;
- MAGNETOSPHERIC PHYSICSDE: 2720 Energetic particles: trapped;
- MAGNETOSPHERIC PHYSICSDE: 2772 Plasma waves and instabilities;
- MAGNETOSPHERIC PHYSICSDE: 2774 Radiation belts;
- MAGNETOSPHERIC PHYSICS