Short-duration Electron Precipitation Studied by Test Particle Simulation
Energy spectra of electron microbursts from 170 keV to 340 keV have been measured by the solid-state detectors aboard the low-altitude (680 km) polar-orbiting Korean STSAT-1 (Science and Technology SATellite). These measurements have revealed two important characteristics unique to the microbursts...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2015-12-01
|
| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2015/v32n4/OJOOBS_2015_v32n4_317.pdf |
| _version_ | 1797368577038221312 |
|---|---|
| author | Jaejin Lee Kyung-Chan Kim Jong-Gil Lee |
| author_facet | Jaejin Lee Kyung-Chan Kim Jong-Gil Lee |
| author_sort | Jaejin Lee |
| collection | DOAJ |
| description | Energy spectra of electron microbursts from 170 keV to 340 keV have been measured by the solid-state detectors aboard
the low-altitude (680 km) polar-orbiting Korean STSAT-1 (Science and Technology SATellite). These measurements have
revealed two important characteristics unique to the microbursts: (1) They are produced by a fast-loss cone-filling process
in which the interaction time for pitch-angle scattering is less than 50 ms and (2) The e-folding energy of the perpendicular
component is larger than that of the parallel component, and the loss cone is not completely filled by electrons. To
understand how wave-particle interactions could generate microbursts, we performed a test particle simulation and
investigated how the waves scattered electron pitch angles within the timescale required for microburst precipitation. The
application of rising-frequency whistler-mode waves to electrons of different energies moving in a dipole magnetic field
showed that chorus magnetic wave fields, rather than electric fields, were the main cause of microburst events, which
implied that microbursts could be produced by a quasi-adiabatic process. In addition, the simulation results showed that
high-energy electrons could resonate with chorus waves at high magnetic latitudes where the loss cone was larger, which
might explain the decreased e-folding energy of precipitated microbursts compared to that of trapped electrons. |
| first_indexed | 2024-03-08T17:34:32Z |
| format | Article |
| id | doaj.art-30fb3b392b1a4409a2b8c74955229a5d |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T17:34:32Z |
| publishDate | 2015-12-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-30fb3b392b1a4409a2b8c74955229a5d2024-01-02T13:04:15ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14092015-12-0132431732510.5140/JASS.2015.32.4.317Short-duration Electron Precipitation Studied by Test Particle SimulationJaejin Lee0Kyung-Chan Kim1Jong-Gil Lee2Korea Astronomy and Space Science Institute, Daejeon 34055, KoreaKorea Astronomy and Space Science Institute, Daejeon 34055, KoreaKorea Astronomy and Space Science Institute, Daejeon 34055, KoreaEnergy spectra of electron microbursts from 170 keV to 340 keV have been measured by the solid-state detectors aboard the low-altitude (680 km) polar-orbiting Korean STSAT-1 (Science and Technology SATellite). These measurements have revealed two important characteristics unique to the microbursts: (1) They are produced by a fast-loss cone-filling process in which the interaction time for pitch-angle scattering is less than 50 ms and (2) The e-folding energy of the perpendicular component is larger than that of the parallel component, and the loss cone is not completely filled by electrons. To understand how wave-particle interactions could generate microbursts, we performed a test particle simulation and investigated how the waves scattered electron pitch angles within the timescale required for microburst precipitation. The application of rising-frequency whistler-mode waves to electrons of different energies moving in a dipole magnetic field showed that chorus magnetic wave fields, rather than electric fields, were the main cause of microburst events, which implied that microbursts could be produced by a quasi-adiabatic process. In addition, the simulation results showed that high-energy electrons could resonate with chorus waves at high magnetic latitudes where the loss cone was larger, which might explain the decreased e-folding energy of precipitated microbursts compared to that of trapped electrons.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2015/v32n4/OJOOBS_2015_v32n4_317.pdfelectron microburstwave-particle interactionelectron precipitation |
| spellingShingle | Jaejin Lee Kyung-Chan Kim Jong-Gil Lee Short-duration Electron Precipitation Studied by Test Particle Simulation Journal of Astronomy and Space Sciences electron microburst wave-particle interaction electron precipitation |
| title | Short-duration Electron Precipitation Studied by Test Particle Simulation |
| title_full | Short-duration Electron Precipitation Studied by Test Particle Simulation |
| title_fullStr | Short-duration Electron Precipitation Studied by Test Particle Simulation |
| title_full_unstemmed | Short-duration Electron Precipitation Studied by Test Particle Simulation |
| title_short | Short-duration Electron Precipitation Studied by Test Particle Simulation |
| title_sort | short duration electron precipitation studied by test particle simulation |
| topic | electron microburst wave-particle interaction electron precipitation |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2015/v32n4/OJOOBS_2015_v32n4_317.pdf |
| work_keys_str_mv | AT jaejinlee shortdurationelectronprecipitationstudiedbytestparticlesimulation AT kyungchankim shortdurationelectronprecipitationstudiedbytestparticlesimulation AT jonggillee shortdurationelectronprecipitationstudiedbytestparticlesimulation |