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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국우주과학회 Journal of Astronomy and Space Sciences Journal of Astronomy and Space Sciences 제32권 제4호
- 발행연도
- 2015.12
- 수록면
- 317 - 325 (9page)
- DOI
- http://dx.doi.org/10.5140/JASS.2015.32.3.189
이용수
초록· 키워드
오류제보하기
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.
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참고문헌 (31)
참고문헌 신청
J. M. Albert / 2005 / Evaluation of quasi-linear diffusion coefficients for whistler mode waves in a plasma with arbitrary density ratio / Journal of Geophysical Research 110(A3)
K. A. Anderson / 1964 / Balloon observations of X rays in the auroral zone: 3. High time resolution studies / Journal of Geophysical Research 69(21):4457~4479
K. A. Anderson / 1966 / Balloon and rocket observations of auroral-zone microbursts / Journal of Geophysical Research 71(19):4617~4629
T. F. Bell / 1984 / The nonlinear gyroresonance interaction between energetic electrons and coherent VLF waves propagating at an arbitrary angle with respect to the Earth's magnetic field / Journal of Geophysical Research 89(A2):905
J. Bortnik / 2007 / The dual role of ELF/VLF chorus waves in the acceleration and precipitation of radiation belt electrons / Journal of Atmospheric and Solar-Terrestrial Physics 69(3):378~386
K. A. Anderson / 1964 / Balloon observations of X rays in the auroral zone: 3. High time resolution studies / Journal of Geophysical Research 69(21):4457~4479
K. A. Anderson / 1966 / Balloon and rocket observations of auroral-zone microbursts / Journal of Geophysical Research 71(19):4617~4629
T. F. Bell / 1984 / The nonlinear gyroresonance interaction between energetic electrons and coherent VLF waves propagating at an arbitrary angle with respect to the Earth's magnetic field / Journal of Geophysical Research 89(A2):905
J. Bortnik / 2007 / The dual role of ELF/VLF chorus waves in the acceleration and precipitation of radiation belt electrons / Journal of Atmospheric and Solar-Terrestrial Physics 69(3):378~386
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