PMO OpenIR  > 太阳活动的多波段观测研究团组
Energetic electrons in loop top and footpoint microwave sources
Zhou, AH; Su, YN; Huang, GL
Source PublicationSOLAR PHYSICS
AbstractWe have studied two microwave events with one-loop top (LT) and two-footpoint (FP) sources observed at 17 and 34 GHz by the Nobeyama Radioheliograph (NoRH). The microwave brightness peak is located near the FPs of the flare loop for one event, but near the LT for the other event. The microwave spectra of the FP sources are considerably softer (by Delta alpha approximate to 2.0) than that of the LTs for both events. We assume that the microwave emission is gyro-synchrotron radiation from energetic electrons trapped in a magnetic dipole field and the energetic electron distribution is isotropic in pitch angle and power law. In the gyro-synchrotron calculations, the self-absorption and gyro-resonance absorption are taken into account simultaneously. The numerical calculations based on the general equation of radiative transfer show that the distributions of energetic electrons along a flare loop are highly inhomogeneous: accelerated electrons are concentrated in the FPs for both events. Even for the event with brightness maximum near the LT the electron number density of the LT source is still an order of magnitude lower than that of the FP sources. The emission peak near LT results mainly from the much harder spectral index of the energetic electrons in the LT source.
KeywordHard X-ray Solar-flares Flaring Loop Gyrosynchrotron Radiation Impulsive Phase Emission Bursts Field Configuration Polarization
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000229188200008
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Zhou, AH,Su, YN,Huang, GL. Energetic electrons in loop top and footpoint microwave sources[J]. SOLAR PHYSICS,2005,226(2):327-336.
APA Zhou, AH,Su, YN,&Huang, GL.(2005).Energetic electrons in loop top and footpoint microwave sources.SOLAR PHYSICS,226(2),327-336.
MLA Zhou, AH,et al."Energetic electrons in loop top and footpoint microwave sources".SOLAR PHYSICS 226.2(2005):327-336.
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