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Energy shortage of nonthermal electrons in powering a solar flare
Gan, WQ; Li, YP; Chang, J
AbstractWithin a deka-keV energy range, the power-law electron beams interacting with the solar atmosphere also result in the power-law bremsstrahlung of hard X-rays. The energy spectrum of electrons can thus be deduced from the observed hard X-ray spectrum, and the total energy carried by accelerated electrons can then be estimated. For quite a long time, one has always assumed the lower energy cutoff (E-c) of the power-law electron beams to be around 20 keV, an assumption that constitutes a main ingredient of the so-called standard picture of a solar flare, since the nonthermal electrons are substantial in powering a solar flare. However, there is in fact no solid observational basis for E-c = 20 keV. Here we present a quantitative method to determine E-c and its application to 14 BATSE/Compton Gamma Ray Observatory hard X-ray events. We find that E-c, varying from 47 to 141 keV in our samples, is on average 76.4 keV. The total energy carried by nonthermal electrons is therefore shown to be at least 1 order of magnitude lower than that derived by taking E-c = 20 keV. This energy shortage of nonthermal electrons in our sample hard X-ray events conflicts with the widely accepted scenario of a solar flare.
KeywordAcceleration Of Particles Sun : Flares Sun : Particle Emission Sun : X-Rays, Gamma Rays
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000169133700040
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Gan, WQ,Li, YP,Chang, J. Energy shortage of nonthermal electrons in powering a solar flare[J]. ASTROPHYSICAL JOURNAL,2001,552(2):858-862.
APA Gan, WQ,Li, YP,&Chang, J.(2001).Energy shortage of nonthermal electrons in powering a solar flare.ASTROPHYSICAL JOURNAL,552(2),858-862.
MLA Gan, WQ,et al."Energy shortage of nonthermal electrons in powering a solar flare".ASTROPHYSICAL JOURNAL 552.2(2001):858-862.
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