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Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect
Li, You-Ping; Gan, Wei-Qun; Su, Yang
2009-10-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume9Issue:10Pages:1155-1164
AbstractAmong the RHESSI flare samples, we concentrated on a kind of flare that presents two successive peaks (that is, it presents both an impulsive phase and a gradual phase) in 12 - 25 keV light curves. Taking the CIA flare on 2002 August 12 as an example, we studied the light curves, spectra, and images in detail. Making full use of the capabilities of RHESSI, we showed some evidence to support the expected causal relationship between these two peaks: the first peak is mainly nonthermal, while the second peak is mainly thermal; the energy carried by nonthermal electrons during the first peak seems to be comparable to the thermal energy of the second peak. The morphologies of X-ray images and their evolutions provide additional evidence for this causality. We conclude that two such peaks in the 12 - 25 keV light curve are good evidence for the chromospheric evaporation. However, the maximum time of the second peak is later than the end time of the first peak, suggesting that for some events, a modification of the traditional Neupert effect could be necessary by inclusion of a time delay, which might be partly related to the filling of the loop by evaporated material.
KeywordSun: Flares Sun: X-rays, Gamma-rays
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordSOLAR-FLARES ; NONTHERMAL ELECTRONS ; IMPULSIVE PHASE ; TOTAL-ENERGY ; LOOP ; DISTRIBUTIONS ; ENERGETICS ; SPECTRA ; EVENTS ; MODEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000271266300007
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/1509
Collection太阳高能及相关物理过程研究团组
AffiliationChinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Li, You-Ping,Gan, Wei-Qun,Su, Yang. Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(10):1155-1164.
APA Li, You-Ping,Gan, Wei-Qun,&Su, Yang.(2009).Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(10),1155-1164.
MLA Li, You-Ping,et al."Double hard X-ray peaks in RHESSI flares as evidence of chromospheric evaporation and implications for modifying the Neupert effect".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.10(2009):1155-1164.
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