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Statistical Studies on the Excess Peak Flux in Soft X-rays and EUV Bands from Solar Flares
Zhang, D. H.; Cai, L.; Ercha, A.; Hao, Y. Q.; Xiao, Z.; Zhang, DH (reprint author), Peking Univ, Dept Geophys, Beijing 100871, Peoples R China.
Department空间科学部
Source PublicationSOLAR PHYSICS
2012
Volume280Issue:1Pages:183-196
ISSN0038-0938
Language英语
KeywordEuv Flare Irradiance Sem X-rays
AbstractBased on the solar X-ray data in the band of 0.1 -aEuro parts per thousand 0.8 nm observed by Geostationary Operational Environmental Satellites (GOES), the XUV and EUV data in the bands of 26 -aEuro parts per thousand 34 nm and 0.1 -aEuro parts per thousand 50 nm observed by the Solar EUV Monitor (SEM) onboard the Solar and Heliospheric Observatory (SOHO), a statistical analysis on the excess peak flux (the pre-flare flux is subtracted) in two SEM bands during M- and X-class flares from 1998 to 2007 is given. The average ratio of the excess peak flux to the pre-flare flux for the M-class flares is 5.5 %+/- 3.7 % and that for the X-class flares is 16 %+/- 11 %. The excess peak fluxes in two SEM bands are positively correlated with the X-ray flare class; with the increase in the X-ray flare class, the excess peak flux in two SEM bands increases. However, a large dispersion in the excess peak flux in the SEM bands and their ratio is found for the same X-ray flare class. The relationship between the excess peak fluxes of the two SEM bands also shows large dispersion. It is considered that the diversity we found in the flare spectral irradiance is caused by many variable factors related to the structure and evolution of solar flares.; Based on the solar X-ray data in the band of 0.1 -aEuro parts per thousand 0.8 nm observed by Geostationary Operational Environmental Satellites (GOES), the XUV and EUV data in the bands of 26 -aEuro parts per thousand 34 nm and 0.1 -aEuro parts per thousand 50 nm observed by the Solar EUV Monitor (SEM) onboard the Solar and Heliospheric Observatory (SOHO), a statistical analysis on the excess peak flux (the pre-flare flux is subtracted) in two SEM bands during M- and X-class flares from 1998 to 2007 is given. The average ratio of the excess peak flux to the pre-flare flux for the M-class flares is 5.5 %+/- 3.7 % and that for the X-class flares is 16 %+/- 11 %. The excess peak fluxes in two SEM bands are positively correlated with the X-ray flare class; with the increase in the X-ray flare class, the excess peak flux in two SEM bands increases. However, a large dispersion in the excess peak flux in the SEM bands and their ratio is found for the same X-ray flare class. The relationship between the excess peak fluxes of the two SEM bands also shows large dispersion. It is considered that the diversity we found in the flare spectral irradiance is caused by many variable factors related to the structure and evolution of solar flares.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3093
Collection空间科学部
Corresponding AuthorZhang, DH (reprint author), Peking Univ, Dept Geophys, Beijing 100871, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, D. H.,Cai, L.,Ercha, A.,et al. Statistical Studies on the Excess Peak Flux in Soft X-rays and EUV Bands from Solar Flares[J]. SOLAR PHYSICS,2012,280(1):183-196.
APA Zhang, D. H.,Cai, L.,Ercha, A.,Hao, Y. Q.,Xiao, Z.,&Zhang, DH .(2012).Statistical Studies on the Excess Peak Flux in Soft X-rays and EUV Bands from Solar Flares.SOLAR PHYSICS,280(1),183-196.
MLA Zhang, D. H.,et al."Statistical Studies on the Excess Peak Flux in Soft X-rays and EUV Bands from Solar Flares".SOLAR PHYSICS 280.1(2012):183-196.
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