NSSC OpenIR  > 空间科学部
Statistical analysis of solar EUV and X-ray flux enhancements induced by solar flares and its implication to upper atmosphere
Le, Huijun; Liu, Libo; He, Han; Wan, Weixing; Le, HJ (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100029, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2011
Volume116Pages:A11301
ISSN2169-9380
Language英语
AbstractThe 0.1-0.8 nm X-ray flux data and 26-34 nm EUV flux data are used to statistically analyze the relationship between enhancement in X-ray flux and that in EUV flux during solar flares in 1996-2006. The EUV enhancement does not linearly increase with X-ray flux from C-class to X-class flares. Its uprising amplitude decreases with X-ray flux. The correlation coefficients between enhancements in EUV and X-ray flux for X, M and C-class flares are only 0.66, 0.58 and 0.54, respectively, which suggests that X-ray flux is not a good index for EUV flux during solar flares. Thus, for studying more accurately solar flare effect on the ionosphere/thermosphere system, one needs to use directly EUV flux measurements. One of important reasons for depressing relationship between X-ray and EUV is that the central meridian distance (CMD) of flare location can significantly affect EUV flux variation particularly for X-class flares: the larger value of CMD results in the smaller EUV enhancement. However, there are much smaller CMD effects on EUV enhancement for M and C-class flares. The solar disc images from SOHO/EIT are utilized to estimate the percentage contribution to total EUV enhancement from the flare region and from other region. The results show the larger percentage contribution from other region for the weaker flares, which would reduce the loss of EUV radiation due to limb location of flare and then weaken the CMD effect for weaker flares like M and C-class.; The 0.1-0.8 nm X-ray flux data and 26-34 nm EUV flux data are used to statistically analyze the relationship between enhancement in X-ray flux and that in EUV flux during solar flares in 1996-2006. The EUV enhancement does not linearly increase with X-ray flux from C-class to X-class flares. Its uprising amplitude decreases with X-ray flux. The correlation coefficients between enhancements in EUV and X-ray flux for X, M and C-class flares are only 0.66, 0.58 and 0.54, respectively, which suggests that X-ray flux is not a good index for EUV flux during solar flares. Thus, for studying more accurately solar flare effect on the ionosphere/thermosphere system, one needs to use directly EUV flux measurements. One of important reasons for depressing relationship between X-ray and EUV is that the central meridian distance (CMD) of flare location can significantly affect EUV flux variation particularly for X-class flares: the larger value of CMD results in the smaller EUV enhancement. However, there are much smaller CMD effects on EUV enhancement for M and C-class flares. The solar disc images from SOHO/EIT are utilized to estimate the percentage contribution to total EUV enhancement from the flare region and from other region. The results show the larger percentage contribution from other region for the weaker flares, which would reduce the loss of EUV radiation due to limb location of flare and then weaken the CMD effect for weaker flares like M and C-class.
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/122/3239
Collection空间科学部
Corresponding AuthorLe, HJ (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100029, Peoples R China.
Recommended Citation
GB/T 7714
Le, Huijun,Liu, Libo,He, Han,et al. Statistical analysis of solar EUV and X-ray flux enhancements induced by solar flares and its implication to upper atmosphere[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A11301.
APA Le, Huijun,Liu, Libo,He, Han,Wan, Weixing,&Le, HJ .(2011).Statistical analysis of solar EUV and X-ray flux enhancements induced by solar flares and its implication to upper atmosphere.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A11301.
MLA Le, Huijun,et al."Statistical analysis of solar EUV and X-ray flux enhancements induced by solar flares and its implication to upper atmosphere".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A11301.
Files in This Item: Download All
File Name/Size DocType Version Access License
2011116A11301.pdf(2043KB) 开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Le, Huijun]'s Articles
[Liu, Libo]'s Articles
[He, Han]'s Articles
Baidu academic
Similar articles in Baidu academic
[Le, Huijun]'s Articles
[Liu, Libo]'s Articles
[He, Han]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Le, Huijun]'s Articles
[Liu, Libo]'s Articles
[He, Han]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2011116A11301.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.