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Does the F-10.7 index correctly describe solar EUV flux during the deep solar minimum of 2007-2009?
Chen, Yiding; Liu, Libo; Wan, Weixing; Chen, YD (reprint author), Chinese Acad Sci, Beijing Natl Observ Space Environm, Inst Geol & Geophys, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2011
Volume116Pages:A04304
ISSN2169-9380
Language英语
AbstractThis paper shows that the relationship between solar EUV flux and the F-10.7 index during the extended solar minimum (Smin) of 2007-2009 is different from that in the previous Smin. This difference is also seen in the relationship between f(o)F(2) and F-10.7. We collected SOHO/SEM EUV observations and the F-10.7 index, through June 2010, to investigate solar irradiance in the recent Smin. We find that, owing to F-10.7 and solar EUV flux decreased from the last Smin to the recent one with different amplitudes (larger in EUV flux), EUV flux is significantly lower in the recent Smin than in the last one for the same F-10.7. Namely, F-10.7 does not describe solar EUV irradiance in the recent Smin as it did in the last Smin. That caused remarkable responses in ionospheric f(o)F(2). For the same F-10.7, f(o)F(2) in the recent Smin is lower than that in the last one; further, it is also lower than that in other previous Smins. Therefore, F-10.7 is not an ideal indicator of f(o)F(2) during the recent Smin, which implies that F-10.7 is not an ideal proxy for solar EUV irradiance during this period, although it has been adequate during previous Smins. Solar irradiance models and ionospheric models will need to take this into account for solar cycle investigations.; This paper shows that the relationship between solar EUV flux and the F-10.7 index during the extended solar minimum (Smin) of 2007-2009 is different from that in the previous Smin. This difference is also seen in the relationship between f(o)F(2) and F-10.7. We collected SOHO/SEM EUV observations and the F-10.7 index, through June 2010, to investigate solar irradiance in the recent Smin. We find that, owing to F-10.7 and solar EUV flux decreased from the last Smin to the recent one with different amplitudes (larger in EUV flux), EUV flux is significantly lower in the recent Smin than in the last one for the same F-10.7. Namely, F-10.7 does not describe solar EUV irradiance in the recent Smin as it did in the last Smin. That caused remarkable responses in ionospheric f(o)F(2). For the same F-10.7, f(o)F(2) in the recent Smin is lower than that in the last one; further, it is also lower than that in other previous Smins. Therefore, F-10.7 is not an ideal indicator of f(o)F(2) during the recent Smin, which implies that F-10.7 is not an ideal proxy for solar EUV irradiance during this period, although it has been adequate during previous Smins. Solar irradiance models and ionospheric models will need to take this into account for solar cycle investigations.
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/122/3312
Collection空间科学部
Corresponding AuthorChen, YD (reprint author), Chinese Acad Sci, Beijing Natl Observ Space Environm, Inst Geol & Geophys, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China.
Recommended Citation
GB/T 7714
Chen, Yiding,Liu, Libo,Wan, Weixing,et al. Does the F-10.7 index correctly describe solar EUV flux during the deep solar minimum of 2007-2009?[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A04304.
APA Chen, Yiding,Liu, Libo,Wan, Weixing,&Chen, YD .(2011).Does the F-10.7 index correctly describe solar EUV flux during the deep solar minimum of 2007-2009?.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A04304.
MLA Chen, Yiding,et al."Does the F-10.7 index correctly describe solar EUV flux during the deep solar minimum of 2007-2009?".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A04304.
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