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The correlation between solar and geomagnetic activity - Part 1: Two-term decomposition of geomagnetic activity
Du, Z. L.
2011
Source PublicationANNALES GEOPHYSICAE
Volume29Issue:8Pages:1331-1340
AbstractBy analyzing the logarithmic relationship between geomagnetic activity as represented by the annual aa index and solar magnetic field activity as represented by the annual sunspot number (R-z) during the period 1844-2010, aa is shown to lie in between two lines defined solely by R-z. Two ways can be used to decompose the aa index into two components. One is decomposing aa into the sum of the baseline (aa(b)) and the remainder (aa(u)) with a null correlation. Another is dividing the top-line (aa(t)) into the sum of aa and the remainder (aa(d)) with a null correlation. The first decomposition is similar to the traditional one. The second decomposition implies a nonlinear relationship of aa with R-z (aa(t)) and a decay process (aa(d)). Therefore, aa(t) = aa + aa(d) = aa(b) + aa(u) + aa(d): (i) aa(t) is related to the solar energy potential of generating geomagnetic activity (associated with R-z); (ii) aa(b) is related to transient phenomena; (iii) aa(u) is related to recurrent phenomena; and (iv) aa(d) is related to the energy loss in the transmission from solar surface to the magnetosphere and ionosphere that failed to generate geomagnetic activity.
KeywordMagnetospheric Physics Solar Wind-magnetosphere Interactions
DOI10.5194/angeo-29-1331-2011
Indexed BySCI
Language英语
WOS IDWOS:000294455800001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8065
Collection太阳物理研究部
AffiliationChinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Du, Z. L.. The correlation between solar and geomagnetic activity - Part 1: Two-term decomposition of geomagnetic activity[J]. ANNALES GEOPHYSICAE,2011,29(8):1331-1340.
APA Du, Z. L..(2011).The correlation between solar and geomagnetic activity - Part 1: Two-term decomposition of geomagnetic activity.ANNALES GEOPHYSICAE,29(8),1331-1340.
MLA Du, Z. L.."The correlation between solar and geomagnetic activity - Part 1: Two-term decomposition of geomagnetic activity".ANNALES GEOPHYSICAE 29.8(2011):1331-1340.
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