KMS National Astronomical Observatories, CAS
The correlation between solar and geomagnetic activity - Part 3: An integral response model | |
Du, Z. L. | |
2011 | |
Source Publication | ANNALES GEOPHYSICAE |
Volume | 29Issue:6Pages:1005-1018 |
Abstract | An integral response model is proposed to describe the relationship between geomagnetic activity (aa index) and solar activity (represented by sunspot number R-z): The aa at a given time t is the integral of R-z at past times (t' <= t) multiplied by an exponential decay factor of the time differences (e(-(t-t')/tau)), where tau is the decay time scale (similar to 40 months). The correlation coefficient of aa with the reconstructed series based on this model (r(f) = 0.85) is much higher than that of aa with R-z (r(0) = 0.61). If this model is applied to each solar cycle, the correlation coefficient will be higher (r(f) = 0.95). This model can naturally explain some phenomena related to aa and R-z, such as (i) the significant increase in the aa index (and its baseline) over the twentieth century; (ii) the longer lag times of aa to R-z at solar cycle maxima than at minima; and (iii) the variations in the correlations related to solar and Hale cycles. These results demonstrate that aa depends not only on the present R-z but also on past values. The profile of aa can be better predicted from R-z by this model than by point-point correspondence. |
Keyword | General Or Miscellaneous Solar Physics Astrophysics And Astronomy |
DOI | 10.5194/angeo-29-1005-2011 |
Indexed By | SCI |
Language | 英语 |
WOS ID | WOS:000291945800005 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.bao.ac.cn/handle/114a11/7832 |
Collection | 太阳物理研究部 |
Affiliation | Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Activ, Beijing 100012, Peoples R China |
Recommended Citation GB/T 7714 | Du, Z. L.. The correlation between solar and geomagnetic activity - Part 3: An integral response model[J]. ANNALES GEOPHYSICAE,2011,29(6):1005-1018. |
APA | Du, Z. L..(2011).The correlation between solar and geomagnetic activity - Part 3: An integral response model.ANNALES GEOPHYSICAE,29(6),1005-1018. |
MLA | Du, Z. L.."The correlation between solar and geomagnetic activity - Part 3: An integral response model".ANNALES GEOPHYSICAE 29.6(2011):1005-1018. |
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