Variations of solar, interplanetary, and geomagnetic parameters with solar magnetic multipole fields during Solar Cycles 21-24

被引:2
|
作者
Kim, Bogyeong [1 ]
Lee, Jeongwoo [1 ,2 ]
Yi, Yu [1 ]
Oh, Suyeon [3 ]
机构
[1] Chonnam Natl Univ, Dept Astron Space Sci & Geol, Kwangju, South Korea
[2] New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA
[3] Chonnam Natl Univ, Dept Earth Sci Educ, Kwangju, South Korea
基金
新加坡国家研究基金会;
关键词
Solar Cycle; Solar magnetic field; Interplanetary magnetic field; Geomagnetic field; Cosmic ray; MODEL;
D O I
10.1016/j.asr.2014.09.026
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
In this study we compare the temporal variations of the solar, interplanetary, and geomagnetic (SIG) parameters with that of open solar magnetic flux from 1976 to 2012 (from Solar Cycle 21 to the early phase of Cycle 24) for a purpose of identifying their possible relationships. By the open flux, we mean the average magnetic field over the source surface (2.5 solar radii) times the source area as defined by the potential field source surface (PFSS) model of the Wilcox Solar Observatory (WSO). In our result, most SIG parameters except the solar wind dynamic pressure show rather poor correlations with the open solar magnetic field. Good correlations are recovered when the contributions from individual multipole components are counted separately. As expected, solar activity indices such as sunspot number, total solar irradiance, 10.7 cm radio flux, and solar flare occurrence are highly correlated with the flux of magnetic quadrupole component. The dynamic pressure of solar wind is strongly correlated with the dipole flux, which is in anti-phase with Solar Cycle (SC). The geomagnetic activity represented by the Ap index is correlated with higher order multipole components, which show relatively a slow time variation with SC. We also found that the unusually low geomagnetic activity during SC 23 is accompanied by the weak open solar fields compared with those in other SCs. It is argued that such dependences of the SIG parameters on the individual multipole components of the open solar magnetic flux may clarify why some SIG parameters vary in phase with SC and others show seemingly delayed responses to SC variation. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:401 / 406
页数:6
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