Solar cycle dependence of the seasonal variation of auroral hemispheric power  

作　　者：ZHENG Ling FU SuiYan ZONG QuiGang PARKS George WANG Chi CHEN Xi 

机构地区：[1]School of Earth and Space Sciences, Peking University [2]Space Sciences Laboratory, UC Berkeley [3]State Key Laboratory of Space Weather, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第4期525-530,共6页

基　　金：supported by Ocean Public Welfare Scientific Research Project, State Oceanic Administration People’s Republic of China (201005017);the National Basic Research Program of China(2011CB811404)

摘　　要：Although much has been done on the hemispheric asymmetry (or seasonal variations) of auroral hemispheric power (HP), the dependence of HP hemispheric asymmetry on solar cycle has not yet been studied. We have analyzed data during 1979-2010 and investigated the dependence of HP hemispheric asymmetry/seasonal variation for the whole solar cycle. Here we show that (1) the hemispheric asymmetry of HP is positively correlated to the value of solar F10.7 with some time delay; (2) it is closely related to the coupling function between the solar wind and magnetosphere; and (3) the winter hemisphere receives more auroral power than the summer hemisphere for Kp ~0 to 6. The statistic results can be partly understood in the framework of the ionospheric conductivity feedback model. The similarity and differences between our results and previous results are discussed in the paper.Although much has been done on the hemispheric asymmetry （or seasonal variations） of auroral hemispheric power （HP）, the dependence of HP hemispheric asymmetry on solar cycle has not yet been studied. We have analyzed data during 1979-2010 and investigated the dependence of HP hemispheric asymmetry/seasonal variation for the whole solar cycle. Here we show that （1） the hemispheric asymmetry of HP is positively correlated to the value of solar F10.7 with some time delay; （2） it is closely related to the coupling function between the solar wind and magnetosphere; and （3） the winter hemisphere receives more auroral power than the summer hemisphere for Kp ~0 to 6. The statistic results can be partly understood in the framework of the ionospheric conduc- tivity feedback model. The similarity and differences between our results and previous results are discussed in the paper.

关 键 词：太阳活动周期 季节变化 功率比 半球 极光 不对称性 耦合作用 模型框架 

分 类 号：P353[天文地球—空间物理学]