午后极光强度与太阳风-磁层耦合函数的相关

利用1997年和1998年南极中山站多通道扫描光度计的地面观测数据和Wind卫星在弓激波上游对行星际磁场和太阳风参数的观测数据,对午后高纬极光强度与太阳风-磁层耦合函数之间的相关性进行定量研究.研究表明,午后630.0nm极光强度与太阳风-磁层耦合函数间有很好的相关,而557.7nm的相关性差一些;在考察的所有耦合函数中,午后极光受太阳风电场和能量的影响更直接;同时,行星际磁场的时钟角对午后极光也有很强的控制作用. 

Dependences of Postnoon Auroral Intensity on Solar Wind-Magnetosphere Coupling Functions

Using auroral observations at Zhongshan Station, Antarctica with a multi-channels scanning photometer, and Interplanetary Magnetic Field (IMF) and solar wind parameters observed by Wind Satellite at the upstream of the bow shock in 1997 and 1998, the dependences of the high-latitude postnoon auroral intensity upon solar wind-magnetosphere coupling functions are studied quantificationally. It shows that the intensity of the postnoon 630 nm emission is highly dependent on the solar wind electric field and the solar wind energy density flux, the postnoon auroral emission has larger correlation coefficients with the solar wind electric field functions than with the solar wind energy density flux functions, which is consistent with Liou's result derived from images acquired by the ultraviolet imager on board Polar satellite. The dependences of 630 nm emission on the different solar wind electric field functions related to the clock angle are varied, which implies that the clock angle of the interplanetary field is also a very important factor on postnoon aurora. The dependences of the postnoon auroral emission on solar wind-magnetosphere coupling functions and trans-polar potential functions are also studied. The intensity of the 630 nm emission depends on these functions more directly than that of the 557.7 nm emission.