Hemispheric Asymmetry of Ionospheric Poynting Flux During Geomagnetically Quiet Periods

IF 2.6 2区地球科学 Q2 ASTRONOMY & ASTROPHYSICS Journal of Geophysical Research: Space Physics Pub Date : 2024-10-16 DOI:10.1029/2024JA032519

Chao Yu, Xiao-Xin Zhang, Wenbin Wang, Fei He

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Abstract

Using a large database containing DMSP F13 observations under geomagnetically quiet conditions from 1998 to 2009, the hemispheric asymmetries of the distribution of the Poynting flux were investigated. Significant hemispheric asymmetries were observed in both altitude-adjusted corrected geomagnetic (AACGM) and geographic coordinates, and the maximum average flux in the northern hemisphere was greater than that in the southern hemisphere by a factor of three in both coordinates. The distribution of downward Poynting flux hot-spot (DPFH) between the two hemispheres had longitudinal difference of ∼180°. The Poynting flux's hemispheric asymmetry in AACGM and geographical coordinates at different seasons were investigated. The observed seasonal variations in the Southern Hemisphere (SH) are not as significant as those in the Northern Hemisphere (NH). In addition, the downward net Poynting flux observed during the solstice period is greater than that observed for the equinox period above 60°S.

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地磁静止期电离层 Poynting 通量的半球不对称现象

利用包含 1998 年至 2009 年地磁静止条件下 DMSP F13 观测数据的大型数据库，对波因廷通量分布的半球非对称性进行了研究。在高度调整校正地磁（AACGM）和地理坐标上都观测到了明显的半球不对称现象，在两个坐标上，北半球的最大平均通量都比南半球大三倍。两个半球之间的向下波因廷通量热点（DPFH）分布纵向相差 ∼180°。研究了不同季节 AACGM 和地理坐标上的 Poynting 通量半球非对称性。观测到的南半球（SH）季节变化不如北半球（NH）明显。此外，在至日期间观测到的向下净波因廷通量大于在南纬 60 度以上的春分期间观测到的向下净波因廷通量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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