当前位置: X-MOL 学术J. Geophys. Res. Space Phys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of Nonmigrating Tides and Geomagnetic Field Geometry on the Diurnal and Longitudinal Variations of the Equatorial Electrojet
Journal of Geophysical Research: Space Physics ( IF 2.8 ) Pub Date : 2020-05-23 , DOI: 10.1029/2019ja027631
Hui Wang 1 , Zhichao Zheng 1 , Kedeng Zhang 1 , Wenbin Wang 2
Affiliation  

In this study, equatorial electrojets (EEJs) simulated by the Thermosphere‐Ionosphere Electrodynamics General Circulation Model (TIE‐GCM) were compared with those observed by ground‐based magnetometers and the Challenging Minisatellite Payload (CHAMP) satellite. Simulations were performed with or without nonmigrating tidal forcing at the lower boundary and in the frame of the International Geomagnetic Reference Field (IGRF) or dipole field. The model forced by the nonmigrating tides could qualitatively reproduce the local time and longitudinal variation of an EEJ in the frame of the IGRF with accuracy. The tides were important in causing the later local time occurrence of the EEJ peak in the Peruvian sector, and they favored the occurrence of the morning counterelectrojet (CEJ) in the frame of the IGRF. The difference in the EEJ peak intensity between the Peruvian and Indian stations was enhanced due to the tidal effect. The net effect of the tides on the two‐station difference was almost doubled in the dipole field compared with that in the IGRF. The TIE‐GCM with a tidal input could reproduce a Wavenumber‐4 longitudinal structure of the noontime EEJ, but it underestimated the peak EEJ in the East Asia sector. The magnetically eastward electric field and the neutral zonal wind at noontime in the E region in the TIE‐GCM were both weak in the East Asia sector. This model‐data discrepancy was at least partly due to insufficient lower boundary forcing in this longitudinal sector.

中文翻译:

非迁徙潮汐和地磁场的几何形状对赤道电喷的昼夜变化的影响

在这项研究中,将热球-电离层电动力学通用循环模型(TIE-GCM)模拟的赤道电喷(EEJs)与地面磁力计和具有挑战性的微型卫星有效载荷(CHAMP)卫星观测到的进行了比较。在下边界和国际地磁参考场(IGRF)或偶极场的框架内,在有或没有潮汐强迫作用下进行了模拟。由非迁徙潮汐推动的模型可以在IGRF框架内定性地精确再现EEJ的局部时间和纵向变化。这些潮汐对在秘鲁地区造成EEJ高峰在当地时间的后期产生很重要,并且它们有利于在IGRF框架内出现早晨反电喷(CEJ)。由于潮汐效应,秘鲁和印度站之间的EEJ峰值强度差异有所增加。与IGRF相比,在偶极场中,潮汐对两站差异的净影响几乎翻倍。带有潮汐输入的TIE-GCM可以重现中午EEJ的Wavenumber-4纵向结构,但它低估了东亚地区的EEJ高峰。中午时的磁场东向电场和中性纬向风。但它低估了东亚地区的EEJ高峰。中午时的磁场东向电场和中性纬向风。但它低估了东亚地区的EEJ高峰。中午时的磁场东向电场和中性纬向风。TIE-GCM的E区在东亚地区均疲软。模型数据的差异至少部分是由于该纵向扇区的下边界强迫不足。
更新日期:2020-05-23
down
wechat
bug