The effect of photoelectron interhemispheric transport on ion temperature in the topside ionosphere around sunset

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2025-04-01 DOI:10.1016/j.asr.2025.03.063

Zhenzhang Tang , Huijun Le , Libo Liu , Yiding Chen , Ruilong Zhang

引用次数: 0

Abstract

We discovered two significant ion temperature variations in the topside ionosphere around sunset. There is a cooling before sunset and a slow drop after sunset. We speculate that these variations are closely linked to the transport and heating of photoelectrons that move between hemispheres. This movement of photoelectrons is influenced by two factors: the length of the magnetic field line (LMF) and the angle between the horizontal projection of the magnetic field line and the sunset line (AMFS). Our quantitative analysis has revealed that an increase in AMFS encourages photoelectron transport, whereas an increase in LMF hinders it. Additionally, we have determined that the area of maximum cooling before sunset aligns with the predawn heating, while the slow drop after sunset occurs in lower magnetic latitude. In regions where AMFS is less than 10°, the transport of photoelectrons does not play a major role in influencing ion temperature.

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日落前后光电子半球间输运对顶层电离层离子温度的影响

我们发现在太阳落山时，上层电离层有两个显著的离子温度变化。日落前有降温，日落后有缓慢下降。我们推测这些变化与在半球之间移动的光电子的传输和加热密切相关。光电子的这种运动受两个因素的影响：磁力线（LMF）的长度和磁力线的水平投影与日落线（AMFS）之间的角度。我们的定量分析表明，AMFS的增加促进了光电子传递，而LMF的增加则阻碍了它。此外，我们已经确定日落前最大的冷却区域与黎明前的加热一致，而日落后缓慢下降发生在较低的磁纬。在AMFS小于10°的区域，光电子输运对离子温度的影响不大。

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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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.