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

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Bibliographic Details
Title: The effect of photoelectron interhemispheric transport on ion temperature in the topside ionosphere around sunset.
Authors: Tang, Zhenzhang1,2,3 (AUTHOR), Le, Huijun1,2,3,4 (AUTHOR) lehj@mail.iggcas.ac.cn, Liu, Libo1,2,3,4 (AUTHOR), Chen, Yiding1,2,3,5 (AUTHOR), Zhang, Ruilong1,2,4 (AUTHOR)
Source: Advances in Space Research. Jun2025, Vol. 75 Issue 11, p8262-8269. 8p.
Subjects: Electron cloud effect, Transport theory, Ion temperature, Magnetic fields, Photoelectrons
Abstract: • Two phenomena caused by photoelectron transport between the conjugate hemispheres around sunset are proposed. • The effects of photoelectron transport on both phenomena are quantitatively investigated through 2 key factors. • The regions of maximum effect for cooling before sunset and slow drop after sunset are clearly indicated. 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Two phenomena caused by photoelectron transport between the conjugate hemispheres around sunset are proposed. • The effects of photoelectron transport on both phenomena are quantitatively investigated through 2 key factors. • The regions of maximum effect for cooling before sunset and slow drop after sunset are clearly indicated. 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. [ABSTRACT FROM AUTHOR]
ISSN:02731177
DOI:10.1016/j.asr.2025.03.063