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

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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]
Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Label: Title
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  Data: The effect of photoelectron interhemispheric transport on ion temperature in the topside ionosphere around sunset.
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  Data: <searchLink fieldCode="AR" term="%22Tang%2C+Zhenzhang%22">Tang, Zhenzhang</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Le%2C+Huijun%22">Le, Huijun</searchLink><relatesTo>1,2,3,4</relatesTo> (AUTHOR)<i> lehj@mail.iggcas.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Libo%22">Liu, Libo</searchLink><relatesTo>1,2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Yiding%22">Chen, Yiding</searchLink><relatesTo>1,2,3,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Ruilong%22">Zhang, Ruilong</searchLink><relatesTo>1,2,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Advances+in+Space+Research%22">Advances in Space Research</searchLink>. Jun2025, Vol. 75 Issue 11, p8262-8269. 8p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Electron+cloud+effect%22">Electron cloud effect</searchLink><br /><searchLink fieldCode="DE" term="%22Transport+theory%22">Transport theory</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+temperature%22">Ion temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Photoelectrons%22">Photoelectrons</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.asr.2025.03.063
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 8262
    Subjects:
      – SubjectFull: Electron cloud effect
        Type: general
      – SubjectFull: Transport theory
        Type: general
      – SubjectFull: Ion temperature
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
      – SubjectFull: Photoelectrons
        Type: general
    Titles:
      – TitleFull: The effect of photoelectron interhemispheric transport on ion temperature in the topside ionosphere around sunset.
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            NameFull: Tang, Zhenzhang
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            NameFull: Le, Huijun
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            NameFull: Liu, Libo
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            NameFull: Chen, Yiding
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            NameFull: Zhang, Ruilong
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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