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  Archimedean spiral distribution of electrons in the inner magnetosphere and its formation associated with steady convection and plasma-sheet injections

Yang, J., Sun, W., Wang, W., Cui, J., Toffoletto, F. (2023): Archimedean spiral distribution of electrons in the inner magnetosphere and its formation associated with steady convection and plasma-sheet injections, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0978

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016508 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016508_1
Genre: Conference Paper

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 Creators:
Yang, Jian1, Author
Sun, Weiqin1, Author
Wang, Wenrui1, Author
Cui, Jun1, Author
Toffoletto, Frank1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: We present an analytic theory to demonstrate that electrons with an initially asymmetric spatial distribution can form an Archimedean spiral distribution in Earth’s inner magnetosphere. Such evolution is a result of the gradient/curvature drift, whose angular velocity decreases with radial distance. It has been known for a long time that spectrograms of energetic electrons in Earth's inner radiation belt exhibit time-varying organized peaks and valleys, which are referred to as “zebra stripes”. Our theory can predict zebra stripes accurately. We also use the Rice Convection Model (RCM) to simulate zebra stripes. For the simplest situation with the dipolar magnetic field model, the analytic theory perfectly agrees with the RCM simulation. In a more realistic simulation, the RCM reproduces the time-dependent structures and evolution of the zebra stripes, which are in good consistency with Van Allen Probes observations. We will also discuss how the substorm injections may play a role in the formation of Archimedean spiral distribution and zebra stripe spectrograms.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-0978
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -