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  Field‐Aligned Currents in the Magnetosphere–Ionosphere

Lühr, H., Kervalishvili, G. (2021): Field‐Aligned Currents in the Magnetosphere–Ionosphere. - In: Maggiolo, R., André, N., Hasegawa, H., Welling, D. T., Zhang, Y., Paxton, L. J. (Eds.), Magnetospheres in the Solar System, (Geophysical Monograph Series ; 259), Wiley, 193-205.
https://doi.org/10.1002/9781119815624.ch13

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006663 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006663_1
Genre: Book Chapter

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 Creators:
Lühr, H.1, Author              
Kervalishvili, G.1, Author              
Affiliations:
12.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146030              

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Free keywords: climatological features; current density; field‐aligned currents; magnetized plasmas; magnetosphere‐ionosphere; near‐Earth space
 Abstract: Field‐aligned currents play a major role in magnetized plasmas. They are the main agents for coupling the dynamics between magnetosphere and ionosphere. Perturbations of magnetic field distribution, plasma pressure or flow on one end are communicated by field‐aligned currents along the whole flux tube. Furthermore, they transport energy, practically lossless, from dynamo regions in the magnetosphere into the upper atmosphere. The knowledge of field‐aligned current distribution is therefore of great interest for understanding the magnetosphere‐ionosphere system. In this chapter we describe the expressions that illustrate the relationship between plasma motion in the magnetosphere and electric currents flowing along the background magnetic field. These currents can only be sensed above the ionospheric E‐layer, e.g. by low‐Earth orbiting satellites. However, to obtain reliable current density estimates is quite challenging. In a climatological sense, field‐aligned currents appear along two concentric rings in the high‐latitude ionosphere with opposite flow directions. Details of these patterns are controlled by the orientation of the interplanetary magnetic field. The transverse scale sizes determine important characteristics of field‐aligned currents.

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Language(s): eng - English
 Dates: 2021-05-072021-04-23
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: GFZPOF: p4 T1 Atmosphere
DOI: 10.1002/9781119815624.ch13
 Degree: -

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Title: Magnetospheres in the Solar System
Source Genre: Book
 Creator(s):
Maggiolo, Romain1, Editor
André, Nicolas1, Editor
Hasegawa, Hiroshi1, Editor
Welling, Daniel T.1, Editor
Zhang, Yongliang1, Editor
Paxton, Larry J.1, Editor
Affiliations:
1 External Organizations, ou_persistent22            
Publ. Info: Wiley
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 193 - 205 Identifier: ISBN: 9781119815624
ISBN: 9781119507529

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Title: Geophysical Monograph Series
Source Genre: Series
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Publ. Info: -
Pages: - Volume / Issue: 259 Sequence Number: - Start / End Page: - Identifier: -