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  On the horizontal currents over the Martian magnetic cusp

AlMutawa, S. A., Majeed, T., AlAryani, O., Bougher, S., Withers, P., Haider, S. A., Morschhauser, A. (2021): On the horizontal currents over the Martian magnetic cusp. - Advances in Space Research, 68, 8, 3218-3224.
https://doi.org/10.1016/j.asr.2021.06.005

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007643 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007643_1
Genre: Journal Article

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 Creators:
AlMutawa, Shahd A.1, Author
Majeed, Tariq1, Author
AlAryani, Omar1, Author
Bougher, Stephen.W.1, Author
Withers, Paul1, Author
Haider, Syed A.1, Author
Morschhauser, Achim2, Author              
Affiliations:
1External Organizations, ou_persistent22              
22.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146030              

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 Abstract: Localized crustal magnetization over heavily cratered southern hemisphere at Mars gives rise to open magnetic field configurations which interact with the solar wind magnetic field to form magnetic cusp. The downward acceleration of energetic electrons in these cusps can produce aurora and an extended topside ionospheric structure over regions of magnetic anomalies. We report plasma collisions with the neutral atmosphere at one of the Martian cusps located at 82oS and 180oE, where the crustal field is strong with a radial component ~35° from the local zenith. We find that the dynamo region in the upper ionosphere of Mars is located between altitudes of 102 km and 210 km. The electrons in this region are constrained to gyrate along magnetic field lines while ions are dragged by neutrals and move along the direction of applied force. In the absence of the electric field, the horizontal current in the Martian dynamo is generated by the differential motion of ions and electrons. We find that the bulk of the current density is equatorward and confined within the Martian dynamo near the ionospheric peak with a magnitude of ~3.5 µA/m2. We also find that the eastward current density of magnitude ~0.4 µA/m2 peaking near the upper boundary of the Martian dynamo is generated by magnetized ions in the F × B direction.

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Language(s): eng - English
 Dates: 2021-06-112021
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.asr.2021.06.005
GFZPOF: p4 T3 Restless Earth
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Title: Advances in Space Research
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 68 (8) Sequence Number: - Start / End Page: 3218 - 3224 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals13
Publisher: Elsevier