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Statistical features of the global polarity reversal of the Venusian induced magnetosphere in response to the polarity change in interplanetary magnetic field
Swedish Inst Space Phys, Kiruna, Sweden..
Swedish Inst Space Phys, Kiruna, Sweden..
Swedish Inst Space Phys, Kiruna, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 5, 3951-3962 p.Article in journal (Refereed) PublishedText
Abstract [en]

In this study we present the first statistical analysis on the effects of heliospheric current sheet crossings on the induced magnetosphere of Venus. These events are of particular interest because they lead to the reconfiguration of the induced magnetosphere with opposite polarity. We use a statistical approach based on 117 orbit pairs, and we study the spatial distribution of the heavy ion flux measurements in the plasma environment of Venus. The average and median heavy ion flux measurements are compared before and after the polarity reversal events. The results show that after the events the average and median heavy ion fluxes in the magnetotail are reduced by the factors of 0.750.09 and 0.52, respectively. We find that even if a passage of a current sheet is a short time scale event lasting about 10min, its effect on the near-Venus plasma environment lasts for a few hours. We conclude that the observations show similarities to the previous comet studies and the polarity reversal of the induced magnetosphere might be accompanied with dayside reconnection and magnetic disconnection of the plasma tail from the planetary ionosphere.

Place, publisher, year, edition, pages
2016. Vol. 121, no 5, 3951-3962 p.
Keyword [en]
Venus, tail disconnection, particle acceleration, heliospheric current sheet, space weather, induced magnetosphere
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-300973DOI: 10.1002/2015JA021995ISI: 000380025500006OAI: oai:DiVA.org:uu-300973DiVA: diva2:953470
Available from: 2016-08-17 Created: 2016-08-16 Last updated: 2016-08-17Bibliographically approved

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Edberg, Niklas J. T.
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Swedish Institute of Space Physics, Uppsala Division
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Journal of Geophysical Research - Space Physics
Astronomy, Astrophysics and Cosmology

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