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Transport of cold ions from the polar ionosphere to the plasma sheet
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2013 (English)In: Journal of Geophysical Research: Space Physics, ISSN 2169-9380, Vol. 118, no 9, 5467-5477 p.Article in journal (Refereed) Published
Abstract [en]

Ionospheric outflow is believed to be a significant contribution to the magnetospheric plasma population. Ions are extracted from the ionosphere and transported downtail by the large-scale convection motion driven by dayside reconnection. In this paper, we use a comprehensive data set of cold ion (total energy less than 70 eV) measurements combined with simultaneous observations from the solar wind to investigate the fate of these ions. By tracing the trajectories of the ions, we are able to find out where in the magnetotail ions end up. By sorting the observation according to geomagnetic activity and solar wind parameters, we then generate maps of the fate regions in the magnetotail and investigate the effects of these drivers. Our results suggest that, on overall, for about 85% of the cases, the outflowing ions are transported to the plasma sheet. The region where the ions are deposited into the plasma sheet is larger during geomagnetic quiet time than during disturbed conditions. A persistent dawn-dusk asymmetry in the plasma sheet deposition is also observed.

Place, publisher, year, edition, pages
2013. Vol. 118, no 9, 5467-5477 p.
Keyword [en]
cold ion outflow, magnetotail, plasma sheet, polar ionosphere
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-210733DOI: 10.1002/jgra.50518ISI: 000325483800008OAI: oai:DiVA.org:uu-210733DiVA: diva2:664303
Available from: 2013-11-14 Created: 2013-11-14 Last updated: 2013-11-14Bibliographically approved

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Eriksson, AndersAndré, Mats

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