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Estimation of cold plasma outflow during geomagnetic storms
Univ Bergen, Birkeland Ctr Space Sci, Bergen, Norway.;Max Planck Inst Solar Syst Res, Gottingen, Germany..
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.
Belgian Inst Aeron, Brussels, Belgium..
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2015 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 120, no 12, 10622-10639 p.Article in journal (Refereed) Published
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Abstract [en]

Low-energy ions of ionospheric origin constitute a significant contributor to the magnetospheric plasma population. Measuring cold ions is difficult though. Observations have to be done at sufficiently high altitudes and typically in regions of space where spacecraft attain a positive charge due to solar illumination. Cold ions are therefore shielded from the satellite particle detectors. Furthermore, spacecraft can only cover key regions of ion outflow during segments of their orbit, so additional complications arise if continuous longtime observations, such as during a geomagnetic storm, are needed. In this paper we suggest a new approach, based on a combination of synoptic observations and a novel technique to estimate the flux and total outflow during the various phases of geomagnetic storms. Our results indicate large variations in both outflow rates and transport throughout the storm. Prior to the storm main phase, outflow rates are moderate, and the cold ions are mainly emanating from moderately sized polar cap regions. Throughout the main phase of the storm, outflow rates increase and the polar cap source regions expand. Furthermore, faster transport, resulting from enhanced convection, leads to a much larger supply of cold ions to the near-Earth region during geomagnetic storms.

Place, publisher, year, edition, pages
2015. Vol. 120, no 12, 10622-10639 p.
National Category
Fusion, Plasma and Space Physics
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URN: urn:nbn:se:uu:diva-279651DOI: 10.1002/2015JA021810ISI: 000369180200032OAI: oai:DiVA.org:uu-279651DiVA: diva2:909975
Available from: 2016-03-08 Created: 2016-03-02 Last updated: 2017-11-30Bibliographically approved

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Eriksson, AndersAndré, Mats

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