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MMS Observations of Multiscale Hall Physics in the Magnetotail
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-6997-7037
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0003-3725-4920
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0002-1046-746x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-5550-3113
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2019 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, no 17-18, p. 10230-10239Article in journal (Refereed) Published
Abstract [en]

We present Magnetospheric Multiscale mission (MMS) observations of Hall physics in the magnetotail, which compared to dayside Hall physics is a relatively unexplored topic. The plasma consists of electrons, moderately cold ions (T similar to 1.5 keV) and hot ions (T similar to 20 keV). MMS can differentiate between the cold ion demagnetization region and hot ion demagnetization regions, which suggests that MMS was observing multiscale Hall physics. The observed Hall electric field is compared with a generalized Ohm's law, accounting for multiple ion populations. The cold ion population, despite its relatively high initial temperature, has a significant impact on the Hall electric field. These results show that multiscale Hall physics is relevant over a much larger temperature range than previously observed and is relevant for the whole magnetosphere as well as for other astrophysical plasma.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2019. Vol. 46, no 17-18, p. 10230-10239
Keywords [en]
cold ions, Hall physics, reconnection, multiscale, MMS, magnetotail
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-408849DOI: 10.1029/2019GL084137ISI: 000485377500001OAI: oai:DiVA.org:uu-408849DiVA, id: diva2:1423726
Funder
Swedish National Space Board, SNSB 176/15Swedish National Space Board, 158/16Available from: 2020-04-15 Created: 2020-04-15 Last updated: 2020-04-15Bibliographically approved

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Alm, LoveAndré, MatsGraham, Daniel B.Khotyaintsev, Yuri V.

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Alm, LoveAndré, MatsGraham, Daniel B.Khotyaintsev, Yuri V.Vaivads, Andris
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Geophysical Research Letters
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