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Dipolarization in the inner magnetosphere during a geomagnetic storm on 7 October 2015
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2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 18, 9397-9405 p.Article in journal (Refereed) Published
Abstract [en]

A dipolarization event was observed by the Magnetospheric Multiscale (MMS) spacecraft at L = 3.8 and 19.8 magnetic local time starting at ∼23:42:36 UT on 7 October 2015. The magnetic and electric fields showed initially coherent variations between the spacecraft. The sunward convection turned tailward after the dipolarization. The observation is interpreted in terms of the pressure balance or the momentum equation. This was followed by a region traversed where the fields were irregular. The scale length was of the order of the ion gyroradius, suggesting the kinetic nature of the fluctuations. Combination of the multi-instrument, multispacecraft data reveals a more detailed picture of the dipolarization event in the inner magnetosphere. Conjunction ionosphere-plasmasphere observations from DMSP, two-dimensional GPS total electron content, the Millstone Hill midlatitude incoherent scatter radar, and AMPERE measurements imply that MMS observations are located on the poleward edge of the ionospheric trough where Region 2 field-aligned currents flow.

Place, publisher, year, edition, pages
Blackwell Publishing, 2016. Vol. 43, no 18, 9397-9405 p.
Keyword [en]
dipolarization, geomagnetic storm, inner magnetosphere, magnetosphere-ionosphere coupling, Electric fields, Geomagnetism, Ionosphere, Ionospheric measurement, Radar, Spacecraft, Storms, Field aligned currents, Incoherent scatter radar, Magnetic and electric fields, Magnetospheric multi scale, Magnetosphere
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-195443DOI: 10.1002/2016GL070677ScopusID: 2-s2.0-84988640811OAI: oai:DiVA.org:kth-195443DiVA: diva2:1050264
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QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2016-11-28Bibliographically approved

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Lindqvist, Per-ArneMarklund, Göran T.
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