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Near-Earth plasma sheet boundary dynamics during substorm dipolarization
Austrian Acad Sci, Space Res Inst, Graz, Austria..
Tokyo Inst Technol, Tokyo, Japan..
Space Sci Inst, Boulder, CO USA..
St Petersburg State Univ, St Petersburg, Russia..
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2017 (English)In: Earth Planets and Space, ISSN 1343-8832, E-ISSN 1880-5981, Vol. 69, article id 129Article in journal (Refereed) Published
Abstract [en]

We report on the large-scale evolution of dipolarization in the near-Earth plasma sheet during an intense (AL similar to -1000 nT) substorm on August 10, 2016, when multiple spacecraft at radial distances between 4 and 15 RE were present in the night-side magnetosphere. This global dipolarization consisted of multiple short-timescale (a couple of minutes) Bz disturbances detected by spacecraft distributed over 9 MLT, consistent with the large-scale substorm current wedge observed by ground-based magnetometers. The four spacecraft of the Magnetospheric Multiscale were located in the southern hemisphere plasma sheet and observed fast flow disturbances associated with this dipolarization. The high-time-resolution measurements from MMS enable us to detect the rapid motion of the field structures and flow disturbances separately. A distinct pattern of the flow and field disturbance near the plasma boundaries was found. We suggest that a vortex motion created around the localized flows resulted in another fieldaligned current system at the off-equatorial side of the BBF-associated R1/R2 systems, as was predicted by the MHD simulation of a localized reconnection jet. The observations by GOES and Geotail, which were located in the opposite hemisphere and local time, support this view. We demonstrate that the processes of both Earthward flow braking and of accumulated magnetic flux evolving tailward also control the dynamics in the boundary region of the near-Earth plasma sheet.

Place, publisher, year, edition, pages
SPRINGER HEIDELBERG , 2017. Vol. 69, article id 129
Keyword [en]
Substorm, Dipolarization, Plasma sheet boundary layer, Field-aligned current
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-336036DOI: 10.1186/s40623-017-0707-2ISI: 000411043000001OAI: oai:DiVA.org:uu-336036DiVA, id: diva2:1164967
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-12Bibliographically approved

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Khotyaintsev, Yuri V.
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Swedish Institute of Space Physics, Uppsala Division
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