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Cold Ionospheric Ions in the Magnetic Reconnection Outflow Region
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2017 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 122, no 10, p. 10,194-10,202Article in journal (Refereed) Published
Abstract [en]

Magnetosheath plasma usually determines properties of asymmetric magnetic reconnection at the subsolar region of Earth's magnetopause. However, cold plasma that originated from the ionosphere can also reach the magnetopause and modify the kinetic physics of asymmetric reconnection. We present a magnetopause crossing with high-density (10–60 cm−3) cold ions and ongoing reconnection from the observation of the Magnetospheric Multiscale (MMS) spacecraft. The magnetopause crossing is estimated to be 300 ion inertial lengths south of the X line. Two distinct ion populations are observed on the magnetosheath edge of the ion jet. One population with high parallel velocities (200–300 km/s) is identified to be cold ion beams, and the other population is the magnetosheath ions. In the deHoffman-Teller frame, the field-aligned magnetosheath ions are Alfvénic and move toward the jet region, while the field-aligned cold ion beams move toward the magnetosheath boundary layer, with much lower speeds. These cold ion beams are suggested to be from the cold ions entering the jet close to the X line. This is the first observation of the cold ionospheric ions in the reconnection outflow region, including the reconnection jet and the magnetosheath boundary layer. ©2017. American Geophysical Union. All Rights Reserved.

Place, publisher, year, edition, pages
Blackwell Publishing, 2017. Vol. 122, no 10, p. 10,194-10,202
Keyword [en]
cold ion, MMS, reconnection outflow
National Category
Fusion, Plasma and Space Physics Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-219468DOI: 10.1002/2017JA024287ISI: 000419937800031Scopus ID: 2-s2.0-85031694123OAI: oai:DiVA.org:kth-219468DiVA, id: diva2:1163252
Note

 QC 20171212

Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2018-02-02Bibliographically approved

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CiteExportLink to record
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