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Cold ion demagnetization near the X-line of magnetic reconnection
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2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 13, 6759-6767 p.Article in journal (Refereed) Published
Abstract [en]

Although the effects of magnetic reconnection in magnetospheres can be observed at planetary scales, reconnection is initiated at electron scales in a plasma. Surrounding the electron diffusion region, there is an Ion-Decoupling Region (IDR) of the size of the ion length scales (inertial length and gyroradius). Reconnection at the Earth's magnetopause often includes cold magnetospheric (few tens of eV), hot magnetospheric (10keV), and magnetosheath (1keV) ions, with different gyroradius length scales. We report observations of a subregion inside the IDR of the size of the cold ion population gyroradius (approximate to 15km) where the cold ions are demagnetized and accelerated parallel to the Hall electric field. Outside the subregion, cold ions follow the E x B motion together with electrons, while hot ions are demagnetized. We observe a sharp cold ion density gradient separating the two regions, which we identify as the cold and hot IDRs.

Place, publisher, year, edition, pages
Blackwell Publishing, 2016. Vol. 43, no 13, 6759-6767 p.
Keyword [en]
magnetic reconnection
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-193237DOI: 10.1002/2016GL069877ISI: 000380901600010Scopus ID: 2-s2.0-84978880834OAI: oai:DiVA.org:kth-193237DiVA: diva2:1034137
Note

QC 20161011

Available from: 2016-10-11 Created: 2016-09-30 Last updated: 2017-11-29Bibliographically approved

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