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Magnetospheric Multiscale Observations of an Ion Diffusion Region With Large Guide Field at the Magnetopause: Current System, Electron Heating, and Plasma Waves
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.
Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA.
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.
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2018 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 123, no 3, p. 1834-1852Article in journal (Refereed) Published
Abstract [en]

We report Magnetospheric Multiscale (MMS) observations of a reconnecting current sheet in the presence of a weak density asymmetry with large guide field at the dayside magnetopause. An ion diffusion region (IDR) was detected associated with this current sheet. Parallel current dominated over the perpendicular current in the IDR, as found in previous studies of component reconnection. Electrons were preferentially heated parallel to the magnetic field within the IDR. The heating was manifested as a flattop distribution below 400eV. Two types of electromagnetic electron whistler waves were observed within the regions where electrons were heated. One type of whistler wave was associated with nonlinear structures in E-|| with amplitudes up to 20mV/m. The other type was not associated with any structures in E-||. Poynting fluxes of these two types of whistler waves were directed away from the X-line. We suggest that the nonlinear evolution of the oblique whistler waves gave rise to the solitary structures in E-||. There was a perpendicular super-Alfvenic outflow jet that was carried by magnetized electrons. Intense electrostatic lower hybrid drift waves were localized in the current sheet center and were probably driven by the super-Alfvenic electron jet, the velocity of which was approximately equal to the diamagnetic drift of demagnetized ions. Our observations suggest that the guide field significantly modified the structures (Hall electromagnetic fields and current system) and wave properties in the IDR.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2018. Vol. 123, no 3, p. 1834-1852
Keywords [en]
magnetic reconnection, dayside magnetopause, ion diffusion region, guide field, plasma waves
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-353178DOI: 10.1002/2017JA024517ISI: 000430125300011OAI: oai:DiVA.org:uu-353178DiVA, id: diva2:1217039
Available from: 2018-06-12 Created: 2018-06-12 Last updated: 2018-06-12Bibliographically approved

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Graham, D. B.

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Swedish Institute of Space Physics, Uppsala Division
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Journal of Geophysical Research - Space Physics
Astronomy, Astrophysics and CosmologyFusion, Plasma and Space Physics

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