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MMS observations of whistler waves in electron diffusion region
Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.
Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.
Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.
Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 9, p. 3954-3962Article in journal (Refereed) Published
Abstract [en]

Whistler waves that can produce anomalous resistivity by affecting electrons' motion have been suggested as one of the mechanisms responsible for magnetic reconnection in the electron diffusion region (EDR). Such type of waves, however, has rarely been observed inside the EDR so far. In this study, we report such an observation by Magnetospheric Multiscale (MMS) mission. We find large-amplitude whistler waves propagating away from the X line with a very small wave-normal angle. These waves are probably generated by the perpendicular temperature anisotropy of the -300eV electrons inside the EDR, according to our analysis of dispersion relation and cyclotron resonance condition; they significantly affect the electron-scale dynamics of magnetic reconnection and thus support previous simulations.

Place, publisher, year, edition, pages
2017. Vol. 44, no 9, p. 3954-3962
Keywords [en]
magnetic reconnection, electron diffusion region, whistler waves, perpendicular temperature anisotropy, anomalous resistivity
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-359263DOI: 10.1002/2017GL072703ISI: 000402143700001OAI: oai:DiVA.org:uu-359263DiVA, id: diva2:1245689
Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2018-09-05Bibliographically approved

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Graham, Daniel B.Khotyaintsev, Yuri V.André, Mats

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Swedish Institute of Space Physics, Uppsala Division
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