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MMS Observations and Hybrid Simulations of Surface Ripples at a Marginally Quasi-Parallel Shock
Imperial Coll London, Blackett Lab, London, England..
Imperial Coll London, Blackett Lab, London, England..
Queen Mary Univ London, Sch Phys & Astron, London, England..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-7714-1870
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2017 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 122, no 11, p. 11003-11017Article in journal (Refereed) Published
Abstract [en]

Simulations and observations of collisionless shocks have shown that deviations of the nominal local shock normal orientation, that is, surface waves or ripples, are expected to propagate in the ramp and overshoot of quasi-perpendicular shocks. Here we identify signatures of a surface ripple propagating during a crossing of Earth's marginally quasi-parallel (theta(Bn) similar to 45 degrees) or quasi-parallel bow shock on 27 November 2015 06: 01: 44 UTC by the Magnetospheric Multiscale (MMS) mission and determine the ripple's properties using multispacecraft methods. Using two-dimensional hybrid simulations, we confirm that surface ripples are a feature of marginally quasi-parallel and quasi-parallel shocks under the observed solar wind conditions. In addition, since these marginally quasi-parallel and quasi-parallel shocks are expected to undergo a cyclic reformation of the shock front, we discuss the impact of multiple sources of nonstationarity on shock structure. Importantly, ripples are shown to be transient phenomena, developing faster than an ion gyroperiod and only during the period of the reformation cycle when a newly developed shock ramp is unaffected by turbulence in the foot. We conclude that the change in properties of the ripple observed by MMS is consistent with the reformation of the shock front over a time scale of an ion gyroperiod.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2017. Vol. 122, no 11, p. 11003-11017
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:uu:diva-342086DOI: 10.1002/2017JA024538ISI: 000419938600008OAI: oai:DiVA.org:uu-342086DiVA, id: diva2:1186907
Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2018-03-01Bibliographically approved

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Johlander, AndreasRussell, Christopher T.Khotyaintsev, Yuri V.
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