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MMS Observations an...
MMS Observations and Hybrid Simulations of Surface Ripples at a Marginally Quasi-Parallel Shock
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- Gingell, Imogen (author)
- Imperial Coll London, Blackett Lab, London, England.
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- Schwartz, Steven J. (author)
- Imperial Coll London, Blackett Lab, London, England.
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- Burgess, David (author)
- Queen Mary Univ London, Sch Phys & Astron, London, England.
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- Johlander, Andreas, 1990- (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Russell, Christopher T. (author)
- Univ Calif Los Angeles, Dept Earth & Planetary Sci Phys, Los Angeles, CA USA.
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- Burch, James L. (author)
- Southwest Res Inst, San Antonio, TX USA.
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- Ergun, Robert E. (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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- Fuselier, Stephen (author)
- Southwest Res Inst, San Antonio, TX USA.;Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA.
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- Gershman, Daniel J. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Giles, Barbara L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Goodrich, Katherine A. (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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- Khotyaintsev, Yuri V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Lavraud, Benoit (author)
- Univ Toulouse, Inst Rech Astrophys & Planetol, Toulouse, France.
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- Lindqvist, Per-Arne (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Strangeway, Robert J. (author)
- Univ Calif Los Angeles, Dept Earth & Planetary Sci Phys, Los Angeles, CA USA.
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- Trattner, Karlheinz (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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- Torbert, Roy B. (author)
- Univ New Hampshire, Phys Dept, Durham, NH 03824 USA.
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- Wei, Hanying (author)
- Univ Calif Los Angeles, Dept Earth & Planetary Sci Phys, Los Angeles, CA USA.
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- Wilder, Frederick (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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Imperial Coll London, Blackett Lab, London, England Queen Mary Univ London, Sch Phys & Astron, London, England. (creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2017
- 2017
- English.
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In: Journal of Geophysical Research - Space Physics. - : AMER GEOPHYSICAL UNION. - 2169-9380 .- 2169-9402. ; 122:11, s. 11003-11017
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https://uu.diva-port... (primary) (Raw object)
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- By the author/editor
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Gingell, Imogen
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Schwartz, Steven ...
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Burgess, David
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Johlander, Andre ...
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Russell, Christo ...
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Burch, James L.
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Ergun, Robert E.
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Fuselier, Stephe ...
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Gershman, Daniel ...
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Giles, Barbara L ...
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Goodrich, Kather ...
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Khotyaintsev, Yu ...
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Lavraud, Benoit
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Lindqvist, Per-A ...
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Strangeway, Robe ...
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Trattner, Karlhe ...
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Torbert, Roy B.
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Wei, Hanying
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Wilder, Frederic ...
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Royal Institute of Technology
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Uppsala University