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Effects in the Near-Magnetopause Magnetosheath Elicited by Large-Amplitube Alfvenic Fluctuations Terminating in a Field and Flow Discontinuity

Farrugia, C. J. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Cohen, I. J. (author)
Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA.
Vasquez, B. J. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
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Lugaz, N. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Alm, Love (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Torbert, R. B. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Argall, M. R. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Paulson, K. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Lavraud, B. (author)
UPMC Univ Paris 06, Univ Paris Sud, Ecole Polytech, LPP,UMR7648,CNRS,Observ Paris, Paris, France.,Southwest Res Inst, San Antonio, TX USA,NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
Gershman, D. J. (author)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
Gratton, F. T. (author)
Acad Nacl Ciencias Buenos Aires, Buenos Aires, DF, Argentina.,Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA
Matsui, H. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Rogers, A. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Forbes, T. G. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Payne, D. (author)
Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
Ergun, R. E. (author)
Univ Colorado, Boulder, CO 80309 USA.
Mauk, B. (author)
Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA.
Burch, J. L. (author)
Southwest Res Inst, San Antonio, TX USA.
Russell, C. T. (author)
Univ Calif Los Angeles, Los Angeles, CA USA.
Strangeway, R. J. (author)
Univ Calif Los Angeles, Los Angeles, CA USA.
Shuster, J. (author)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
Nakamura, R. (author)
Space Res Inst, Graz, Austria.
Fuselier, S. A. (author)
Southwest Res Inst, San Antonio, TX USA.;Univ Texas San Antonio, San Antonio, TX USA.
Giles, B. L. (author)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
Khotyaintsev, Yuri V. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Lindqvist, Per-Arne (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Marklund, G. T. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Petrinec, S. M. (author)
Lockheed Martin Adv Technol Ctr, Palo Alto, CA USA.
Pollock, C. J. (author)
West Virginia Univ, Morgantown, WV USA.
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Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA. (creator_code:org_t)
AMER GEOPHYSICAL UNION, 2018
2018
English.
In: Journal of Geophysical Research - Space Physics. - : AMER GEOPHYSICAL UNION. - 2169-9380 .- 2169-9402. ; 123:11, s. 8983-9004
Related links:
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • In this paper we report on a sequence of large-amplitude Alfvenic fluctuations terminating in a field and flow discontinuity and their effects on electromagnetic fields and plasmas in the near-magnetopause magnetosheath. An arc-polarized structure in the magnetic field was observed by the Time History of Events and Macroscale Interactions during Substorms-C in the solar wind, indicative of nonlinear Alfven waves. It ends with a combined tangential discontinuity/vortex sheet, which is strongly inclined to the ecliptic plane and at which there is a sharp rise in the density and a drop in temperature. Several effects resulting from this structure were observed by the Magnetospheric Multiscale spacecraft in the magnetosheath close to the subsolar point (11:30 magnetic local time) and somewhat south of the geomagnetic equator (-33 degrees magnetic latitude): (i) kinetic Alfven waves; (ii) a peaking of the electric and magnetic field strengths where E . J becomes strong and negative (-1 nW/m(3)) just prior to an abrupt dropout of the fields; (iii) evolution in the pitch angle distribution of energetic (a few tens of kilo-electron-volts) ions (H+, Hen+, and On+) and electrons inside a high-density region, which we attribute to gyrosounding of the tangential discontinuity/vortex sheet structure passing by the spacecraft; (iv) field-aligned acceleration of ions and electrons that could be associated with localized magnetosheath reconnection inside the high-density region; and (v) variable and strong flow changes, which we argue to be unrelated to reconnection at partial magnetopause crossings and likely result from deflections of magnetosheath flow by a locally deformed, oscillating magnetopause.

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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