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  • Schwartz, Steven J.Imperial Coll London, London, England;Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)

Ion Kinetics in a Hot Flow Anomaly : MMS Observations

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • Blackwell Publishing,2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-253640
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253640URI
  • https://doi.org/10.1029/2018GL080189DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-372713URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20190618
  • Hot Flow Anomalies (HFAs) are transients observed at planetary bow shocks, formed by the shock interaction with a convected interplanetary current sheet. The primary interpretation relies on reflected ions channeled upstream along the current sheet. The short duration of HFAs has made direct observations of this process difficult. We employ high resolution measurements by NASA's Magnetospheric Multiscale Mission to probe the ion microphysics within a HFA. Magnetospheric Multiscale Mission data reveal a smoothly varying internal density and pressure, which increase toward the trailing edge of the HFA, sweeping up particles trapped within the current sheet. We find remnants of reflected or other backstreaming ions traveling along the current sheet, but most of these are not fast enough to out-run the incident current sheet convection. Despite the high level of internal turbulence, incident and backstreaming ions appear to couple gyro-kinetically in a coherent manner. Plain Language Summary Shock waves in space are responsible for energizing particles and diverting supersonic flows around planets and other obstacles. Explosive events known as Hot Flow Anomalies (HFAs) arise when a rapid change in the interplanetary magnetic field arrives at the bow shock formed by, for example, the supersonic solar wind plasma flow from the Sun impinging on the Earth's magnetic environment. HFAs are known to produce impacts all the way to ground level, but the physics responsible for their formation occur too rapidly to be resolved by previous satellite missions. This paper employs NASA's fleet of four Magnetospheric Multiscale satellites to reveal for the first time clear, discreet populations of ions that interact coherently to produce the extreme heating and deflection.

Subject headings and genre

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  • Avanov, LevonNASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA (author)
  • Turner, DrewAerosp Corp, POB 92957, Los Angeles, CA 90009 USA (author)
  • Zhang, HuiUniv Alaska Fairbanks, Geophys Inst, Fairbanks, AK 99775 USA (author)
  • Gingell, ImogenImperial Coll London, London, England (author)
  • Eastwood, Jonathan P.Imperial Coll London, London, England (author)
  • Gershman, Daniel J.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA (author)
  • Johlander, Andreas,1990-Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)andjo888 (author)
  • Russell, Christopher T.Univ Calif Los Angeles, Earth Planetary & Space Sci, Los Angeles, CA USA (author)
  • Burch, James L.Southwest Res Inst, San Antonio, TX USA (author)
  • Dorelli, John C.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA (author)
  • Eriksson, StefanUniv Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)
  • Ergun, Robert E.Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)
  • Fuselier, Stephen A.Southwest Res Inst, San Antonio, TX USA;Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA (author)
  • Giles, Barbara L.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA (author)
  • Goodrich, Katherine A.Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)
  • Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
  • Lavraud, BenoitImperial Coll London, London, England;Univ Toulouse, UPS, CNRS, Inst Rech Astrophys & Planetol,CNES, Toulouse, France (author)
  • Lindqvist, Per-ArneUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:kth)u1yukyk9 (author)
  • Oka, MitsuoImperial Coll London, London, England;Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA (author)
  • Phan, Tai-Duc (author)
  • Strangeway, Robert J.Univ Calif Los Angeles, Earth Planetary & Space Sci, Los Angeles, CA USA (author)
  • Trattner, Karlheinz J.Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)
  • Torbert, Roy B.Imperial Coll London, London, England;Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA;Univ New Hampshire, Dept Phys, Durham, NH 03824 USA (author)
  • Vaivads, AndrisUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)anvai517 (author)
  • Wei, HanyingUniv Calif Los Angeles, Earth Planetary & Space Sci, Los Angeles, CA USA (author)
  • Wilder, FrederickUniv Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)
  • Imperial Coll London, London, England;Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80309 USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA (creator_code:org_t)

Related titles

  • In:Geophysical Research Letters: Blackwell Publishing45:21, s. 11520-115290094-82761944-8007

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