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  • Eriksson, Elin,1989-Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi (author)

Electron Energization at a Reconnecting Magnetosheath Current Sheet

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • American Geophysical Union (AGU),2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-236023
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-236023URI
  • https://doi.org/10.1029/2018GL078660DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-359592URI

Supplementary language notes

  • Language:English
  • Summary in:English &language:-1_t

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Classification

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

Notes

  • QC 20181012
  • We present observations of electron energization within a sub-ion-scale magnetosheath current sheet (CS). A number of signatures indicate ongoing reconnection, including the thickness of the CS (similar to 0.7 ion inertial length), nonzero normal magnetic field, Hall magnetic fields with electrons carrying the Hall currents, and electron heating. We observe localized electron acceleration and heating parallel to the magnetic field at the edges of the CS. Electrostatic waves observed in these regions have low phase velocity and small wave potentials and thus cannot provide the observed acceleration and heating. Instead, we find that the electrons are accelerated by a parallel potential within the separatrix regions. Similar acceleration has been reported based on magnetopause and magnetotail observations. Thus, despite the different plasma conditions in magnetosheath, magnetopause, and magnetotail, the acceleration mechanism and corresponding heating of electrons is similar. Plain Language Summary Magnetic reconnection is an important physical energy conversion process in astrophysical and laboratory plasmas. The easiest place to analyze magnetic reconnection is in near-Earth space. Due to lack of sufficient electron resolution of previous spacecraft missions, there are many unanswered questions regarding electron heating and acceleration processes at small scales. In particular, the regime where thermal pressure dominates over magnetic pressure, the most common state of plasmas in the Universe, is little explored. In this letter we study such a regime using the four-spacecraft Magnetospheric Multiscale mission. We analyze a reconnecting current sheet in the magnetosheath. We show that electrons are energized by a parallel potential, similar to what has been observed in the different plasma regimes the magnetopause and magnetotail. Thus, despite different plasma conditions, a similar acceleration mechanism and corresponding heating of electrons is occurring in all these regions.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Vaivads, AndrisUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)anvai517 (author)
  • Graham, Daniel B.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)dangr618 (author)
  • Divin, AndreyUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Physics Department, St. Petersburg State University, St. Petersburg, Russia(Swepub:uu)anddi786 (author)
  • Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
  • Yordanova, EmiliyaUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)emiyo411 (author)
  • André, MatsUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi(Swepub:uu)maand125 (author)
  • Giles, Barbara L.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA. (author)
  • Pollock, Craig J.Denali Sci LLC, Healy, AK USA. (author)
  • Russell, Christopher T.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA. (author)
  • Le Contel, OlivierUniv Paris Sud, Sorbonne Univ, Observ Paris, Ecole Polytech,CNRS,Lab Phys Plasmas, Paris, France. (author)
  • Torbert, Roy B.Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. (author)
  • Ergun, Robert E.Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA. (author)
  • Lindqvist, Per-ArneKTH,Rymd- och plasmafysik(Swepub:kth)u1yukyk9 (author)
  • Burch, James L.Southwest Res Inst, San Antonio, TX USA. (author)
  • Uppsala universitetInstitutet för rymdfysik, Uppsalaavdelningen (creator_code:org_t)

Related titles

  • In:Geophysical Research Letters: American Geophysical Union (AGU)45:16, s. 8081-80900094-82761944-8007

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