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  • Hasegawa, H.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Japan.,Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA. (author)

Magnetic Field Annihilation in a Magnetotail Electron Diffusion Region With Electron-Scale Magnetic Island

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • American Geophysical Union (AGU),2022
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-315845
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-315845URI
  • https://doi.org/10.1029/2022JA030408DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-481399URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

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

Notes

  • QC 20220721
  • We present observations in Earth's magnetotail by the Magnetospheric Multiscale spacecraft that are consistent with magnetic field annihilation, rather than magnetic topology change, causing fast magnetic-to-electron energy conversion in an electron-scale current sheet. Multi-spacecraft analysis for the magnetic field reconstruction shows that an electron-scale magnetic island was embedded in the observed electron diffusion region (EDR), suggesting an elongated shape of the EDR. Evidence for the annihilation was revealed in the form of the island growing at a rate much lower than expected for the standard X-type geometry of the EDR, which indicates that magnetic flux injected into the EDR was not ejected from the X-point or accumulated in the island, but was dissipated in the EDR. This energy conversion process is in contrast to that in the standard EDR of a reconnecting current sheet where the energy of antiparallel magnetic fields is mostly converted to electron bulk-flow energy. Fully kinetic simulation also demonstrates that an elongated EDR is subject to the formation of electron-scale magnetic islands in which fast but transient annihilation can occur. Consistent with the observations and simulation, theoretical analysis shows that fast magnetic diffusion can occur in an elongated EDR in the presence of nongyrotropic electron effects. We suggest that the annihilation in elongated EDRs may contribute to the dissipation of magnetic energy in a turbulent collisionless plasma.

Subject headings and genre

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

  • Denton, R. E.Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA. (author)
  • Nakamura, T. K. M.Austrian Acad Sci, Space Res Inst, Graz, Austria.;Graz Univ, Inst Phys, Graz, Austria. (author)
  • Genestreti, K. J.Southwest Res Inst, Durham, NH USA. (author)
  • Phan, T. D.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA. (author)
  • Nakamura, R. (author)
  • Hwang, K. -j.Southwest Res Inst, San Antonio, TX USA. (author)
  • Ahmadi, N.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA. (author)
  • Shi, Q. Q.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Shandong, Peoples R China. (author)
  • Hesse, M.NASA, Ames Res Ctr, Moffett Field, CA USA. (author)
  • Burch, J. L. (author)
  • Webster, J. M. (author)
  • Torbert, R. B.Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. (author)
  • Giles, B. L.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA. (author)
  • Gershman, D. J. (author)
  • Russell, C. T.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA. (author)
  • Strangeway, R. J.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA. (author)
  • Wei, H. Y.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA. (author)
  • Lindqvist, Per-ArneKTH,Rymd- och plasmafysik(Swepub:kth)u1yukyk9 (author)
  • Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
  • Ergun, R. E.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO USA. (author)
  • Saito, Y.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Japan. (author)
  • Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Japan.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA. (creator_code:org_t)

Related titles

  • In:Journal of Geophysical Research - Space Physics: American Geophysical Union (AGU)127:72169-93802169-9402

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