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  • Fadanelli, S.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France;Univ Pisa, Dipartimento Fis, Pisa, Italy (author)

Four-Spacecraft Measurements of the Shape and Dimensionality of Magnetic Structures in the Near-Earth Plasma Environment

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:uu-398821
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-398821URI
  • https://doi.org/10.1029/2019JA026747DOI

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  • Language:English
  • Summary in:English

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

Notes

  • We present a new method for determining the main relevant features of the local magnetic field configuration, based entirely on the knowledge of the magnetic field gradient four‐spacecraft measurements. The method, named “magnetic configuration analysis” (MCA), estimates the spatial scales on which the magnetic field varies locally. While it directly derives from the well‐known magnetic directional derivative and magnetic rotational analysis procedures (Shi et al., 2005, htpps://doi.org/10.1029/2005GL022454; Shen et al., 2007, https://doi.org/10.1029/2005JA011584), MCA was specifically designed to address the actual magnetic field geometry. By applying MCA to multispacecraft data from the Magnetospheric Multiscale (MMS) satellites, we perform both case and statistical analyses of local magnetic field shape and dimensionality at very high cadence and small scales. We apply this technique to different near‐Earth environments and define a classification scheme for the type of configuration observed. While our case studies allow us to benchmark the method with those used in past works, our statistical analysis unveils the typical shape of magnetic configurations and their statistical distributions. We show that small‐scale magnetic configurations are generally elongated, displaying forms of cigar and blade shapes, but occasionally being planar in shape like thin pancakes (mostly inside current sheets). Magnetic configurations, however, rarely show isotropy in their magnetic variance. The planar nature of magnetic configurations and, most importantly, their scale lengths strongly depend on the plasma β parameter. Finally, the most invariant direction is statistically aligned with the electric current, reminiscent of the importance of electromagnetic forces in shaping the local magnetic configuration.

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  • Lavraud, B.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Califano, F.Univ Pisa, Dipartimento Fis, Pisa, Italy (author)
  • Jacquey, C.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Vernisse, Y.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Kacem, IUniv Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Penou, E.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Gershman, D. J.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Dorelli, J.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Pollock, C.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Giles, B. L.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Avanov, L. A.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Burch, J.Southwest Res Inst, San Antonio, TX USA (author)
  • Chandler, M. O.NASA, Marshall Space Flight Ctr, Huntsville, AL USA (author)
  • Coffey, V. N.NASA, Marshall Space Flight Ctr, Huntsville, AL USA (author)
  • Eastwood, J. P.Imperial Coll London, Dept Phys, Blackett Lab, London, England (author)
  • Ergun, R.Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA (author)
  • Farrugia, C. J.Univ New Hamsphire, Phys Dept, Durham, NH USA;Univ New Hamsphire, Space Sci Ctr, Durham, NH USA (author)
  • Fuselier, S. A.Southwest Res Inst, San Antonio, TX USA;Univ Texas San Antonio, Dept Phys, San Antonio, TX USA (author)
  • Genot, V. N.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Grigorenko, E.Russian Acad Sci, Space Res Inst, Moscow, Russia (author)
  • Hasegawa, H.JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan (author)
  • Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
  • Le Contel, O.Univ Paris Sud, Lab Phys Plasmas, CNRS, Ecole Polytech,Sorbonne Univ,Observ Paris, Paris, France (author)
  • Marchaudon, A.Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Moore, T. E.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Nakamura, R.Space Res Inst, Graz, Austria (author)
  • Paterson, W. R.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Phan, T.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA (author)
  • Rager, A. C.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Russell, C. T.Univ Calif Los Angeles, Inst Geophys Earth Planetary & Space Sci, Los Angeles, CA USA (author)
  • Saito, Y.JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan (author)
  • Sauvaud, J-AUniv Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Schiff, C.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Smith, S. E.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA (author)
  • Redondo, S. ToledoUniv Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (author)
  • Torbert, R. B.Univ New Hamsphire, Phys Dept, Durham, NH USA;Univ New Hamsphire, Space Sci Ctr, Durham, NH USA (author)
  • Wang, S.Univ Maryland, Dept Astron, College Pk, MD 20742 USA (author)
  • Yokota, S.Osaka Univ, Grad Sch Sci, Toyonaka, Osaka, Japan (author)
  • Univ Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France;Univ Pisa, Dipartimento Fis, Pisa, ItalyUniv Toulouse, CNES, Inst Rech Astrophys & Planetol, CNRS,UPS, Toulouse, France (creator_code:org_t)

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  • In:Journal of Geophysical Research - Space Physics124:8, s. 6850-68682169-93802169-9402

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