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Statistics and accuracy of magnetic null identification in multispacecraft data
Uppsala universitet, Institutionen för fysik och astronomi.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.ORCID-id: 0000-0003-1654-841x
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Taras Shevchenko Natl Univ Kyiv, Dept Theoret Phys, Kiev, Ukraine..
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2015 (engelsk)Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, s. 6883-6889Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Complex magnetic topologies are ubiquitous in astrophysical plasmas. Analyzing magnetic nulls, regions of vanishing magnetic field, is one way to characterize 3-D magnetic topologies. Magnetic nulls are believed to be important in 3-D reconnection and turbulence. In the vicinity of a null, plasma particles become unmagnetized and can be accelerated to high energies by electric fields. We present the first statistical study of the occurrence of magnetic nulls and their types in the Earth's nightside magnetosphere. We are able to identify the nulls both in the tail and in the magnetopause current sheets. On average, we find one null for every few current sheet crossings. We show that the type identification of magnetic nulls may be sensitive to local fluctuations in the magnetic field. We develop and demonstrate a method to estimate the reliability of the magnetic null type identification.

sted, utgiver, år, opplag, sider
2015. Vol. 42, s. 6883-6889
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URN: urn:nbn:se:kth:diva-253244DOI: 10.1002/2015GL064959ISI: 000363411200002OAI: oai:DiVA.org:kth-253244DiVA, id: diva2:1324662
Forskningsfinansiär
Swedish Research Council, 2013-4309
Merknad

QC 20190624

Tilgjengelig fra: 2019-06-14 Laget: 2019-06-14 Sist oppdatert: 2019-06-24bibliografisk kontrollert

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Eriksson, ElinVaivads, AndrisKhotyaintsev, Yuri. V.Andre, Mats

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Eriksson, ElinVaivads, AndrisKhotyaintsev, Yuri. V.Andre, Mats
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