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Publications (2 of 2) Show all publications
Fu, H. S., Cao, J. B., Vaivads, A., Khotyaintsev, Y. V., Andre, M., Dunlop, M., . . . Eriksson, E. (2016). Identifying magnetic reconnection events using the FOTE method. Journal of Geophysical Research - Space Physics, 121(2), 1263-1272
Open this publication in new window or tab >>Identifying magnetic reconnection events using the FOTE method
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2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 2, p. 1263-1272Article in journal (Refereed) Published
Abstract [en]

A magnetic reconnection event detected by Cluster is analyzed using three methods: Single-spacecraft Inference based on Flow-reversal Sequence (SIFS), Multispacecraft Inference based on Timing a Structure (MITS), and the First-Order Taylor Expansion (FOTE). Using the SIFS method, we find that the reconnection structure is an X line; while using the MITS and FOTE methods, we find it is a magnetic island (O line). We compare the efficiency and accuracy of these three methods and find that the most efficient and accurate approach to identify a reconnection event is FOTE. In both the guide and nonguide field reconnection regimes, the FOTE method is equally applicable. This study for the first time demonstrates the capability of FOTE in identifying magnetic reconnection events; it would be useful to the forthcoming Magnetospheric Multiscale (MMS) mission. ion

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2016
Keywords
magnetic reconnection, MMS mission, FOTE method, magnetic null, X line, O line
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253248 (URN)10.1002/2015JA021701 (DOI)000373002100023 ()2-s2.0-84975698091 (Scopus ID)
Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2020-01-30Bibliographically approved
Eriksson, E., Vaivads, A., Khotyaintsev, Y. V. V., Khotyayintsev, V. M. & Andre, M. (2015). Statistics and accuracy of magnetic null identification in multispacecraft data. Geophysical Research Letters, 42, 6883-6889
Open this publication in new window or tab >>Statistics and accuracy of magnetic null identification in multispacecraft data
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2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, p. 6883-6889Article in journal (Refereed) 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.

National Category
Geophysics Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-253244 (URN)10.1002/2015GL064959 (DOI)000363411200002 ()
Funder
Swedish Research Council, 2013-4309
Note

QC 20190624

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2020-01-30Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4040-9663

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