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MMS Study of the Structure of Ionâ Scale Flux Ropes in the Earth’s Crossâ Tail Current Sheet
dc.contributor.authorSun, W. J.
dc.contributor.authorSlavin, J. A.
dc.contributor.authorTian, A. M.
dc.contributor.authorBai, S. C.
dc.contributor.authorPoh, G. K.
dc.contributor.authorAkhavan‐tafti, M.
dc.contributor.authorLu, San
dc.contributor.authorYao, S. T.
dc.contributor.authorLe, G.
dc.contributor.authorNakamura, R.
dc.contributor.authorGiles, B. L.
dc.contributor.authorBurch, J. L.
dc.date.accessioned2019-08-09T17:13:57Z
dc.date.availableWITHHELD_11_MONTHS
dc.date.available2019-08-09T17:13:57Z
dc.date.issued2019-06-28
dc.identifier.citationSun, W. J.; Slavin, J. A.; Tian, A. M.; Bai, S. C.; Poh, G. K.; Akhavan‐tafti, M. ; Lu, San; Yao, S. T.; Le, G.; Nakamura, R.; Giles, B. L.; Burch, J. L. (2019). "MMS Study of the Structure of Ionâ Scale Flux Ropes in the Earth’s Crossâ Tail Current Sheet." Geophysical Research Letters 46(12): 6168-6177.
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/2027.42/150544
dc.description.abstractThis study analyzes 25 ionâ scale flux ropes in the Magnetospheric Multiscale (MMS) observations to determine their structures. The high temporal and spatial resolution MMS measurements enable the application of multispacecraft techniques to ionâ scale flux ropes. Flux ropes are identified as quasiâ oneâ dimensional (quasiâ 1â D) when they retain the features of reconnecting current sheets; that is, the magnetic field gradient is predominantly northward or southward, and quasiâ 2â D when they exhibit circular cross sections; that is, the magnetic field gradients in the plane transverse to the flux rope axis are comparable. The analysis shows that the quasiâ 2â D events have larger core fields and smaller pressure variations than the quasiâ 1â D events. These two types of flux ropes could be the result of different processes, including magnetic reconnection with different dawnâ dusk magnetic field components, temporal transformation of flattened structure to circular, or interactions with external environments.Plain Language SummaryMagnetic flux ropes are fundamental magnetic structures in space plasma physics and are commonly seen in the universe, such as, astrophysical jets, coronal mass ejections, and planetary magnetospheres. Flux ropes are important in mass and energy transport across plasma and magnetic boundaries, and they are found in a wide range of spatial sizes, from several tens of kilometers, that is, ionâ scale flux ropes, to tens of millions of kilometers, that is, coronal mass ejections, in the solar system. The ionâ scale flux ropes can be formed during magnetic reconnection and are hypothesized to energize electrons and influence the reconnection rate. Previous examinations of the structure of ionâ scale flux ropes were greatly limited by measurement resolution. The unprecedented Magnetospheric Multiscale (MMS) mission high temporal and spatial resolution measurements provide a unique opportunity to investigate flux rope structures. By employing multispacecraft techniques, this study has provided new insights into the magnetic field variations and dimensionality of ionâ scale flux ropes in the Earth’s magnetotail. The results are consistent with the evolution of ionâ scale flux ropes from initially flattened current sheetâ like flux ropes near the time of formation into lower energy state with circular cross section predicted by theory and termed as the â Taylorâ state.Key PointsIonâ scale flux ropes are observed to have either flattened or circular cross sections using MDD and GS reconstructionAnalysis of 25 flux ropes show that circular crossâ section flux ropes have stronger core field and smaller thermal pressures than flattened flux ropesThe two types of flux ropes may be the results of reconnection, temporal evolution, or interactions with external environment
dc.publisherWiley Periodicals, Inc.
dc.publisherESA Publication
dc.subject.othermagnetic structure
dc.subject.otherplasma depletion
dc.subject.otherevolution
dc.subject.otherionâ scale FRs
dc.titleMMS Study of the Structure of Ionâ Scale Flux Ropes in the Earth’s Crossâ Tail Current Sheet
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/150544/1/grl59049.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/150544/2/grl59049_am.pdf
dc.identifier.doi10.1029/2019GL083301
dc.identifier.sourceGeophysical Research Letters
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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Remediation of Harmful Language

The University of Michigan Library aims to describe its collections in a way that respects the people and communities who create, use, and are represented in them. We encourage you to Contact Us anonymously if you encounter harmful or problematic language in catalog records or finding aids. More information about our policies and practices is available at Remediation of Harmful Language.

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