Global Structure of Magnetotail Reconnection Revealed by Mining Space Magnetometer Data
dc.contributor.author | Stephens, G. K. | |
dc.contributor.author | Sitnov, M. I. | |
dc.contributor.author | Weigel, R. S. | |
dc.contributor.author | Turner, D. L. | |
dc.contributor.author | Tsyganenko, N. A. | |
dc.contributor.author | Rogers, A. J. | |
dc.contributor.author | Genestreti, K. J. | |
dc.contributor.author | Slavin, J. A. | |
dc.date.accessioned | 2023-03-03T21:09:00Z | |
dc.date.available | 2024-03-03 16:08:52 | en |
dc.date.available | 2023-03-03T21:09:00Z | |
dc.date.issued | 2023-02 | |
dc.identifier.citation | Stephens, G. K.; Sitnov, M. I.; Weigel, R. S.; Turner, D. L.; Tsyganenko, N. A.; Rogers, A. J.; Genestreti, K. J.; Slavin, J. A. (2023). "Global Structure of Magnetotail Reconnection Revealed by Mining Space Magnetometer Data." Journal of Geophysical Research: Space Physics 128(2): n/a-n/a. | |
dc.identifier.issn | 2169-9380 | |
dc.identifier.issn | 2169-9402 | |
dc.identifier.uri | https://hdl.handle.net/2027.42/175895 | |
dc.description.abstract | Reconnection in the magnetotail occurs along so-called X-lines, where magnetic field lines tear and detach from plasma on microscopic spatial scales (comparable to particle gyroradii). In 2017–2020, the Magnetospheric MultiScale (MMS) mission detected X-lines in the magnetotail enabling their investigation on local scales. However, the global structure and evolution of these X-lines, critical for understanding their formation and total energy conversion mechanisms, remained virtually unknown because of the intrinsically local nature of observations and the extreme sparsity of concurrent data. Here, we show that mining a multi-mission archive of space magnetometer data collected over the last 26 yr and then fitting a magnetic field representation modeled using flexible basis-functions faithfully reconstructs the global pattern of X-lines; 24 of the 26 modeled X-lines match (Bz = 0 isocontours are within ∼2 Earth radii or RE) or nearly match (Bz = 2 nT isocontours are within ∼2RE) the locations of the MMS encountered reconnection sites. The obtained global reconnection picture is considered in the context of substorm activity, including conventional substorms and more complex events.Plain Language SummaryMagnetic reconnection is a fundamental process in plasmas which couples microscopic scales (∼electron to proton gyroradii) to explosive macroscopic phenomena many orders of magnitude larger, such as solar flares and geomagnetic storms/substorms. Reconnection forms along “X-lines”, rifts where oppositely directed magnetic field lines are forced together. In the Earth’s magnetosphere, reconnection has been observed by satellites at isolated locations; however, the large-scale structure of X-lines and their time evolution remains unknown because of the rarity and local nature of observations. Here, ground based measurements of geomagnetic activity and solar wind measurements are used to data-mine 26 yr of magnetometer data from 22 Earth-orbiting satellites, which are then utilized to reconstruct the global magnetic field associated with X-lines in Earth’s magnetosphere. We show that these reconstructions pinpoint the reconnection locations by verifying their consistency with direct spacecraft observations.Key PointsGlobal structure of magnetotail reconnection inferred from data mining matches its locations revealed by in situ observationsReconstructed magnetotail reconnection structures include X- and O-lines and magnetic nullsReconstructed multiscale current sheet structure is consistent with its formation mechanism by quasi-adiabatic ion motions | |
dc.publisher | American Geophysical Union (AGU) | |
dc.publisher | Wiley Periodicals, Inc. | |
dc.subject.other | substorms and storms | |
dc.subject.other | X-line | |
dc.subject.other | thin current sheet | |
dc.subject.other | data-mining | |
dc.subject.other | magnetotail | |
dc.subject.other | reconnection | |
dc.title | Global Structure of Magnetotail Reconnection Revealed by Mining Space Magnetometer Data | |
dc.type | Article | |
dc.rights.robots | IndexNoFollow | |
dc.subject.hlbsecondlevel | Astronomy and Astrophysics | |
dc.subject.hlbtoplevel | Science | |
dc.description.peerreviewed | Peer Reviewed | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/175895/1/2022JA031066-sup-0001-Supporting_Information_SI-S01.pdf | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/175895/2/jgra57624.pdf | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/175895/3/jgra57624_am.pdf | |
dc.identifier.doi | 10.1029/2022JA031066 | |
dc.identifier.source | Journal of Geophysical Research: Space Physics | |
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dc.working.doi | NO | en |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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