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Flux Transfer Events at a Reconnection- Suppressed Magnetopause: Cassini Observations at Saturn

dc.contributor.authorJasinski, Jamie M.
dc.contributor.authorAkhavan‐tafti, Mojtaba
dc.contributor.authorSun, Weijie
dc.contributor.authorSlavin, James A.
dc.contributor.authorCoates, Andrew J.
dc.contributor.authorFuselier, Stephen A.
dc.contributor.authorSergis, Nick
dc.contributor.authorMurphy, Neil
dc.date.accessioned2021-03-02T21:46:12Z
dc.date.available2022-03-02 16:46:10en
dc.date.available2021-03-02T21:46:12Z
dc.date.issued2021-02
dc.identifier.citationJasinski, Jamie M.; Akhavan‐tafti, Mojtaba ; Sun, Weijie; Slavin, James A.; Coates, Andrew J.; Fuselier, Stephen A.; Sergis, Nick; Murphy, Neil (2021). "Flux Transfer Events at a Reconnection- Suppressed Magnetopause: Cassini Observations at Saturn." Journal of Geophysical Research: Space Physics 126(2): n/a-n/a.
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/2027.42/166408
dc.description.abstractWe present the discovery of seven new flux transfer events (FTEs) at Saturn’s dayside magnetopause by the Cassini spacecraft and analyze the observations of all eight known FTEs. We investigate how FTEs may differ at Saturn where the magnetopause conditions are likely to diamagnetically suppress magnetic reconnection from occurring. The measured ion- scale FTEs have diameters close to or above the ion inertial length di- ¼1- 27 (median and mean values of 5 and 8), considerably lower than typical FTEs found at Earth. The FTEs magnetic flux contents are 4- 461 kWb (median and mean values of 16 and 77 kWb), considerably smaller (<0.1%) than average flux opened during magnetopause compression events at Saturn. This is in contrast to Earth and Mercury where FTEs contribute significantly to magnetospheric flux transfer. FTEs therefore represent a negligible proportion of the amount of open magnetic flux transferred at Saturn. Due to the likely suppression of the two main growth- mechanisms for FTEs (continuous multiple x- line reconnection and FTE coalescence), we conclude that adiabatic expansion is the likely (if any) candidate to grow the size of FTEs at Saturn. Electron energization is observed inside the FTEs, due to either Fermi acceleration or parallel electric fields. Due to diamagnetic suppression of reconnection at Saturn’s magnetopause, we suggest that the typical size of FTEs at Saturn is most likely very small, and that there may be more di- ¼1 FTEs present in the Cassini magnetometer data that have not been identified due to their brief and unremarkable magnetic signatures.Key PointsEight Saturn ion- scale flux transfer events (FTEs) are analyzed with diameters of di- ¼1- 27FTEs at Saturn are found to transfer negligible amounts of flux at Saturn’s magnetosphereEvidence for electron energization is observed inside some of the FTEs, due to either Fermi acceleration or parallel electric fields
dc.publisherWiley Periodicals, Inc.
dc.publisherSpringer
dc.subject.otherFTE
dc.subject.otherreconnection
dc.subject.otherSaturn
dc.subject.othermagnetopause
dc.subject.otherCassini
dc.titleFlux Transfer Events at a Reconnection- Suppressed Magnetopause: Cassini Observations at Saturn
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelAstronomy and Astrophysics
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/166408/1/jgra56227_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/166408/2/jgra56227.pdf
dc.identifier.doi10.1029/2020JA028786
dc.identifier.sourceJournal of Geophysical Research: Space Physics
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