Magnetic reconnection in Saturn's magnetotail: a comprehensive magnetic field survey

Smith, A.W., Jackman, C.M. and Thomsen, M.F. (2016) Magnetic reconnection in Saturn's magnetotail: a comprehensive magnetic field survey Journal of Geophysical Research: Space Physics, n1-22. (doi:10.1002/2015JA022005).


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Reconnection within planetary magnetotails is responsible for locally energizing particles and changing the magnetic topology. Its role in terms of global magnetospheric dynamics can involve changing the mass and flux content of the magnetosphere. We have identified reconnection related events in spacecraft magnetometer data recorded during Cassini's exploration of Saturn's magnetotail. The events are identified from deflections in the north-south component of the magnetic field, significant above a background level. Data were selected to provide full tail coverage, encompassing the dawn and dusk flanks as well as the deepest midnight orbits. Overall 2094 reconnection related events were identified, with an average rate of 5.0 events per day. The majority of events occur in clusters (within 3 h of other events). We examine changes in this rate in terms of local time and latitude coverage, taking seasonal effects into account. The observed reconnection rate peaks postmidnight with more infrequent but steady loss seen on the dusk flank. We estimate the mass loss from the event catalog and find it to be insufficient to balance the input from the moon Enceladus. Several reasons for this discrepancy are discussed. The reconnection X line location appears to be highly variable, though a statistical separation between events tailward and planetward of the X line is observed at a radial distance of between 20 and 30RS downtail. The small sample size at dawn prevents comprehensive statistical comparison with the dusk flank observations in terms of flux closure.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1002/2015JA022005
ISSNs: 2169-9380 (print)
Organisations: Astronomy Group
ePrint ID: 393267
Date :
Date Event
3 March 2016Accepted/In Press
9 March 2016e-pub ahead of print
Date Deposited: 25 Apr 2016 11:16
Last Modified: 17 Apr 2017 03:23
Further Information:Google Scholar

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