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Swept Forward Magnetic Field Variability in High-Latitude Regions of Saturn's Magnetosphere
File(s)
Author(s)
Davies, Ewen
Masters, A
Dougherty, Michele
Hansen, Kenneth
Coates, Andrew
Type
Journal Article
Abstract
Swept forward field is the term given to configurations of magnetic field wherein the field lines deviate from the meridional planes of a planet in the direction of its rotation. Evidence is presented for swept-forward field configurations on Cassini orbits around Saturn from the first half of 2008. These orbits were selected on the basis of high inclination, spatial proximity, and temporal proximity, allowing for the observation of swept-forward field and resolution of dynamic effects using data from the Cassini magnetometer. Nine orbits are surveyed; all show evidence of swept-forward field, with typical sweep angle found to be 23°. Evidence is found for transient events that lead to temporary dramatic increases in sweep-forward angle. The Michigan Solar Wind Model is employed to investigate temporal correlation between the arrivals of solar wind shocks at Saturn with these transient events, with two shown to include instances corresponding with solar wind shock arrivals. Measurements of equatorial electron number density from anode 5 of the Cassini Plasma Spectrometer instrument are investigated for evidence of magnetospheric compression, corresponding with predicted shock arrivals. Potential mechanisms for the transfer of momentum from the solar wind to the magnetosphere are discussed.
Date Issued
2017-12-26
Date Acceptance
2017-12-05
Citation
Journal of Geophysical Research: Space Physics, 2017, 122 (12), pp.12328-12337
URI
DOI
ISSN
2169-9380
Publisher
American Geophysical Union
Start Page
12328
End Page
12337
Journal / Book Title
Journal of Geophysical Research: Space Physics
Volume
122
Issue
12
Copyright Statement
©2017. American Geophysical Union.
All Rights Reserved
Sponsor
The Royal Society
Science and Technology Facilities Council (STFC)
Grant Number
UF150547
ST/P006922/1
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
PLANETARY PERIOD OSCILLATIONS
WIND DYNAMIC PRESSURE
SOLAR-WIND
ALIGNED CURRENTS
ULYSSES FLYBY
MODEL
ENCELADUS
SPECTROMETER
MAGNETOPAUSE
IONOSPHERE
Publication Status
Published
Date Publish Online
2017-12-11