Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13f..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13F-03
Physics
[5737] Planetary Sciences: Fluid Planets / Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn
Scientific paper
The existence of separate northern and southern periodicities in both radio emissions and in the polar B field is a crucial feature to be explained in any overall description of Saturnian magnetospheric dynamics. It is argued that the relatively narrow band nature of the northern and southern periodicities and the magnetic polarization indicate the periodicity are imposed separately from northern and southern polar regions, i.e. open field line regions. However, it is also argued that the power that sustains the signals comes from a circulation system that transports ionized material from the inner magnetosphere ultimately to interplanetary space. Magnetometer data from both the Cassini polar passes of 2008-9 and the post-equinoctial 2009-2011 period are used to illuminate and sustain the argument. It is concluded that the slow variation in signal period and amplitude is seasonal and associated with changes in the coupling of field lines in the polar caps to the underlying atmosphere. The site of the "cam" source currents at invariant latitude ~70° is attributed to there being where the dipole field no longer dominates in equatorial regions and the field is distended by solar and centrifugal effects. The underlying basis of the phenomenon is thus an effect of ionospheric-magnetospheric coupling but does not depend on any specific neutral atmosphere flow structure being present.
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