Influence of Hot Plasma Pressure on the Global Structure of Saturn's Magnetodisk

Details Influence of Hot Plasma Pressure on the Global Structure of Saturn's Magnetodisk Influence of Hot Plasma Pressure on the Global Structure of Saturn's Magnetodisk

2010-08-23

arxiv.org/abs/1008.3791v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

15 pages, 3 figures, accepted for publication in GRL

Scientific paper

10.1029/2010GL045159

Using a model of force balance in Saturn's disk-like magnetosphere, we show that variations in hot plasma pressure can change the magnetic field configuration. This effect changes (i) the location of the magnetopause, even at fixed solar wind dynamic pressure, and (ii) the magnetic mapping between ionosphere and disk. The model uses equatorial observations as a boundary condition-we test its predictions over a wide latitude range by comparison with a Cassini high-inclination orbit of magnetic field and hot plasma pressure data. We find reasonable agreement over time scales larger than the period of Saturn kilometric radiation (also known as the camshaft period).

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