Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p51a1417g&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P51A-1417
Physics
5739 Meteorology (3346), 6275 Saturn
Scientific paper
We present preliminary results of a new simulation of Saturn's polar wind. The results include new vertical ion and electron density profiles, fluxes, and net source rates. Our model solves the 13 moment gyrotropic transport equations. The gyration dominated assumption allows us to assume that the flow is field aligned, and justifies the use of a one dimensional model. Furthermore, the effect of solar zenith angle and optical depth on the solar flux is taken into account. While capable of modeling transient behavior, only steady state results are presented. Similarly, the ability to include field aligned currents is built into the model, but their effect is not yet studied. By combining polar wind model output with a global MHD simulation of the magnetosphere-ionosphere system, we are able to calculate the net ionospheric source due to the polar wind. Like Earth, we expect that Saturn's ionosphere is an important source of magnetospheric plasma. The recent arrival of Cassini is giving unprecedented amounts of data. The time is therefore ripe for an attempt to characterize the ionospheric source at Saturn, and this simulation will help further this objective.
Glocer A.
Gombosi Tamas
Hansen Klavs
Tóth Géza
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