Model of an Electrodynamic Deceleration Event in Jupiter's Polar Thermosphere

Details Model of an Electrodynamic Deceleration Event in Jupiter's Polar Thermosphere Model of an Electrodynamic Deceleration Event in Jupiter's Polar Thermosphere

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.7308a&link_type=abstract

American Astronomical Society, DPS meeting #31, #73.08

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a simulation using the JIM (Jovian Ionospheric Model) in which the electrodynamic interaction between the planet's magnetosphere and ionosphere is represented as a time-dependent potential drop across the model auroral oval. We find that for realistically high (>= 100 kV) trans-auroral potentials, the flow of neutral thermospheric gas is strongly coupled to the motion of ions at the auroral ionization peak (at pressure ~ 0.1 mu bar). The neutral winds re-adjust rapdily to time-dependent changes in the potential and thus in the ionospheric current system. Our simulations indicate that this re-adjustment can be on timescales of the order of hours. Our results also show that significant variations in magnetospheric plasma flow, perhaps due to mass-loading events, are capable of producing observable changes in velocities in the Jovian ionosphere.

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