Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm24a..07s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM24A-07
Physics
7827 Kinetic And Mhd Theory, 7843 Numerical Simulation Studies, 6220 Jupiter, 2451 Particle Acceleration, 2704 Auroral Phenomena (2407)
Scientific paper
One of the most interesting of the Jovian auroral processes is highly sporadic radio emissions from Jupiter's magnetosphere that extend from 10 kHz to 33 MHz while most of the powerful decametric emissions observed between 15 and 27 MHz occur within two ranges of Central Meridian Longitude (CML). The duration of these pulses varies from 200 ms to 1 ms, hence, they referred to as S-bursts. An Alfv´ en eigenmode, called the ionospheric Alfv´ en resonator, can develop between the conducting boundary of Jupiter and the exponential increase in Alfv´ en velocity on the topside of ionosphere. A Vlasov code is used to provide density profiles along the Jupiter-Io flux tube while a gyrofluid model will be used to study the propagation of Alfv´ en waves. With this effort, we are attempting to examine whether the Alfv´ en resonator in Jupiter's ionosphere may be associated with the periodicity of S-bursts. Alfv´ enic fluctuations may be partially (or mostly) reflected by the large density gradient near Io's torus. We will calculate the percentage of the wave power that reaches high latitudes of Jupiter through the use of our gyrofluid code.
Bagenal Fran
Delamere Peter A.
Ergun Robert E.
Jones Tim S.
Parker Scott E.
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