Mathematics – Probability
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41b1668i&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM41B-1668
Mathematics
Probability
2753 Numerical Modeling, 2756 Planetary Magnetospheres (5443, 5737, 6033), 2772 Plasma Waves And Instabilities (2471), 6220 Jupiter, 7534 Radio Emissions
Scientific paper
It is widely believed that non-Io-DAM is auroral radio emission from the Jovian aurora. We have analyzed non-Io-DAM occurrence dependence from 4 MHz to 16 MHz based on the System III central meridian longitude (CML) and calculated the occurrence probability for each frequency by using the Cassini RPWS data during Cassini's Jupiter flyby. As a result of this analysis, the two peaks of non-Io-B and non-Io-A occurrence probability showed a dramatic change in longitude between 9 MHz and 16 MHz. At 16 MHz two peaks of probability occurred at 160° and 240° CML. As the frequency decreases to 9 MHz, the two peaks converged to become one peak near 205° CML at 9 MHz. This peak gradually disappeared below 9 MHz. Based on Jupiter's magnetic VIP4 model, an angular beaming model was made to explain these observational results by taking into account the decreasing cone half-angle of the emitting cone from 16 MHz down to 9 MHz. By using our model we found the active magnetic flux tubes of non-Io-B and non-Io-A sources are localized at about 180° ± 10° of System III longitude projected on Jupiter's surface. Our results are close to the longitudinal values of previous observations of UV aurora phenomena. The close relationship between non-Io-DAM emission and the UV aurora can be considered.
Higgins Charles A.
Imai Koji
Imai Motoharu
Thieman James R.
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