The Control of Saturn's Kilometric Radio Emission by Dione.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
Pagination or Media Count:
Observations of Saturns kilometric radio emissions obtained by the voyager 1 plasma wave receiver during the encounter of the Saturnian system in late 1980 reveal a strong but apparently transitory control by the orbital phase angle of Dione. At 56 kHz the effect of the Dione control is particularly evident during a two-week period centered roughly on closet approach. The intensity of the Saturnian emission is suppressed sharply when Dione is in the local dust sector. We propose that the transitory nature of the Dione control is actually a geometric effect and that a time-variable plasma torus associated with Dione can explain most of the observed details of the Dione modulation by creating a shadow zone near the equatorial plane. Author