New Observations of Ganymede's Radio Emissions

Details New Observations of Ganymede's Radio Emissions New Observations of Ganymede's Radio Emissions

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p12b0505k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P12B-0505

Astronomy and Astrophysics

Astronomy

2732 Magnetosphere Interactions With Satellites And Rings, 2772 Plasma Waves And Instabilities, 5737 Magnetospheres (2756), 6954 Radio Astronomy

Scientific paper

One of the attributes of Ganymede's magnetosphere discovered during Galileo's initial flyby of the moon in 1996 was that, like other planetary magnetospheres, it is the source of radio emissions. The Ganymede radio spectrum comprises a series of narrowband emissions in the frequency range of 15 to 50 kHz. The total emitted power has been estimated to be about 83 W and the emissions could be detected to a range of about 20 Ganymede radii (R G). The generation mechanism is thought to be mode-conversion from electrostatic upper hybrid bands at the Ganymede magnetopause. Since the first Ganymede flyby, radio emissions similar to these have been observed during other flybys. However, during the approach to the G29 flyby, the radio emissions were observed quasi-periodically from distances as large as 1200 R G, or some 60 times farther than originally reported. Furthermore, the visibility of the Ganymede emissions is best when both Galileo and Ganymede are well above or below the magnetic equatorial plane, suggesting that the relatively high density Jovian plasma sheet restricts the propagation of the emissions. The extraordinary distance over which the emissions were observed on approach to the G29 flyby may be related to unusually intense electron cyclotron harmonic emissions on the anti-Jupiter facing hemisphere of the magnetosphere.

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