Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2242d&link_type=abstract
American Astronomical Society, DPS meeting #28, #22.42; Bulletin of the American Astronomical Society, Vol. 28, p.1149
Other
Scientific paper
We present an analysis of 2-D radio images, obtained with the VLA and WSRT telescopes at 20 and 90 cm. Steady State: We suggest that Amalthea's motion through Jupiter's magnetic field induces Alfv{e}n and/or whistler wings, leading to enhanced pitch angle scattering which produces the observed high latitude emission regions in the radio images. SL9 Impacts: A preliminary analysis of 20 and 90 cm images reveals: i) Strong East-West asymmetries were induced during the week of cometary impacts. Various ranges in Jovian longitude showed enhanced emission at different times, but longitudes between 250(deg) and 60(deg) were never enhanced in intensity relative to other longitudes. ii) The impact-induced asymmetry between the peaks in high-resolution VLA images lasts for less than 4 days, as expected from the energy dependent drift of synchrotron-radiating electrons. At low resolution, however, the induced asymmetry persists for at least a month after the impacts and continues to vary. We suggest that these variations are caused by electrons with small equatorial pitch angles. iii) The radiation peak which brightens is often displaced inwards, closer to Jupiter, suggesting radial diffusion of the high energy electrons to regions of greater magnetic field strength. iv) The East/West asymmetries appear to be the same at 20 and 90 cm wavelengths.
Brecht Stephen H.
de Pater Imke
Schulz Michael
Strom Richard G.
Sukumar S.
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