Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..129...21d&link_type=abstract
Icarus, Volume 129, Issue 1, pp. 21-47.
Other
11
Scientific paper
Radio telescope observations taken with the VLA and WSRT during the period June-October 1994 show an East-West asymmetry which evolves over time. The E/W asymmetry is induced immediately following the first fragment impact of comet Shoemaker-Levy 9. Following an impact, enhancements are seen over a ~100 deg range of Jovicentric longitudes at lambda_III <~ lambda_impact. Not all impacts, however, induce longitudinal brightenings (large fragment G, for example, does not). The main radiation peak which brightened is usually displaced inward. However, the observed increase in flux density is much smaller than predicted from conventional radial diffusion models. The lower flux density is attributed to a loss of electrons due to pitch-angle scattering, field-aligned acceleration, and/or cross-L diffusion. We show that the observed time evolution of the radio intensity at each lambda_III must result from a combination of the effect of the impact process on the electrons and electromagnetic environment (change in electromagnetic forces through, e.g., the excitation of plasma waves), the particle drift around the planet, disappearance of particles in the loss cone, and absorption by! Jupiter's ring. During the week of the SL9 impacts, the high-latitude emissions increased 30-40% more than the main radiation peaks, and each of the four peaks fluctuated in intensity seemingly independent of the other three peaks, in contrast to what one would expect under equilibrium situations for electrons bouncing up and down the field lines. In contrast to the main radiation peaks, which return to normal within a couple of days after impact W, the high-latitude emissions continued to change for weeks after the last impact. We suggest that this may have been caused by enhanced cross-field diffusion due to the presence of high-altitude dust, and/or by pitch-angle scattering and cross-field diffusion of electrons triggered by long-lived plasma waves excited by the impacts, and/or by impact-induced changes in the Alfven wings from the moon Amalthea, through a change in the Alfven velocity.
Brecht Stephen H.
de Pater Imke
Strom Richard G.
van der Tak Floris
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