Jupiter's radiation belts: at the time of comet SL-9 and a year later

Details Jupiter's radiation belts: at the time of comet SL-9 and a year later Jupiter's radiation belts: at the time of comet SL-9 and a year later

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997p%26ss...45.1231d&link_type=abstract

Planetary and Space Science, Volume 45, Issue 10, p. 1231-1236.

Computer Science

3

Scientific paper

High resolution observations of Jupiter's radiation belts at 13 and 22 cm were made using the Australia Telescope Compact Array at the time of the comet impacts in 1994 and 1 yr after, in July 1995. During the week of impacts the flux of synchrotron emission increased by 25-30%, with 2-D images showing that the appearance of the radiation belts changed dramatically within 2 days after the first collision, but only in a limited range of longitudes. Concentrating on the region of maximum brightness near R ≈ 1.5 RJ and near the magnetic equator, it is shown that, during/after the collisions, the brightness temperature was 30%-100% higher at longitudes 80° <~ λIII <~ 330° than it was a year later when the belts had relaxed to their normal, pre-impact state. Using the observations of July 1995, 3-D images of the radiation belts have been constructed in which, near the magnetic equator, there is a smooth variation of brightness with longitude. In contrast, there are distinct bright patches at some longitudes in the 3-D images constructed from the data obtained during and a few days after the impacts, 18-28 July 1994. These bright patches are undoubtedly the result of individual impacts or groups of impacts. Although one-to-one identifications are uncertain, the brightest patch at λIII ≈ 160-220° is almost surely due to impact A or the group of impacts A-C-E. The longitudes of the bright patches are remarkably stable over many days, showing little if any drift around the planet. The radial distance of the peak brightness in the magnetic equator was smaller at most longitudes in 1994 than it was in 1995, with a maximum displacement of 0.1 RJ near λIII = 200° this suggests that a major effect of the comet impacts was to increase the rate of diffusion of relativistic electrons toward lower altitudes.

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