Jovian BHL Emissions Observed During the Ulysses-Jupiter Distant Encounter
Abstract
During the Ulysses-Jupiter near-encounter in 1992 several new components of Jovian radio emissions were discovered. One new component, called Bursty High-Latitude (BHL), was observed during Ulysses' brief excursion to high Jovian magnetic latitudes. This radiation component was characterized by its burstiness and its unique elliptical polarization. The northern BHL emissions, which were observed only briefly by Ulysses in 1992, were observed from high magnetic latitudes (>40o) and in the CML range from 135o to 240o. Since the recent 2003/2004 Ulysses-Jupiter distant encounter views Jupiter from high northern magnetic latitudes for an extended time period, it was anticipated that Ulysses might observe many episodes of BHL emission, which would help to further characterize this unique Jovian radiation and establish its possible relationship to other Jovian radio components. However, the relative paucity of these BHL emissions observed during the distant encounter suggests that they may require some triggering agent. Indeed, it is very interesting that the observed episodes of BHL emissions are often found to immediately precede major long-duration nKOM events, which are known to be triggered by interactions of the Jovian magnetosphere with the interplanetary sector structure. During the entire nKOM event there appears to be no further episodes of the BHL emissions. These results are reminiscent of our previous findings that Jovian bKOM emissions abruptly ceased just prior to long-duration nKOM events associated with the passage of sector boundaries.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2004
- Bibcode:
- 2004AGUSMSH23A..03R
- Keywords:
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- 5737 Magnetospheres (2756);
- 5757 Remote sensing;
- 6954 Radio astronomy