New periodicity in Jovian decametric radio emission
Abstract
We report on the finding of a new periodicity in the Jovian decametric radio emission (DAM). Periodic bursts of non-Io component of DAM which recur with a period 1.5% longer than the Jupiter rotation (System III) have been found in the dynamic radio spectra acquired by STEREO/WAVES, Wind/WAVES and Cassini/RPWS during the years 2002-2008. Typically, the bursts appear very periodically over several Jovian days with a decreasing intensity and they display a negative frequency drift. All the bursts were detected within the same sector of Jovian Central Meridian Longitude (III), between 300° and 60° (via 360°) of CML (III), close to the region of the non-Io-C source. No correlation has been found with the position of Io. Considering the simultaneous stereoscopic observations onboard STEREO-A and STEREO-B, as well as Wind and Cassini we can conclude that the sources of the periodic bursts most probably sub-corotate with Jupiter.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- March 2010
- DOI:
- 10.1029/2010GL042488
- Bibcode:
- 2010GeoRL..37.5106P
- Keywords:
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- Planetary Sciences: Fluid Planets: Meteorology (3346);
- Planetary Sciences: Solar System Objects: Jupiter;
- Planetary Sciences: Fluid Planets: Aurorae;
- Planetary Sciences: Solar System Objects: Io