Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23b1611s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM23B-1611
Astronomy and Astrophysics
Astronomy
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2774] Magnetospheric Physics / Radiation Belts, [6220] Planetary Sciences: Solar System Objects / Jupiter, [6954] Radio Science / Radio Astronomy
Scientific paper
Radio measurements provide the only method for currently investigating Jupiter's relativistic electron energy distribution, and constraining theoretical models of processes responsible for the electron distributions in the inner magnetosphere. Radio observations also carry important information regarding the dynamics of Jupiter's radiation belts and their link to magnetospheric and solar activities. In the past, the analysis of Jupiter's synchrotron data sets demonstrated that the Jovian radiation zones exhibit important temporal variability on time-scales ranging from weeks to years. In this paper, we present the first observation of short-term variations of Jupiter's radiation-belt emission obtained with interferometric measurements. Over a two-month period of observational time in 2002, we have monitored the Jovian synchrotron emission with the Very Large Array (VLA). The images constructed at the wavelength of 6 cm demonstrate significant changes in the spatial structure of the brightness distribution. The radiation peak was observed to shift back and forth from one side of the planet to the other on a time-scale of days. We will then discus the results of the analysis of the VLA 2002 campaign and demonstrate how the short-term variability can manifest in brightness distribution variations as a function of Jovian system III longitude. We will present the preliminary results of our VLA 2009 campaign to further examine the regions where the fluctuations are generated. Finally, we will discuss our modeling effort to investigate the process responsible for short-term changes in Jupiter's radiation-belt emission likely taking place in the Jovian ring's innermost component.
Bolton James S.
Levin Mark Sh.
Mansergh Thorne Richard
Santos-Costa Daniel
Sault Robert J.
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