Radio images of Jupiter's synchrotron radiation at 6, 20, and 90 CM

Details Radio images of Jupiter's synchrotron radiation at 6, 20, and 90 CM Radio images of Jupiter's synchrotron radiation at 6, 20, and 90 CM

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..795d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Aug. 1991, p. 795-805. Research supported by University of California.

Astronomy and Astrophysics

Astronomy

22

Jupiter (Planet), Nonthermal Radiation, Radio Astronomy, Synchrotron Radiation, Very Large Array (Vla), Astronomical Spectroscopy, Brightness Distribution, Radiation Belts, Relativistic Electron Beams

Scientific paper

VLA observations of Jupiter's nonthermal radiation at wavelengths of 6, 20, and 90 cm are presented and compared. The spatial resolution in all images is 0.25 R(J) (R/J/ = Jovian radius). The brightness distribution of Jupiter is very similar at each of the three wavelengths, although the radiation peaks at 6 cm are at a slightly larger distance from Jupiter than those at the longer wavelengths. This is due to the higher rate of synchrotron radiation losses at the shorter wavelengths. Radial profiles through the images clearly show the presence of a 'shoulder' or flattening in the intensity at about 2.5 R(J) due to absorption effects by the satellite Amalthea. In addition, the so-called 'hot region' in Jupiter's radiation belts is clearly present at all three wavelengths: images of the planet at a cml (central meridian longitude) of about 30-40 deg show the radiation peak to the right of Jupiter to be much brighter than the peak at the left, while images at a cml of about 210-220 deg show the opposite. The difference in brightness between the two radiation peaks is similar at all three wavelengths.

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