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The radiation belts of Jupiter at 13 and 22 cm
I. Observations and 3-D reconstruction
Y. Leblanc 1,
G.A. Dulk 1, 2,
R.J. Sault 3 and
R.W. Hunstead 4
Received 11 April 1996 / Accepted 17 June 1996
We present Australia Telescope observations of Jupiter in July 1995 at 13 and 22 cm with a resolution of at 13 cm and at 22 cm. Images averaged over 10 days of observation clearly show the two populations of energetic electrons, one concentrated at the magnetic equator, and the other reaching high latitudes. The average separation between the east and west limb peaks is 2.9 at both 22 and 13 cm, and the radiation extends to 4 with good signal to noise.
A 3-D reconstruction of the belts is presented, showing vividly the warping of the magnetic equator as manifested in the radiation belts around the planet, and in the mirror regions at high latitudes.
From a series of images at different longitudes, the E-W brightness distribution as a function of CML is shown in a new way, demonstrating how the brightness on the two sides of the belt changes with Jupiter rotation. The bright spot crosses the east limb when , located at System III longitude . When it crosses the west limb, less than later, the same spot is fainter.
When the E-W brightness is plotted in terms of , the ratio of east-to-west limb brightness takes on a simple, sinusoid-like form. The ratio is greater than unity in the range 180 to for these observations, made at . In Paper II we relate the observations to the warping of the magnetic equator and obtain further insight into the magnetic field of Jupiter.
Key words: planets and satellites: Jupiter continuum: solar system techniques: image processing
Send offprint requests to: Y. Leblanc
Online publication: July 3, 1998