The radiation belts of Jupiter at 13 and 22cm. I. Observations and 3-D reconstruction.

Details The radiation belts of Jupiter at 13 and 22cm. I. Observations and 3-D reconstruction. The radiation belts of Jupiter at 13 and 22cm. I. Observations and 3-D reconstruction.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..274l&link_type=abstract

Astronomy and Astrophysics, v.319, p.274-281

Astronomy and Astrophysics

Astrophysics

19

Planets And Satellites: Jupiter, Continuum: Solar System, Techniques: Image Processing

Scientific paper

We present Australia Telescope observations of Jupiter in July 1995 at 13 and 22cm with a resolution of 3"x8" at 13cm and 5"x14" at 22cm. 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 2.9R_J_ at both 22 and 13cm, and the radiation extends to 4R_J_ 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 CML=~120°, located at System III longitude λ_III_=~210°. When it crosses the west limb, less than 180° later, the same spot is fainter. When the E-W brightness is plotted in terms of λ_III_, the ratio of east-to-west limb brightness takes on a simple, sinusoid-like form. The ratio is greater than unity in the λ_III_ range 180 to 40° for these observations, made at D_E_=-3.3°. In Paper II we relate the observations to the warping of the magnetic equator and obtain further insight into the magnetic field of Jupiter.

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