Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2116k&link_type=abstract
American Astronomical Society, DPS meeting #28, #21.16; Bulletin of the American Astronomical Society, Vol. 28, p.1136
Other
Scientific paper
On December 5, 1995, shortly after the Galileo spacecraft was inserted into orbit, its S-band radio signal was occulted by Jupiter.During entry into occultation at a latitude of 24.3deg S and a solar zenith angle (SZA) of 88.6deg a narrow ionospheric peak of about 107,000 cm(-3) was observed at an altitude of about 870 km above the 1-bar level. During exit at a latitude of 42.8deg S and a SZA of 91.1deg a very broad peak of only about 20,000 cm(-3) was observed at an altitude of about 2,055 km. A subsidiary peak of about 4,000 cm(-3) was also observed at about 900 km. Seven previous radio occultation observations of the Jupiter ionosphere have been carried out with the Pioneer 10 and 11 and Voyager 1 and 2 spacecraft at latitudes ranging from 67deg S to 79deg N, and SZAs from 82deg to 98deg . A comparison of these observations with the Galileo results and with each other suggests that the main ionization peak in the Jupiter ionosphere occurs either in the vicinity of about 1000-km altitude or at about 2000 km. The maximum ionization is also observed to vary by about an order of magnitude. This suggests that there are two separate production mechanisms for the main peak of the Jovian ionosphere, such as photoionization and particle precipitation from the magnetosphere, which act at different levels in the upper atmosphere. Low peak densities (of the order of 20,000 cm(-3) ) were observed only at the Voyager 1 exit location (1deg N) and the Galileo exit (43deg S) which lies very close to the latitude of the Shoemaker-Levy 9 impacts. This suggests that the magnitude of the ionospheric peak is modified by material deposited from S/L-9 at 43deg S, and by infall of material from Jupiter's ring at the equator. This work was performed at the Jet Propulsion Laboratory, California Institute of Technology, and at Stanford University under NASA contracts and grants, as well as the NASA Goddard Spaceflight Center.
Asmar Sami W.
Flasar Michael F.
Herrera R. G.
Hinson David P.
Howard H. T.
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