The Pioneer 11 radio occultation measurements of the Jovian ionosphere
Abstract
Radio occultation data obtained with the Pioneer 11 spacecraft are utilized to study Jupiter's ionosphere. The ingress measurements, which were conducted by using a stable earth-based frequency reference for the tracking link, yielded ionospheric data near the morning terminator at about 79 deg south latitude. Data were also taken during egress on the evening side near 20 deg north latitude. The latter measurements were conducted in the one-way mode; i.e., an on-board crystal oscillator was employed as a frequency reference for the downlink (spacecraft-to-earth) signal. These data confirm previous results obtained with Pioneer 10 and show that Jupiter has a multilayered ionosphere extending over an altitude range of more than 3000 km. The topside scale height near 79 deg south latitude was 540 + or - 60 km. Assuming a topside electron, H(+) distribution controlled by diffusion yields a plasma temperature of 850 + or - 100 K in this region. The radio data indicate that the upper atmosphere is either warmer or more dissociated into atomic hydrogen than previously anticipated.
- Publication:
-
IAU Colloq. 30: Jupiter: Studies of the Interior, Atmosp here, Magnetosphere and Satellites
- Pub Date:
- 1976
- Bibcode:
- 1976jsia.coll..238F
- Keywords:
-
- Jupiter Atmosphere;
- Pioneer 11 Space Probe;
- Planetary Ionospheres;
- Radio Occultation;
- Atmospheric Stratification;
- Hydrogen Atoms;
- Plasma Diagnostics;
- Plasma Temperature;
- Spaceborne Astronomy;
- Lunar and Planetary Exploration