Variation of the radio emission of Jupiter at 21.3 and 6.2 CM wavelength

Details Variation of the radio emission of Jupiter at 21.3 and 6.2 CM wavelength Variation of the radio emission of Jupiter at 21.3 and 6.2 CM wavelength

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..353g&link_type=abstract

Astronomy and Astrophysics, vol. 50, no. 3, Aug. 1976, p. 353-360.

Astronomy and Astrophysics

Astrophysics

16

Jupiter (Planet), Microwave Emission, Periodic Variations, Planetary Radiation, Radiant Flux Density, Synchrotron Radiation, Electron Energy, Harmonic Analysis, Inner Radiation Belt, Nonthermal Radiation, Outer Radiation Belt, Pioneer 11 Space Probe, Planetary Magnetic Fields, Radio Bursts, Satellite Observation

Scientific paper

The long-term variations and morphology of the synchrotron emission of Jupiter at 21.3 and 6.2 cm are examined, and the results of 21 cm flux density measurements obtained by Pioneer 11 during its flight around Jupiter from Nov. 3, 1974 through Jan. 3, 1975 are discussed. Few variations were noted at 6 cm between 1966 and 1974. At 21 cm, a large decrease in flux density (1966-1972) was followed by a significant rise. Observations suggest that before 1968, a large fraction of the 21 cm emission came from the inner part of the radiation belt where the gamma index of the differential electron energy spectrum is greater than 2.5. During the 1972-73 minimum, the nonthermal emission at 21 and 6 cm originated mainly from the outer portion of the belt (gamma index about 1.2). The Pioneer 11 data reveal at least two bursts of about one week's duration; it is suggested that these may contribute to maintaining the electron fluxes in the inner belt.

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