Radio emission from Io

Abstract

view Abstract Citations (4) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio emission from Io de Pater, I. ; Jaffe, W. J. ; Brown, R. A. ; Berge, G. L. Abstract Radio observations of Io taken with the VLA at 2, 6, and 21 cm show flux densities of 11.6 + or - 0.2 mJy, and less than 0.5 mJy, respectively, where the latter is a 2 sigma upper limit. These flux densities correspond to Io disk brightness temperatures of T(b) (2 cm) = 98 + or - 17 K, T(b) (6 cm) = 85 + or - 16 K, and T(b) (21 cm) less than 400 K, respectively. These radio brightness temperatures are consistent with thermal emission expected from Io's surface on the basis of its infrared brightness temperature and its radio emissivity derived from radar studies. No evidence for nonthermal radio emission from Io is found, such as has been reported by Mingaliev et al (1979). By using a model for the generation of synchrotron emission at 21 cm by energetic electrons in a hypothetical Io magnetosphere, an upper limit of Io's dipole magnetic moment less than 2 x 10 to the 25th gauss/cu cm is found. Publication: The Astrophysical Journal Pub Date: October 1982 DOI: 10.1086/160350 Bibcode: 1982ApJ...261..396D Keywords: Io; Radio Astronomy; Brightness Temperature; Earth Magnetosphere; Nonthermal Radiation; Planetary Radiation; Radiant Flux Density; Synchrotron Radiation; Thermal Emission; Lunar and Planetary Exploration full text sources ADS |