Neptune's microwave spectrum from 1 MM to 20 CM

Details Neptune's microwave spectrum from 1 MM to 20 CM Neptune's microwave spectrum from 1 MM to 20 CM

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...80....1d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 80, July 1989, p. 1-13. Research supported by the Alfred P. Sloan Foundation.

Astronomy and Astrophysics

Astronomy

13

Microwave Spectra, Neptune (Planet), Planetary Radiation, Ammonia, Atmospheric Models, Brightness Temperature, Radiant Flux Density, Synchrotron Radiation, Thermal Radiation, Very Large Array (Vla), Neptune, Microwaves, Spectra, Flux, Density, Brightness, Temperature, Comparisons, Atmosphere, Emissions, Ammonia, Abundance, Radiation, Magnetic Fields, Particles, Distribution, Astronomy, Thermal Properties, Radio Methods, Earth-Based Observations, Procedure, Imagery

Scientific paper

Total flux densities and disk-averaged brightness temperatures have been tabulated on the basis of VLA observations of Neptune at 1.3, 2, 6, and 20 cm wavelengths; a recalibration is also conducted of previous observations in order to accurately ascertain the spectral shape of this planet, which is found to have increasing brightness temperature with increasing wavelength, in contrast with that of Uranus. If all the detected emission is atmospheric thermal radiation, ammonia abundance must either be a factor of about 50 lower than the solar N value throughout the Neptune atmosphere, or the planet must emit about 0.3-0.5 mJy synchrotron radiation at 20 cm; the latter possibility is consistent with a planetary magnetic field strength of about 0.5 G at the surface.

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