Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247.1125t&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 1125-1140.
Astronomy and Astrophysics
Astrophysics
8
Astronomical Spectroscopy, Io, Jupiter (Planet), Potassium, Satellite Atmospheres, Clouds, Resonance Lines, Jupiter, Satellites, Io, Potassium, Clouds, Comparisons, Pressure, Spectrum, Solar Radiation, Ionization, Plasma Torus, Oxygen, Tellurium, Sodium, Observations, Data Reduction, Resonance, Intensity, Asymmetry, Wavelengths, Absorption, Data
Scientific paper
Io's potassium cloud exhibits spatial and temporal variations similar to those observed for Io's sodium cloud. Spectra from five apparitions show that the potassium cloud is elongated so that it extends forward from Io's leading, inner hemisphere and makes an angle with Io's orbit of 10-30 deg, slightly less than the angle for the sodium cloud. The potassium cloud is a long-lived phenomenon which undergoes periodic fluctuations in response to solar radiation pressure and the ionizing influence of Jupiter's plasma torus. These give rise to east-west and north-south asymmetry variations similar to those observed for the sodium cloud. Evidence for temporary jets of potassium streaming from Io have also been observed. These similarities with the sodium cloud suggest that both sodium and potassium are ejected from nearly the same regions of Io by the same physical mechanism.
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