Abstract
view Abstract Citations (30) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Sodium D-line emission from Io: comparison of observed and theoretical line profiles. Carlson, R. W. ; Matson, D. L. ; Johnson, T. V. ; Bergstralh, J. T. Abstract High-resolution spectra of the D-line profiles have been obtained for Io's sodium emission cloud. These lines, which are produced through resonance scattering of sunlight, are broad and asymmetric and can be used to infer source and dynamical properties of the sodium cloud. In this paper we compare line profile data with theoretical line shapes computed for several assumed initial velocity distributions corresponding to various source mechanisms. We also examine the consequences of source distributions which are nonuniform over the surface of Io. It is found that the experimental data are compatible with escape of sodium atoms from the leading hemisphere of Io and with velocity distributions characteristic of sputtering processes. Thermal escape and simple models of plasma sweeping are found to be incompatible with the observations. Publication: The Astrophysical Journal Pub Date: August 1978 DOI: 10.1086/156341 Bibcode: 1978ApJ...223.1082C Keywords: D Lines; Io; Sodium; Spectral Line Width; Clouds; Gas Flow; Sputtering; Velocity Distribution; Lunar and Planetary Exploration; Io:Sodium Cloud full text sources ADS |
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