High resolution spectra of Io's neutral sodium cloud.
1992; EDP Sciences; Volume: 256; Issue: 1 Linguagem: Inglês
ISSN
1432-0746
AutoresG. Cremonese, N. Thomas, C. Barbieri, Claudio Pernechele,
Tópico(s)Planetary Science and Exploration
Resumo117 echelle spectra of Io's neutral sodium cloud have been taken during the 1988/89 Jupiter opposition. The spectra, which are catalogued herein, were taken at D-line wavelengths (5890 A and 5896 A) on 15 nights over a 5 month period and were centred on Io. In addition to the normal slow sodium cloud (line of sight velocities of 2−3 km/s), high velocity neutral sodium atoms have been observed on several occasions showing maximum line of sight velocities of around 80 km/s. Double peak structures in the velocity distribution have also been observed with peak differential column abundances at around 0 and 40 km/s
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