Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1093b&link_type=abstract
American Astronomical Society, DPS meeting #30, #41.P08; Bulletin of the American Astronomical Society, Vol. 30, p.1093
Astronomy and Astrophysics
Astronomy
Scientific paper
Doppler data from the Voyager 1 radio occultation of Titan were reprocessed in an attempt to detect an ionosphere. The original analysis (Lindal et al., 1983) provided only upper bounds on the peak electron density of 3000 cm(-3) (ingress: evening terminator) and 5000 cm(-3) (egress: morning terminator). The raw recordings were used to generate a longer baseline prior to occultation ingress (S-band and X-band data available) and after occultation egress (only S-band). The primary result was a positive detection of Titan's ionosphere with a maximum electron density of 2400+/-500 cm(-3) at an altitude of 1180+/-150 km. There is a hint that this main peak actually splits into two layers, as would be expected from numerical models of Titan's upper ionosphere that invoke both photoionization and energetic electron impacts. Convincing detections of the main ionospheric peak were also obtained using only the S-band data for both ingress and egress.
Asmar Sami W.
Bird Michael K.
Dutta-Roy Robindro
Rebold T. A.
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