Sodium D-line emission from Io - Synoptic observations from Table Mountain Observatory

Details Sodium D-line emission from Io - Synoptic observations from Table Mountain Observatory Sodium D-line emission from Io - Synoptic observations from Table Mountain Observatory

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...195l.131b&link_type=abstract

Astrophysical Journal, vol. 195, Feb. 1, 1975, pt. 2, p. L131-L135.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Spectroscopy, D Lines, Emission Spectra, Io, Periodic Variations, Synoptic Measurement, Astronomical Observatories, Jupiter (Planet), Planetary Radiation, Sodium

Scientific paper

We report the first results of a program initiated at Table Mountain Observatory to study the time variation of the sodium D-line emission around Io. During 1974 July and August, 51 spectra were obtained. These data demonstrate that (1) the sodium emission is highly correlated with Io's orbital position, (2) the gross temporal and amplitude characteristics of the emission are explained if resonance scattering of sunlight is the dominant excitation mechanism, (3) the emission is not directly related to dekametric noise storms from Jupiter, (4) an upper limit of 130 kR is placed on any constant near-surface (auroral) source of emission, (5) a steady-state source of sodium operated during our 7-week observing interval, (6) the sodium cloud is probably distributed in a partial toroid, possibly with more sodium leading than trailing Io, and (7) the D-line emission does not depend strongly on the solar phase angle.

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