Sodium D-line emission from Io - A second year of synoptic observation from Table Mountain Observatory

Details Sodium D-line emission from Io - A second year of synoptic observation from Table Mountain Observatory Sodium D-line emission from Io - A second year of synoptic observation from Table Mountain Observatory

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211l..51b&link_type=abstract

Astrophysical Journal, vol. 211, Jan. 1, 1977, pt. 2, p. L51-L55.

Astronomy and Astrophysics

Astrophysics

13

D Lines, Emission Spectra, Io, Radiant Flux Density, Sodium, Molecular Spectra, Spectral Line Width

Scientific paper

Measurements of sodium D-line emission from Io are reported which were made during synoptic patrols of the 1975 and 1974 apparitions. Corrected equivalent widths of the D lines are plotted against the satelliite's orbital phase reckoned from superior heliocentric conjunction, and quantitative results of selected patrol observations are provided. The results indicate that: (1) resonant scattering is most likely the dominant emission mechanism; (2) the mechanism which injects neutral sodium into the space immediately around Io underwent no major secular variation in the period between the two apparitions; (3) a less pronounced asymmetry between the peak emission rates at 90-deg and 270-deg orbital phases is present in the selected data; and (4) the measured D2/D1 intensity ratios are consistent with a value of 1.6 + or - 0.3, which corresponds to a value of the order of unity for the maximum optical depth possible for resonant scattering the D1 line center. It is suggested that an unexplained scatter of about 20% in the general emission levels is due to a variation in the ionization rate.

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