Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3903k&link_type=abstract
American Astronomical Society, DPS meeting #40, #39.03; Bulletin of the American Astronomical Society, Vol. 40, p.466
Other
Scientific paper
Solar photon scattering probabilities (g-values) have been calculated for discrete transitions in 12 species, in a format designed primarily to allow analysis of observations from the UV spectrometers onboard the MESSENGER and Bepi Colombo spacecraft at Mercury. MESSENGER's MASCS, operates over the spectral range 1150 to 6000 A. Bepi Colombo's UV spectrograph, PHEBUS, has an extended lower range starting at 550 A to allow observation of He I at 584 A. Significant radial velocity dependence is shown for most of the emission lines, a critical factor for interpretation of the observed spectra. Due to its eccentric orbit, some g-values can vary by over an order of magnitude during Mercury's orbital period. Although a maximum of 20% variation is seen in the g-value for the 3081 OH band while varying temperature between 3000 to 15000 K, the MASCS spectral resolution is not high enough to resolve the difference. Species of interest include sodium, potassium, and calcium, which have been observed in Mercury's exosphere through ground-based observations, and hydrogen and oxygen, which were measured by the UV spectrometer on Mariner 10. In addition, sulfur, magnesium, carbon, OH, Ca+ and Mg+ have emission lines in the UV that are observable by the MESSENGER UVVS as well as Bepi-Colombo. The helium 584 A line will be observable by PHEBUS. Optical depth effects are probably not important for any of the species considered except for the Na D lines and the Mg 2853 A line. These lines are expected to be optically thick, thus a scattering code or curve of growth analysis will be essential to the interpretation of abundance as a function of intensity. These g-values will be applicable to other astronomical observations where emission is forced by solar radiation. RK and NM acknowledge funding from NASA MESSENGER Participating Scientist Grant NNX07AR78G.
Killen Rosemary Margaret
Mouawad Nelly
Shemansky Don E.
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