Dependence of Mercurian Atmospheric Column Abundance Estimations on Surface-Reflectance Modeling
✍ Scribed by Deborah L. Domingue; Ann L. Sprague; Donald M. Hunten
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 290 KB
- Volume
- 128
- Category
- Article
- ISSN
- 0019-1035
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✦ Synopsis
conditions, such as clouds near the horizon. The disadvantage, one of the points emphasized in this paper, is that Column abundance estimates of sodium, and analogously, the brightness of the surface is somewhat uncertain. Calipotassium, in Mercury's exosphere are strongly correlated to the surface reflection model used to calibrate the spectral data and bration against a standard star may be preferable for obserthe surface reflection model incorporated into the atmospheric vations from a spacecraft, but not from the ground.
radiative transfer solution. Depending on the surface reflection Regardless of the methodology used for the calibration model parameters used, there can be differences in calibration and column abundance determinations, the surface reflecfactors of up to ؎30% and differences in estimated column abuntion theory used in the mercurian atmosphere literature is dance of up to ؎35%. Although the surface reflectance may not Hapke's model (Hapke 1981(Hapke , 1984(Hapke , 1986)). Our study focuses be used in the calibration of spacecraft measurements, the interon the effects of the choice of Hapke model parameters on action between the reflected surface light and the atmospheric the calculated column abundances of Na in Mercury's atmobrightness remains important.