Photoionization Rate of Atomic Oxygen

Details Photoionization Rate of Atomic Oxygen Photoionization Rate of Atomic Oxygen

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa23b..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA23B-01

Physics

7538 Solar Irradiance, 7549 Ultraviolet Emissions, 2423 Ionization Processes (7823)

Scientific paper

Accurate knowledge of the photoionization rate of atomic oxygen is important for the study and understanding of the ionospheres and emission processes of terrestrial, planetary, and cometary atmospheres. Past calculations of the photoionization rate have been carried out at various spectral resolutions, but none were at sufficiently high resolution to accommodate accidental resonances between solar emission lines and highly structured auto-ionization features in the photoionization cross section. A new version of the NRLEUV solar spectral irradiance model (at solar minimum) and a new model of the O photoionization cross section enable calculations at very high spectral resolution. We find unattenuated photoionization rates computed at 0.001 nm resolution are larger than those at moderate resolution (0.1 nm) by amounts approaching 20%. Allowing for attenuation in the terrestrial atmosphere, we find differences in photoionization rates computed at high and moderate resolution to vary with altitude, especially below 200 km where deviations of plus or minus 20% occur between the two cases.

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