Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........68s&link_type=abstract
PhD Dissertation, Wisconsin Univ. Madison, WI United States
Other
2
Austin Comet, Ion Production Rates, Photochemical Reactions, Solar Activity Effects, Astronomical Spectroscopy, Spectrum Analysis, Fabry-Perot Spectrometers, Light Curve, Spectral Resolution, Line Spectra, Image Analysis
Scientific paper
In April and May 1990 we conducted an extensive series of observations of comet Austin using a 150mm dual etalon Fabry-Perot spectrometer coupled to the 0.91m West Auxiliary of the McMath Solar Telescope at Kitt Peak, Arizona and obtained high spectral resolution (0.2 A) scans and images. The field of view (FOV) on the sky was 10.5. We used spatial images of comet Austin (OI)6300 A emission to deduce the distribution of cometary O(1D). The 10 km/s bandpass of the system allowed the measurement of the distribution with little contamination from airglow (OI)6300 A and cometary NH2 lines in the nearby spectrum. We modeled the results to determine that the solar maximum photodestruction lifetime of OH at 1 AU, tauOH,1AU, is (1.1 +/- 0.3) x 105 s, which is consistent with the theoretical value of 1.3 x 105 s. We used measurements of (OI)6300 A intensity from spectral scans to determine the O(1D) production rate, QO(1D) and its dependence on heliocentric distance Rh. Adopting a value for QH2O/QO(1D), we determined the H2O production rate, QH2O and compared it with the results of several other groups, as well as with the visual light curve. From scans of the H2O(+) (0,8,0) band spin doublets at 6158.64, 6158.86 A and 6146.80, 6147.38 A, we obtained average H2O(+) intensities and anti-sunward velocities for nine nights. We used these observations and a simple model to determine the ion production rate, qH2O+. Comparing these rates with QH2O, we determine that the detected tailward fluxes of H2O(+) ions were only a small fraction of the fluxes predicted by photoionization models. We attempted to obtained velocity resolved sequences of images ('datacubes') of both the 6158.8 and 6147.1 A doublets. This work presents our method, as well as why it did not produce useful results.
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