Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l.123o&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Oct. 15, 1980, p. L123-L127.
Astronomy and Astrophysics
Astronomy
28
Comets, Solar Activity Effects, Solar Cycles, Ultraviolet Astronomy, Photoabsorption, Photoionization, Solar Flux, Comets, Gases, Ultraviolet, Flux, Wavelengths, Solar Cycle, Models, Ionization, Photodissociation, Resonance, Fluorescence, Scattering, Magnitude, Water, Carbon Monoxide, Bradfield Comet, Data, Observations, Analysis, Comparisons
Scientific paper
The effects on comet gas of variations in the solar ultraviolet flux during solar cycle 21 are discussed. The photoionization, photodissociation, and resonance fluorescence and scattering rates of individual atoms and molecules increase by factors ranging up to 4, leading to potential order of magnitude variations in emission-line fluxes between minimum and maximum solar activity. These effects are illustrated for H2O and CO. Recent observations of comet Bradfield (1979) are discussed, and it is suggested that comets appearing near solar maximum be extensively observed to provide information on the response of cometary gas to solar flux variations, which can be used to discriminate between cometary models.
Downey C. J.
Oppenheimer Michael
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