Narrow-band IPD images of cometary CN and C2 - The effect of solar activity on coma scales

Details Narrow-band IPD images of cometary CN and C2 - The effect of solar activity on coma scales Narrow-band IPD images of cometary CN and C2 - The effect of solar activity on coma scales

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..693m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 15, 1992, p. 693-704. Research supported by S

Other

8

Carbon, Chemical Composition, Cometary Atmospheres, Cosmochemistry, Cyanogen, Solar Activity Effects, Halley'S Comet, Narrowband, Scale Height, Solar Cycles, Solar Planetary Interactions, Vibrational Spectra

Scientific paper

Results are presented of observations of Comet Halley and other cometary targets performed between August 1985 to May 1990. Near-nucleus studies were carried out using 1-m and 24-in telescopes, and large-scale structures were investigated by means of wide-angle camera lenses. The CN parent scalelength was approximately two times larger during solar minimum conditions than during solar maximum conditions and scaled approximately as the heliocentric distance in both cases. During solar maximum conditions the C2 parent scalelength scaled as the heliocentric distance raised to the power of 1.75. During solar maximum conditions, the CN scalelength scaled as the square of the heliocentric distance, confirming the usual assumption that the destruction of the CN radical is controlled by the solar flux of radiation. During solar maximum conditions, for Comet Austin, the CN scalelength appeared to scale as the square root of the heliocentric distance. Evidence for a significant heliolatitude dependence of the CN scalelength is inferred from this anomalous result.

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