Observations of Comet Halley at H-alpha and 6300 A

Details Observations of Comet Halley at H-alpha and 6300 A Observations of Comet Halley at H-alpha and 6300 A

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14...53k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Jan. 1987, p. 53-56.

Physics

6

H Alpha Line, Halley'S Comet, Visible Spectrum, Collimation, Coronas, Hydrogen Atoms, Lyman Beta Radiation, Photodissociation, Resonance Fluorescence, Comets, Halley, Earth-Based Observations, Telescope Methods, Spectra, Interferometry, Emissions, Hydrogen, Brightness, Optical Properties, Comet Nuceli, Procedure, Dissociation, Oxygen, Production Rate, Equipment, Wavelengths, Structure

Scientific paper

High spectral resolution measurements of Comet Halley at H-alpha and OD-1 were obtained in March, 1986 using a small aperture telescope with the Fabry-Perot interferometer at the Arecibo Observatory. It is suggested that the highly structured spectral signature observed at H-alpha is due to collimation of atomic hydrogen in the inner hydrogen corona, following photodissociation of parent species, and that the emission is due to resonance fluorescence of solar Lyman-beta radiation. A feature at 6300.8 A accompanying the OD-1 emission at 6300.3 A is attributed to NH2. For a 6-arcmin field of view, a brightness for the OD-1 emission of 260 + or - 50 rayleighs is found for both March 15 and 17.

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