Evolution of near UV Halley's spectrum in the inner coma

Details Evolution of near UV Halley's spectrum in the inner coma Evolution of near UV Halley's spectrum in the inner coma

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..525r&link_type=abstract

In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 525-528 (SEE N93-19113 06-90)

Physics

Cometary Atmospheres, Emission Spectra, Halley'S Comet, Photodissociation, Hydroxyl Emission, Photons, Resonance Fluorescence, Water Vapor

Scientific paper

A direct way to observe the photodissociation of water vapor in a cometary coma is to detect the OH prompt emission. This emission is shifted of delta lambda = 4 nm with respect to the OH 309 nm fluorescence band. The extended data set obtained with the three-channel spectrometer on-board Vega 2 reveals at short distance of the nucleus (i.e., less than 600 km) an excess of emission on the right wing of the OH band which may be interpreted as being mainly due to prompt emission.

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