The velocity distribution of cometary hydrogen - Evidence for high velocities?

Details The velocity distribution of cometary hydrogen - Evidence for high velocities? The velocity distribution of cometary hydrogen - Evidence for high velocities?

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..104..197b&link_type=abstract

Icarus (ISSN 0019-1035), vol. 104, no. 2, p. 197-205.

Computer Science

5

Austin Comet, H Alpha Line, Hydrogen Atoms, Photodissociation, Signal To Noise Ratios, Solar Wind, Charge Exchange, High Speed, Interplanetary Dust, Iue, Velocity Distribution

Scientific paper

The Hamilton Echelle spectrograph on the 3-m Shane telescope at Lick Observatory was used to obtain high-velocity and spatial resolution 2D spectra of H-alpha 6563-A emission in Comets Austin and Levy. The presence of the components expected from water dissociation and collisional thermalization in the inner coma is confirmed by the hydrogen velocity distribution. In Comet Austin, the potential high-velocity hydrogen includes velocities of up to about 40 km/s and is spatially symmetric with respect to the nucleus. In Comet Levy, the high-velocity hydrogen reaches velocities of up to 50 km/s and is situated exclusively on the sunward side of the nucleus. The two distinct signatures of high-velocity hydrogen imply two distinct sources.

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