Expanding haloes in cometary comae

Details Expanding haloes in cometary comae Expanding haloes in cometary comae

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.289..269i&link_type=abstract

Nature, vol. 289, Jan. 22, 1981, p. 269-271.

Other

6

Comet Heads, Halos, Astronomical Models, Comet Nuclei, Gas Jets, Halley'S Comet, Ideal Gas, Shock Waves, Surface Temperature, Volatility, Comets, Comae, Halos, Observations, Formation, Shock, Atmosphere, Outgassing, Modulation, Spin, Models, Halley Comet, Chemistry, Dynamics, Gases, Plasmas

Scientific paper

Possible mechanisms for the formation of the expanding concentric shells (haloes) and fans and jets observed in cometary comae are examined. It is shown that the propagation of shock pairs through the cometary atmosphere, driven by spin modulation of the outgassing rate from a nonuniform cometary surface, may account for the expansion of spherical haloes from comets. Possible energy sources for such explosive outbursts include chemical reactions involving free radicals or unstable molecules on the nuclear surface, the breakup of cometary grains, or the introduction of a small fraction of exothermic volatile material into the sublimating gas.

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