Abstract
The totality of the results obtained in the VEGA, GIOTTO and SUISEI projects does not lend itself to interpretation within the old sublimation models of comet activity considering solar radiation as the sole source of energy. Among them are the systematic excess of the velocity and temperature of the gas escaping from the nucleus over the theoretical values, the outflow being concentrated in several ( ~ 12–15) narrow ( ~ 300 m in size at the nucleus) hypersonic jets carrying very large amounts of remarkably fine CHON dust and located along continuous lines on the nuclear surface, intense release from the nucleus or very close to it (≲2 × 103km) of CO (Q Co/Q H2 O = 0.05–0.2) with a smaller amount of CO2 (Q CO 2/ Q H2 O ≈ 0.015), large near-nucleus abundances of C, C+ (Q C/Q CO ≈ 0.29), etc.
The new observations, together with some earlier data still poorly understood (e.g. the appearance in the coma of large amounts of C3) can be accounted for by assuming the cometary ices to contain, apart from hydrocarbons, nitrogen-containing compounds, etc. also of free oxygen ( ~ 15 wt.%). Under these conditions, burning should occur in the products of sublimation under deficiency of oxidizer accompanied by the production of ‘soot’, ‘smoke’, etc. The burning should propagate under the surface crust and localize primarily at a few sites.
The presence of oxygen in cometary ices follows from a new eruption theory assuming the minor bodies of the Solar System to have formed in explosions of the massive ice envelopes saturated by electrolysis products on distant moonlike bodies of the type of Ganymede and Callisto.
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Drobyshevski, E.M. Combustion as the cause of comet P/Halley's activity. Earth Moon Planet 43, 87–99 (1988). https://doi.org/10.1007/BF00056730
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DOI: https://doi.org/10.1007/BF00056730