[en] Measurement results for Halley comet neutral gas concentration obtained using Plazmag-1 device are analyzed. Numerical model, which describes sensibly the obtained distribution, where difference of concentration values at flying-up and departing parts of trajectory is explained by Sun radiation pressure force effect on comet neutral particles, is formed
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[en] Cases in which high-energy ions formed in the bow part of the front of a quasi-parallel shock wave have a stable velocity distribution function are examined. It is shown that the dissipation resulting from the cyclotron absorption of wave energy by these ions gives rise to an outgoing precursor of the shock wave which propagates far out in front. This precursor is in the form of rather intense magnetosonic waves. 6 references
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