Grains spin-up by inverse Cerenkov effect

Details Grains spin-up by inverse Cerenkov effect Grains spin-up by inverse Cerenkov effect

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...119..117m&link_type=abstract

Astronomy and Astrophysics, vol. 119, no. 1, Mar. 1983, p. 117-123.

Physics

Plasma Physics

5

Cerenkov Radiation, Charged Particles, Cosmic Dust, Interstellar Matter, Particle Spin, Plasma-Particle Interactions, Angular Momentum, Electron Plasma, Interstellar Gas, Nonuniform Plasmas, Plasma Drift, Plasma Oscillations, Plasma Physics, Vlasov Equations

Scientific paper

A dust grain which spins and drifts through a plasma and carries a dipolar (perpendicular to the rotation axis) electric charge is considered. Calculations are made of the (Cerenkov) losses of the rotational motion due to plasma effects: when the grain is subsonic, the rotation is exponentially damped; but if the grain is slightly supersonic, the rotation is accelerated. The physics is similar to the Cerenkov damping or excitation of a moving oscillator. For typical interstellar parameters, the time-scale can be smaller than the typical grain dynamic time-scale. Thus, this effect can be relevant in the physics of grains. Possible applications include rotational bursting and grains alignment.

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