Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ap%26ss..17..241t&link_type=abstract
Astrophysics and Space Science, Volume 17, Issue 1, pp.241-262
Astronomy and Astrophysics
Astrophysics
44
Scientific paper
The dynamics of jetstreams have been studied by following the evolution of a simulation particle population. The self-gravitational field of the stream has been neglected, the individual small bodies interacting through hard, partially inelastic collisions only, no fragmentation or accreaction taking place. The chosen collision model — the beta-model — is given by Equation (4). The collisions will quickly establish a Rayleigh distribution of both eccentricities and inclinations, the average amplitude of the oscillations associated with eccentricity being up by approximately a factor √2. The velocity distribution inside the stream is highly non-Maxwellian. If the collisions are sufficiently inelastic, the stream is focused, the individual orbits becoming more and more circular (for azimuthally symmetric streams) and ecliptic. In the opposite case the collisions destroy the stream configuration rapidly. The beta collisional model is unable to produce any radial focusing.
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