The auroral O+ non-Maxwellian velocity distribution function revisited

Details The auroral O+ non-Maxwellian velocity distribution function revisited The auroral O+ non-Maxwellian velocity distribution function revisited

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997angeo..15..249h&link_type=abstract

Annales Geophysicae, vol. 15, Issue 2, pp.249-254

Physics

4

Scientific paper

New characteristics of <>O(+<) > ion velocity distribution functions in a background of atomic oxygen neutrals subjected to intense external electromagnetic forces are presented. The one dimensional (1-D) distribution function along the magnetic field displays a core-halo shape which can be accurately fitted by a two Maxwellian model. The Maxwellian shape of the 1-D distribution function around a polar angle of <>21+/- 1(deg<) > from the magnetic field direction is confirmed, taking into account the accuracy of the Monte Carlo simulations. For the first time, the transition of the <>O(+<) > 1-D distribution function from a core halo shape along the magnetic field direction to the well-known toroidal shape at large polar angles, through the Maxwellian shape at polar angle of <>21+/-1(deg<) > is properly explained from a generic functional of the velocity moments at order 2 and 4.

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