Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1115h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Sept. 1984, p. 1115-1117.
Physics
9
Auroral Zones, Electron Energy, Ion Temperature, Ionospheric Heating, Plasma-Particle Interactions, Conics, Electrostatic Waves, Ion Cyclotron Radiation, Particle Acceleration, Particle Trajectories
Scientific paper
It is pointed out that, in addition to previously considered microscopic aspects of ion perpendicular heating in the auroral region, the effect of mass-dependent resident times in a finite-length perpendicular heating region may be important. In a simple illustrative model, particles are assumed to enter upward into an auroral acceleration region of finite extent along B, in which both parallel electric fields and perpendicular heating exist. In this situation, the particle residence times vary with particle mass as M to the 1/2-power, so that, in addition to effects associated with species-dependent heating rates, the resultant perpendicular energization associated with residence time also varies as M to the 1/2-power. The residence time effect thus favors heating of heavier particles, and may therefore be of some importance in understanding the greater energization of oxygen over hydrogen that has been observed, and also why no electron conics have been observed.
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