Stochastic heating and acceleration of minor ions by Alfvén waves

Details Stochastic heating and acceleration of minor ions by Alfvén waves Stochastic heating and acceleration of minor ions by Alfvén waves

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3810103w&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 10, CiteID L10103

Physics

Plasma Physics

1

Interplanetary Physics: Solar Wind Plasma, Solar Physics, Astrophysics, And Astronomy: Corona, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Wave/Particle Interactions (2483, 6984)

Scientific paper

The present paper addresses the stochastic heating of minor ions by obliquely-propagating low-frequency Alfvén waves in the solar wind. An important characteristics of the stochastic heating is unearthed by means of test particle simulation. That is, when the wave amplitude exceeds some threshold condition for stochasticity, the time-asymptotic kinetic temperature associated with the minor ions becomes independent of the wave amplitude, and it always approaches the value dictated by the Alfvén speed, to wit, Tkin. ˜ mivA2/2. During the course of the heating process the minor ions gain a net average parallel speed, v$\parallel$ ˜ vA in the laboratory frame. These results are consistent with observations which find that minor heavy ions often move faster than the local protons with a speed roughly equal to the local Alfvén speed.

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