Heating and Deceleration of Differentially Streaming Ions Among Nonlinear Waves

Details Heating and Deceleration of Differentially Streaming Ions Among Nonlinear Waves Heating and Deceleration of Differentially Streaming Ions Among Nonlinear Waves

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21c..05v&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH21C-05

Physics

7827 Kinetic And Mhd Theory, 7843 Numerical Simulation Studies, 2109 Discontinuities, 2149 Mhd Waves And Turbulence

Scientific paper

Coronal and solar wind ions show important kinetic behavior. First, we examine the behavior of minor ions which stream differentially relative to protons. With increasing distance in the solar wind, minor ions decelerate. We have found from hybrid simulations with particle ions and fluid electrons that streaming Helium and Oxygen ions can be decelerated among Alfvén waves which have steepened and produced imbedded RDs. We have examined the causes of this deceleration. We have eliminated demagnetization within RD layers as a cause. Moreover, we have found reflecting ions near RDs, but these do not explain why the bulk of ions decelerate. At present, we have identified a source of nonequilibrium among two and half dimensional (2(1)/(2)-D) waveforms in which the generalized Reynolds stresses are unbalanced at RD layers when minor ions are included in simulations but are balanced when only protons are simulated. This might explain why minor ions fail to find an equilibrium within the simulated waveforms. We compare the expectations of this theory with simulation results at a various streaming streaming speeds and for minor ions of differing charge to mass ratio. Furthermore, we also compare behavior with 1(1)/(2)-D imbedded RDs where the generalized Reynolds stresses vanish identically. A second hybrid study is carried out examining minor ion and proton heating among potentially resonant waves produced by a cascade.

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