Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm54a..01h&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM54A-01
Physics
2728 Magnetosheath, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling
Scientific paper
An analysis of anisotropic pressure (p_\perp ≠ p_∥) evolution is carried out based on the hybrid code simulation described by Lin et al. [JGR, vol. 106, 10,691, 2001]. The simulation models the response of anisotropic pressure to convective flows in a compressed magnetosheath, and includes the effect of pitch angle scattering due to ion cyclotron waves. Normally, Ion cyclotron waves lead to an exchange of pressure energy from p_\perp to p_∥ [Denton et al., JGR, vol. 99, 11,225, 1994]. In this study, we try to model the effects of two-way energy exchange (allowing for exchange of energy from p_∥ to p_\perp) and the parallel heat flux. We find that these two effects do make a significant difference in the pressure evolution for this simulation. These results show the inadequacy of fluid equations to model the hybrid code results. However, the effects we have examined here may not be as significant in the real magnetosheath, because the hybrid code simulation does not have a realistic separation of timescales.
Denton R.
Hu Yan
Lin Yangtin
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