Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm14b..08o&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM14B-08
Physics
Plasma Physics
[2723] Magnetospheric Physics / Magnetic Reconnection, [2764] Magnetospheric Physics / Plasma Sheet, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [7846] Space Plasma Physics / Plasma Energization
Scientific paper
Nonadiabatic heating is of critical importance in many space plasma systems such as the solar atmosphere or planetary magnetospheres. Although nonadiabatic heating is somewhat understood in the framework of shocks it is not for more complex processes such as magnetic reconnection or Kelvin Helmholtz modes. Observations demonstrate that plasma transport from the magnetosheath into the magnetosphere must involve considerable nonadiabatic heating. Since this transport involves magnetic reconnection, it is critical to understand whether reconnection can also provide sufficient nonadiabatic heating consistent with the observations. It had been shown that significant nonadiabatic heating occurs only for rather small plasma beta in the simple case of Petschek reconnection. This result is generalized here and nonadiabatic effects are studied in more complex reconnection geometries using two-dimensional MHD and Hall MHD simulations. Nonadiabatic heating is identified in several regions of the reconnection geometry, and we discuss the physics and the importance of these heating processes compared to the heating required for the observed plasma transport. It is found that the plasma beta plays a critical role for nonadiabatic heating also in more general reconnection cases.
Ma Xiao
Otto Andreas
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