Questioning common wisdom on magnetic reconnection on issues of (i) anti-parallel vs component merging, (ii) 3D effects, and (iii) role of lower-hybrid drift instability

Details Questioning common wisdom on magnetic reconnection on issues of (i) anti-parallel vs component merging, (ii) 3D effects, and (iii) role of lower-hybrid drift instability Questioning common wisdom on magnetic reconnection on issues of (i) anti-parallel vs component merging, (ii) 3D effects, and (iii) role of lower-hybrid drift instability

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53b0414m&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM53B-0414

Physics

7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 2700 Magnetospheric Physics, 2724 Magnetopause, Cusp, And Boundary Layers

Scientific paper

Our recent work brings to question three generally accepted concepts on reconnection. (1) It has been thought that tearing mode always has its maximum growth at parallel propagation independent of the size of the guide field. We show that this is not the case. Further, we re-examine all previous theories of tearing saturation, both in the presence of absence of a guide field. We find no agreement with any of the previous theories. We present a new theory for nonlinear evolution of tearing that is verified by simulations. (2) There has been a rush to perform 3D full particle simulations and certain conclusions have been drawn regarding the relative role of various instabilities in reconnection onset. We show the issues with such simulations, including some of the conclusions that have been made. (3) Lower-hybrid drift instability (LHDI) has been considered for a long time as contributing to reconnection as a source of anomalous resistivity. As it turns out, LHDI can affect reconnection much stronger by creating a temperature anisotropy in the electrons within the sheet. A new model for reconnection is demonstrated.

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