Magnetic Energy Conversion From Whistlers to Electrons

Details Magnetic Energy Conversion From Whistlers to Electrons Magnetic Energy Conversion From Whistlers to Electrons

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21b..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21B-01

Physics

7829 Kinetic Waves And Instabilities, 7831 Laboratory Studies And Experimental Techniques, 7835 Magnetic Reconnection (2723, 7526), 7846 Plasma Energization, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

The most important aspect of magnetic reconnection is the fast conversion of magnetic energy into particle energy. Fast reconnection is facilitated by two-fluid effects. In the Electron MHD regime (EMHD), magnetic energy is converted into electrons on whistler time scales. In the absence of collisions and inertial effects the heating mechanism is not obvious. Laboratory experiments observing efficient electron heating by nonlinear whistler modes will be presented. Electron energization occurs in magnetic null lines by inductive electric fields along the separator, irrespective of the null point topology (X or O type). A finite electron transit time through the null line provides an inertial "resistivity" which allows dissipation and electron heating. Note that simple electron acceleration (jetting) does not convert magnetic energy in EMHD. The heating is strongest (from 3eV to 30eV) and fastest in field topologies called "whistler spheromaks" [Phys. Rev. Lett. 99, 265005 (2007)]. The energized electrons have anisotropic distributions since secondary whistler instabilities are observed. Thus, intense whistlers with magnetic null lines efficiently heat electrons even on scales larger than the electron inertial length. Such phenomena may arise in strong whistler turbulence near the center of neutral sheets.
exp/research/PropertiesNonlinearWhistlers/index.html

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