Whistler Instabilities Excited by Electron Energization During Field Line Annihilation

Details Whistler Instabilities Excited by Electron Energization During Field Line Annihilation Whistler Instabilities Excited by Electron Energization During Field Line Annihilation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1429s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1429

Physics

2723 Magnetic Reconnection (7526, 7835), 7526 Magnetic Reconnection (2723, 7835), 7852 Solitons And Solitary Waves (4455)

Scientific paper

An oscillating current (ω ~eq 2 π × 0.2~MHz~~eq 10-2 ωc,0) in a magnetic loop antenna, immersed into a uniformly magnetized laboratory plasma, induces two whistler spheromaks with electron current rings, which propagate away from the antenna along the background magnetic field B0. The electrons in the current layer are strongly accelerated. Due to the nonuniform field and low collisionality, the electron distribution is generally non-Maxwellian. Under these conditions, the spontaneous excitation of higher frequency whistler modes with B_wave>B0 is observed (ω/2 π \approx 7~MHz, vphase~eq 130~cm/μs). These magnetic oscillations detach from the whistler spheromak and propagate along and oblique to the ambient magnetic field. Their space-time dependence, spectra, and parameter dependence have been measured. Probable instability mechanisms include temperature anisotropies (T\perp > T∥) and parallel electron beams. These oscillations may contribute to the generation of whistler turbulence in neutral sheets. Work suppported by USAF Materiel Command and NSF PHY.

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