An Electromagnetic Drift Instability In the Lower Hybrid Frequency Range In Reconnection Region

Details An Electromagnetic Drift Instability In the Lower Hybrid Frequency Range In Reconnection Region An Electromagnetic Drift Instability In the Lower Hybrid Frequency Range In Reconnection Region

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53b0429j&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM53B-0429

Computer Science

Sound

7831 Laboratory Studies, 7835 Magnetic Reconnection, 7867 Wave/Particle Interactions

Scientific paper

By using a local two-fluid theory, we investigate an electromagnetic instability in the lower hybrid frequency range driven by cross-field current or relative drifts between electrons and ions. The theory self-consistently takes into account local cross-field current and accompanying pressure gradients. It is found that the instability is caused by reactive coupling between backward propagating whistler (fast) waves and forward propagating sound (slow) waves when the relative drifts are large. The unstable waves have mixed polarization with significant electromagnetic components, propagating obliquely to the unperturbed magnetic field. A physical picture of the instability emerges as a result of further simplifications of the model. The primary feedback mechanism is based on reinforcement of initial electron density perturbations by induced Lorentz force due to both field line bending and (de)compression. The resultant waves are qualitatively consistent with the measured electromagnetic fluctuations in reconnecting current sheet in a laboratory plasma. Detailed wave characteristics are also similar to measurements at reconnection sites of the magnetosphere. This work is supported by DOE, NASA, and NSF.

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