Comparison of Laboratory Measurement of Electromagnetic Waves during Reconnection with Theory, Simulations and Space Observations

Details Comparison of Laboratory Measurement of Electromagnetic Waves during Reconnection with Theory, Simulations and Space Observations Comparison of Laboratory Measurement of Electromagnetic Waves during Reconnection with Theory, Simulations and Space Observations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh32b..05j&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH32B-05

Physics

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

Scientific paper

Magnetic reconnection plays an important role in determining the topology of magnetic fields in solar flares, solar wind interactions with Earth magnetosphere, and relaxation processes in laboratory plasmas. A major puzzle of magnetic reconnection concerns why the observed reconnection rates are much faster than predictions by classical theories such as the Sweet-Parker model. Recently new measurements in MRX (Magnetic Reconnection Experiment) have revealed presence of strong electromagnetic waves during fast reconnection in the low-collisionality regime. In this paper, the measured wave characteristics are compared to linear theories based on either simple models (e.g., local and two-fluid models) or more complete models (e.g., global and full kinetic models). Initial assessments suggest that the observed waves are consistent with the so-called Modified Two-Stream Instability driven by large drift speeds compared to the Alfven speed in high-beta plasmas. Comparisons with 3D nonlinear simulations as well as recent measurements by space satellites will be presented. This work is supported by DOE, NASA, and NSF.

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