dispersive waves and magnetic reconnection alex flanagan (university of wisconsin) j. f. drake...
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![Page 1: Dispersive Waves and Magnetic Reconnection Alex Flanagan (University of Wisconsin) J. F. Drake (UMD), M. Swisdak (UMD)](https://reader036.vdocument.in/reader036/viewer/2022070403/56649f2f5503460f94c488b5/html5/thumbnails/1.jpg)
Dispersive Waves and Magnetic Reconnection
Alex Flanagan (University of Wisconsin)J. F. Drake (UMD), M. Swisdak (UMD)
![Page 2: Dispersive Waves and Magnetic Reconnection Alex Flanagan (University of Wisconsin) J. F. Drake (UMD), M. Swisdak (UMD)](https://reader036.vdocument.in/reader036/viewer/2022070403/56649f2f5503460f94c488b5/html5/thumbnails/2.jpg)
Magnetic Reconnection?
• Magnetic energy converted to kinetic and thermal energy
• Occurs in solar corona, magnetosphere, laboratory plasma experiments, and even at edge of solar system
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Generalized Ohm’s Law
Hall term = whistler wavesElectron pressure gradient = kinetic Alfvén waves
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Dispersive WavesLinear waves: Dispersive waves:
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Sweet-Parker v Fast Reconnection
Reconnection Rate
Sweet-Parker reconnection:
Fast reconnection:
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PIC SimulationsKinetic Particle-in-Cell Simulations
Look for:• Size and scaling of dissipation region• Scaling of reconnection rate• Actual reconnection rate of system
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Conclusions
• Magnetic reconnection is fast in parameter regimes where dispersive waves are possible
• There is not a sharp transition between fast and slow reconnection
• The parameters we use are similar to those found in solar wind and solar corona
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References• Birn, J. et al “Geospace Environmental Modeling (GEM) Magnetic Reconnection Challenge”
Journal of Geophysical Research (2001)
• Cassak, P. “Catastrophe Model for the Onset of Fast Magnetic Reconnection” Phd Thesis (2006)
• Mandt, M. “Transition to Whistler Mediated Magnetic Reconnection” Geophysical Research Letters (1994)
• Rodgers, B. “Role of Dispersive Waves in Collisionless Magnetic Reconnection” Physical Review Letters (2001)
• Shay, M. “Two-Scale Structure of the Electron Dissipation Region Collisonless Magnetic Reconnection” Physical Review Letters (2007