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Magnetically driven flows in arched plasma structures.

E V Stenson1, P M Bellan

  • 1California Institute of Technology, Pasadena, 91125, USA. eve@caltech.edu

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Laboratory experiments show high-speed plasma flows in arched magnetic flux tubes. These flows lead to plasma transport and sustained collimation, consistent with magnetohydrodynamic (MHD) force predictions.

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Area of Science:

  • Plasma Physics
  • Magnetohydrodynamics (MHD)
  • Astrophysical Fluid Dynamics

Background:

  • Arched magnetic flux tubes are common in astrophysical plasmas, such as on the solar surface.
  • Understanding plasma transport and dynamics within these structures is crucial for astrophysical phenomena.
  • Previous models suggested plasma acceleration in such configurations, but experimental validation was limited.

Purpose of the Study:

  • To experimentally investigate high-speed plasma flows in arched magnetic flux tubes.
  • To determine the mechanisms responsible for plasma transport and collimation within these tubes.
  • To compare experimental findings with theoretical magnetohydrodynamic (MHD) models.

Main Methods:

  • Laboratory experiments were conducted using controlled magnetic flux tubes.
  • High-speed plasma flows were generated and measured from the footpoints of the arched tubes.
  • Plasma transport and axial collimation were analyzed as the flux tubes evolved.

Main Results:

  • High-speed plasma flows were observed originating from both footpoints of the arched magnetic flux tubes.
  • Significant bulk plasma transport into the flux tube was demonstrated.
  • Persistent axial collimation of the plasma was observed, even as the flux tube lengthened and kinked.
  • Measured flow velocities and collimation effects were in strong agreement with hoop force and MHD collimation models.

Conclusions:

  • Fundamental MHD forces, specifically hoop forces, effectively drive plasma acceleration and collimation in arched magnetic flux tubes.
  • The experimental results validate theoretical predictions for plasma behavior in these configurations.
  • These findings have implications for understanding plasma dynamics in similar open flux configurations, including those on the solar surface.