Magnetic Pinching of Hyperbolic Flux Tubes. I. Basic Estimations

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Abstract

The concept of hyperbolic flux tubes (HFTs) is a generalization of the concept of separator field lines for coronal magnetic fields with a trivial magnetic topology. An effective mechanism of a current layer formation in HFTs is proposed. This mechanism is called magnetic pinching, and it is caused by large-scale shearing motions applied to the photospheric feet of HFTs in a way as if trying to twist the HFT. It is shown that in the middle of an HFT such motions produce a hyperbolic flow that causes an exponentially fast growth of the current density in a thin force-free current layer. The magnetic energy associated with the current layer that is built up over a few hours is sufficient for a large are. Other implications of HFT pinching for solar flares are discussed as well.

Original languageEnglish
Pages (from-to)1172-1189
Number of pages18
JournalAstrophysical Journal
Volume582
Issue number2
DOIs
Publication statusPublished - 10 Jan 2003

Keywords

  • MHD
  • Sun : corona
  • Sun : flares
  • Sun : magnetic fields
  • QUASI-SEPARATRIX LAYERS
  • CURRENT SHEETS
  • SOLAR-FLARES
  • PARTICLE-ACCELERATION
  • ACTIVE REGIONS
  • RECONNECTION
  • FIELDS
  • POINTS
  • FLOWS
  • MODEL

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