On the nature of reconnection at a solar coronal null point above a separatrix dome

D. I. Pontin*, E. R. Priest, K. Galsgaard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)
2 Downloads (Pure)

Abstract

Three-dimensional magnetic null points are ubiquitous in the solar corona and in any generic mixed-polarity magnetic field. We consider magnetic reconnection at an isolated coronal null point whose fan field lines form a dome structure. Using analytical and computational models, we demonstrate several features of spine-fan reconnection at such a null, including the fact that substantial magnetic flux transfer from one region of field line connectivity to another can occur. The flux transfer occurs across the current sheet that forms around the null point during spine-fan reconnection, and there is no separator present. Also, flipping of magnetic field lines takes place in a manner similar to that observed in the quasi-separatrix layer or slip-running reconnection.

Original languageEnglish
Article number154
Number of pages10
JournalAstrophysical Journal
Volume774
Issue number2
DOIs
Publication statusPublished - 10 Sept 2013

Keywords

  • Magnetic reconnection
  • Magnetohydrodynamics (MHD)
  • Sun: corona
  • Sun: magnetic fields
  • 3-dimensional magnetic reconnection
  • Kinematic reconnection
  • Flux emergence
  • Current sheets
  • Topology
  • Field
  • Dynamics
  • Collapse
  • Flare
  • Spine

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