Recursive reconnection and magnetic skeletons

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

By considering a simple driven model involving the resistive 3D MHD interaction of magnetic sources, it is shown that it is essential to know the magnetic skeleton to determine (1) the locations of reconnection, (2) type of reconnection, (3) the rate of reconnection, and (4) how much reconnection is occurring. In the model, two opposite-polarity magnetic fragments interact in an overlying magnetic field with reconnection, first closing and then opening the magnetic field from the sources. There are two main reconnection phases: the first has one reconnection site at which the flux is closed, and the second has three sites. The latter is a hybrid case involving both closing and reopening reconnection processes. Each reconnection site coincides with its own separator, and hence all reconnection is via separator reconnection. All the separators connect the same two nulls and thus mark the intersection between the same four types of flux domain. In the hybrid state, the two competing reconnection processes (which open and close flux connecting the same two source pairs) run simultaneously, leading to recursive reconnection. That is, the same flux may be closed and then reopened not just once, but many times. This leads to two interesting consequences: (1) the global reconnection rate is enhanced and (2) heating occurs for a longer period and over a wider area than in the single-separator case.

Original languageEnglish
Pages (from-to)1656-1665
Number of pages10
JournalAstrophysical Journal
Volume675
Issue number2
DOIs
Publication statusPublished - 10 Mar 2008

Keywords

  • MHD
  • Sun : magnetic fields
  • ELEMENTARY HEATING EVENTS
  • 2 FLUX SOURCES
  • 3-DIMENSIONAL NULL POINTS
  • KINEMATIC RECONNECTION
  • CURRENT SHEETS
  • ALIGNED CURRENT
  • SOLAR CORONA
  • TUBES
  • EVOLUTION
  • FIELDS

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