Forced reconnection, current sheets, and coronal heating

Xiaogang Wang, A. Bhattacharjee

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The formation of current sheets in the solar corona is investigated by a simple model in which forced reconnection occurs due to the perturbation caused at the photospheric boundary by footpoint motion. The time dependence of the process is considered by means of an initial-value calculation. It is found that on the Alfvénic time scale, current sheets tend to develop with an amplitude that increases linearly with time. The effect of resistivity becomes important subsequently, and the reconnected flux at the separatrix increases quadratically with time. In the nonlinear phase, helicity-conserving islands support current sheets, and the rate of reconnection is given by a modified Sweet-Parker model. Implications for coronal heating are discussed.

Original languageEnglish (US)
Pages (from-to)371-377
Number of pages7
JournalAstrophysical Journal
Volume401
Issue number1
DOIs
StatePublished - Dec 10 1992

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • MHD
  • Sun: corona
  • Sun: magnetic fields

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