Electric Currents in a Unipolar Sunspot

  1. C. T. Russell,
  2. E. R. Priest and
  3. L. C. Lee
  1. A. A. Pevtsov and
  2. N. L. Peregud

Published Online: 21 MAR 2013

DOI: 10.1029/GM058p0161

Physics of Magnetic Flux Ropes

Physics of Magnetic Flux Ropes

How to Cite

Pevtsov, A. A. and Peregud, N. L. (1990) Electric Currents in a Unipolar Sunspot, in Physics of Magnetic Flux Ropes (eds C. T. Russell, E. R. Priest and L. C. Lee), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM058p0161

Author Information

  1. SibIZMIR, Irkutsk 33, P.O. Box 4026, 664033 USSR

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780875900261

Online ISBN: 9781118663868

SEARCH

Keywords:

  • Solar photosphere;
  • Magnetic flux;
  • Astrophysics

Summary

A study is made of longitudinal electric currents of a unipolar sunspot (NOAA No. 4744). The pattern of longitudinal currents in the sunspot umbra indicates the presence of a common current system with predominance of the tangential component. The direction of this component, together with the sunspot's polarity, suggests the conclusion that currents flowing in the umbra sustain, at least, the sunspot magnetic field. The Lorentz force that is calculated in cylindrical symmetry is directed largely in radius out of the sunspot and exceeds considerably the horizontal gas pressure gradient. The nature of electric currents is discussed.