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The Explanation of Umbral Dot of Sunspot

Tong Yi, Du Jin-sheng   

  1. Department of Astronomy, Beijing Normal University
  • Received:1985-11-17 Revised:1900-01-01 Online:1986-08-24 Published:1986-08-24

Abstract: In this paper, the form of umbral dots of sunspot was satisfactorily explained by a mechanism of local perturbations in a magnetic tube of sunspot along with the theory of Petschek’s neutral sheet. On the other hand, the special properties of umbral dots of sunspot such as the temperature, magnetic field and its life-time were estimated by Petschek’s formulae. The obtained results were agreed fairly well with observations.

Key words: Mars exploration, Key technologies, Design features