Asymmetric flux loops in active regions, I

L. Van Driel-Gesztelyi, K. Petrovay

Research output: Contribution to journalArticle

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Abstract

We investigate asymmetries of bipolar sunspot groups. We find that the magnetic field distribution of simple bipolar sunspot groups is significantly asymmetrical: the polarity inversion line is usually nearer to the main following polarity spot than to the main preceding one. This asymmetry grows with the age of the sunspot group. We suggest that this asymmetry has a causal link with two long-established asymmetries- the one in the proper motions of young sunspots, the other in the relative stability of p and f spots. In our view, these asymmetries together indicate that emerging flux loops, making sunspot groups, are not symmetrical but tilted eastward. The tilt is presumably caused by drag forces due to radial differential rotation in subphotospheric layers. In this paper we present observational indications supporting this hypothesis.

Original languageEnglish
Pages (from-to)285-298
Number of pages14
JournalSolar Physics
Volume126
Issue number2
DOIs
Publication statusPublished - Apr 1990

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sunspots
sunspot
asymmetry
polarity
proper motion
tilt
drag
emerging
indication
inversions
magnetic field
magnetic fields

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Asymmetric flux loops in active regions, I. / Van Driel-Gesztelyi, L.; Petrovay, K.

In: Solar Physics, Vol. 126, No. 2, 04.1990, p. 285-298.

Research output: Contribution to journalArticle

Van Driel-Gesztelyi, L. ; Petrovay, K. / Asymmetric flux loops in active regions, I. In: Solar Physics. 1990 ; Vol. 126, No. 2. pp. 285-298.
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