Sigmoidal morphology and eruptive solar activity

Details Sigmoidal morphology and eruptive solar activity Sigmoidal morphology and eruptive solar activity

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..627c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 6, p. 627-630

Astronomy and Astrophysics

Astrophysics

265

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, And Astronomy: Corona

Scientific paper

Soft X-ray images of solar active regions frequently show S- or inverse-S (sigmoidal) morphology. We have studied the Yohkoh Soft X-Ray Telescope video movie for 1993 and 1997. We have classified active regions according to morphology (sigmoidal or non-sigmoidal) and nature of activity (eruptive or non-eruptive). As well, we have used NOAA sunspot areas for each region as a measure of size. We find that regions are significantly more likely to be eruptive if they are either sigmoidal or large.

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