Global asymmetry of the Sun observed in the extreme ultraviolet radiation

Details Global asymmetry of the Sun observed in the extreme ultraviolet radiation Global asymmetry of the Sun observed in the extreme ultraviolet radiation

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..189z&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Computer Science

1

Sun: Euv Radiation, Irradiance, Eit

Scientific paper

We report on the observations of the solar luminosity variations in four SOHO/EIT bandpasses over the period 1996 - 2001. Contributions of coronal holes, intermediate brightness features, active regions and bright points are evaluated. We find that during the epoch of low activity a significant contribution to the longitudinal asymmetry, and thus to the 27-day variability of the solar EUV radiation, is produced by the numerous intermediate brightness elements that are globally distributed over large areas (up to 2/3 of the whole surface of the Sun) and generally correspond to the "quiet Sun". During the activity minimum the contribution of this component is comparable to the active regions contribution. The "quiet Sun" average brightness exhibits rotational modulation throughout half of the solar cycle observed by SOHO.

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