EUV Corona in Solar Cycle 23

Details EUV Corona in Solar Cycle 23 EUV Corona in Solar Cycle 23

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9207b&link_type=abstract

American Astronomical Society Meeting 210, #92.07; Bulletin of the American Astronomical Society, Vol. 39, p.209

Astronomy and Astrophysics

Astronomy

Scientific paper

Extreme-Ultraviolet Telescope (EIT) on board SOHO provides us with unique data since 1996 up to the present time. The solar corona in Extreme-Ultraviolet emissions is visible on the solar disk and demonstrates a good relationship with the magnetic activity (SOHO/MDI and NSO/Kitt Peak data).
We have analysed the EUV data from SOHO/EIT in four wavelengths (171A, 195A, 284A, and 304A), and constructed coronal synoptic maps for 1996-2006. This period practically covers the whole current cycle. The synoptic structure of the solar corona reveals significant changes in the coronal and magnetic topology during the cycle.
These studies support an idea about the important role of the solar corona in solar cycle. The magnetic energy release in the corona together with dynamo processes in the convective zone and in the photosphere (differential rotation, diffusivity and meridional circulation) are the parts of a common process, which produces the solar activity cycle.

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