Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2404d&link_type=abstract
American Astronomical Society, SPD meeting #40, #24.04; Bulletin of the American Astronomical Society, Vol. 41, p.861
Astronomy and Astrophysics
Astronomy
Scientific paper
We are currently observing the minimum phase of solar cycle 23. This has been a longer than average cycle, with a slow declining phase and an extended period of low activity lasting from about 2006 to the present. In 2008 there were 266 days without sunspots compared to 165 days in 1996, this was the largest number of spotless day per year reported since 1913.This long and extended minimum has been characterized by weak polar magnetic fields and a more complex corona morphology than observed during the previous two minima. Polar coronal holes were smaller and low-latitude coronal holes of significant size -usually seen during the declining phase- persisted into the minimum phase and continued to be important sources of the solar wind observed at the Earth. This shows that not all solar minima are alike and different magnetic configurations are possible during very quiet times. We will compare photospheric and coronal observations during the last two minima to illustrate these differences and will discuss some of their implication for the geospace environment.
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