Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5135.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5135. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Sun, Solar Activity
Scientific paper
The periodic increase and decrease in the number of sunspots and sunspot groups on the surface of the Sun. The number of spots and groups reaches a maximum, on average, once every 11 years. At the intervening sunspot minima, the solar disk may be devoid of spots for weeks on end. On average, the rise to maximum activity takes 4 to 5 years and the subsequent decline to the next minimum, about 6 to...
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