Sunspots Observed to Physically Weaken in 2000-2001

Details Sunspots Observed to Physically Weaken in 2000-2001 Sunspots Observed to Physically Weaken in 2000-2001

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..207...41l&link_type=abstract

Solar Physics, v. 207, Issue 1, p. 41-45 (2002).

Physics

19

Scientific paper

The `strength' of a sunspot depends on its magnetic field and umbral darkness, factors which go together. The strongest field in an umbra is always found at the darkest position. We use this relationship, B=f(1/T), to demonstrate that at the maximum of cycle 22 (1990-1991) sunspots were statistically stronger than at the same phase of cycle 23 (2000-2001). Within our sample of 195 spots, cycle 23 exhibits an excess of small bright spots, and possibly, a dearth of large dark spots. This could alter the total solar irradiance (TSI)-sunspot number relationship.

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