Sunspot Umbra: Structure and Evolution

Details Sunspot Umbra: Structure and Evolution Sunspot Umbra: Structure and Evolution

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke2082v&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 2082. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Sun, Solar Activity

Scientific paper

Sunspots show two main structures: a central dark region, the umbra, surrounded by a brighter and filamentary zone, the SUNSPOT PENUMBRA (see figure 1 in the article on SUNSPOT EVOLUTION). Sunspots without penumbra are usually called SUNSPOT PORES. Observed with low spatial resolution, the umbra appears homogeneous. However, even by the nineteenth century astronomers were able to detect fine deta...

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