Variation in sunspot properties between 1999 and 2011 as observed with the Tenerife Infrared Polarimeter
R. RezaeiKiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, GermanyC. BeckDepartamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, SpainW. SchmidtKiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany
2012en
ABI
Abstract
Aims. We study the variation in the magnetic field strength and the umbral intensity of sunspots during the declining phase of the solar cycle No. 23 and in the beginning of cycle No. 24.
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Cited by 20 references