Properties of sunspots in cycle 23 I. Dependence of brightness on sunspot size and cycle phase

Aims. In this paper we investigate the dependence of umbral core brightness, as well as the mean umbral and penumbral brightness on the phase of the solar cycle and on the size of the sunspot. Methods. Albregtsen & Maltby (1978, Nature, 274, 41) reported an increase in umbral core brightness fro...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 2007-04, Vol.465 (1), p.291-304
Hauptverfasser:	MATHEW, S. K, MARTINEZ PILLET, V, SOLANKI, S. K, KRIVOVA, N. A
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology
Online-Zugang:	Volltext
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