Properties of sunspot umbrae observed in cycle 24

Author： Kiess Christoph   Rezaei Reza   Schmidt Wolfgang  

Publisher： Edp Sciences

E-ISSN： 1432-0746|565|issue|A52-A52

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.565, Iss.issue, 2014-05, pp. : A52-A52

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Abstract

Aims. There is an ongoing debate whether the solar activity cycle is overlaid with a long-term decline that may lead to another grand minimum in the near future. We used the size, intensity, and magnetic field strength of sunspot umbrae to compare the present cycle 24 with the previous one.

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