On the behaviour of sunspots in solar plasma: sunspot decay

Major, B. (2005) On the behaviour of sunspots in solar plasma: sunspot decay. In: British-Romanian-Hungarian N+N+N Workshop for Young Researchers On Plasma- and Astrophysics: from laboratory to outer space Edited by I. Ballai, E. Forgács-Dajka, A. Marcu and K. Petrovay. Publications of the Astronomy Department of the Eötvös University (15). ELTE Sokszorosítóüzeme, Budapest, pp. 27-33.

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Abstract

There are two main fundamental achievements in connection with statistical studies of solar sunspots and sunspot groups. One of them is that the mean decay rates of sunspot groups are lognormally distributed, the other one is that the decay rate of sunpots is proportional to the relative radius of the spot. The preceding study is based on the Greenwich Photoheliographic Results (GPR), the latter one is based on the Debrecen Photoheliographic Results (DPR). Now the Debrecen Photoheloigraphic Data (DPD) will be used to verify the above achievements and discuss the usefulness of DPD for such statistical studies.

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