The Lifetime and Cell Size of the Granulation in Sunspot Umbrae
Open Access
- 1 January 1960
- journal article
- research article
- Published by CSIRO Publishing in Australian Journal of Physics
- Vol. 13 (2) , 139-144
- https://doi.org/10.1071/ph600139
Abstract
High quality photographs extending over a period of 2 hr 11 min have been obtained of the granulation in the umbra of a large sunspot. In agreement with earlier work, the mean cell size of the umbral granulation is found to be significantly less, and the lifetime considerably greater, than that of the photospheric granulation. Ten per cent. of the umbral granules last for over 2 hr.Keywords
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