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A model for the penumbra of sunspots

โœ Scribed by O. Kjeldseth Moe; P. Maltby

Publisher
Springer
Year
1969
Tongue
English
Weight
482 KB
Volume
8
Category
Article
ISSN
0038-0938

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๐Ÿ“œ SIMILAR VOLUMES

The intensity of the penumbra of large s
The intensity of the penumbra of large sunspots
โœ P. Maltby; N. Mykland ๐Ÿ“‚ Article ๐Ÿ“… 1969 ๐Ÿ› Springer ๐ŸŒ English โš– 359 KB

Simultaneous photoelectric observations of sunspot penumbrae at 5790, 6690, 8760 and 16700~ are presented. No change in penumbral intensity from spot to spot is found in a sample of 11 large sunspots.

On the umbra-penumbra area ratio of suns
On the umbra-penumbra area ratio of sunspots
โœ P. N. Brandt; W. Schmidt; M. Steinegger ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› Springer ๐ŸŒ English โš– 232 KB

The area ratio of umbra to penumbra (Au/Ap) was investigated for a series of 126 sunspots observed around the maximum of solar activity in 1980. Plotting log (Au) as function of log (Ap) a linear relation is obtained with a slope of 1.10, yielding an average ratio Au/Ap of 0.24 for small spots and o