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Observations of the intensity of the penumbra of sunspots

โœ Scribed by P. Maltby

Publisher
Springer
Year
1972
Tongue
English
Weight
359 KB
Volume
26
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.

The relation between the intensities of
The relation between the intensities of umbra and penumbra of large sunspots
โœ G. Ekmann ๐Ÿ“‚ Article ๐Ÿ“… 1974 ๐Ÿ› Springer ๐ŸŒ English โš– 160 KB

Abstsact. Based on pinhole photometer observations in 4-6 wavelength regions 'gee have searched for a connection between the intensities of the umbra and the penumbra of sunspots. For the 1.67 pm wavelength region it is apparent that spots with dark umbrae also have dark penumbrae. In the other wave

A model for the penumbra of sunspots
A model for the penumbra of sunspots
โœ O. Kjeldseth Moe; P. Maltby ๐Ÿ“‚ Article ๐Ÿ“… 1969 ๐Ÿ› Springer ๐ŸŒ English โš– 482 KB
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