𝔖 Bobbio Scriptorium
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Torsional oscillations of umbra and penumbra of sunspots

✍ Scribed by O. S. Gopasyuk

Book ID
111498158
Publisher
Allerton Press Inc
Year
2010
Tongue
English
Weight
251 KB
Volume
26
Category
Article
ISSN
0884-5913

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πŸ“œ SIMILAR VOLUMES

On the umbra-penumbra area ratio of suns
On the umbra-penumbra area ratio of sunspots
✍ P. N. Brandt; W. Schmidt; M. Steinegger πŸ“‚ Article πŸ“… 1990 πŸ› Springer 🌐 English βš– 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

The relation between the intensities of
The relation between the intensities of umbra and penumbra of large sunspots
✍ G. Ekmann πŸ“‚ Article πŸ“… 1974 πŸ› Springer 🌐 English βš– 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