The physics of sunspots
โ Scribed by Cram, Lawrence E.; Thomas, John H.
- Book ID
- 109724027
- Publisher
- Nature Publishing Group
- Year
- 1981
- Tongue
- English
- Weight
- 279 KB
- Volume
- 293
- Category
- Article
- ISSN
- 0028-0836
- DOI
- 10.1038/293101a0
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๐ SIMILAR VOLUMES
By means of an inversion of H and K Ca II line profiles the temperature and electron density in the chromosphere above the umbrae of two sunspots have been estimated. The temperature gradient 5 K km -1 exceeds the corresponding values in both quiet regions and plages. At a height of about 1500 km th
Good quality photographs of many regular sunspots were obtained in three spectral regions, with the use of narrow band filters. Isodensity contours were used for measurements of the umbra and penumbra size along different axes of sunspots. A parameter based on the morphology of the whole sunspot was