A time sequence of high-resolution sunspot photographs, exposed almost simultaneously in two continuum wavelengths (4680/~ and 6400 ~), was used to study some properties of umbral fine structures ('umbral dots'). The lifetime of the umbral dots is found to be 1500 sec. Photometry of some bright dots
The intensity, velocity and magnetic structure of a sunspot region
✍ Scribed by J. M. Beckers; E. H. Schröter
- Publisher
- Springer
- Year
- 1969
- Tongue
- English
- Weight
- 143 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
Zentralinstitut fiir Astrophysik der Akadcmic der Wissenschaftcn der DDR Sonneiiol~servatoriuin Einsteintnrni IVitli 5 f i p r e s (Rcceivctl 1984 Sovembrr 30) Multiple wavelength observations of sunspot umbrae can only be expalined by an inhomogeneous, two-component model for the structure of the u
Absolute intensities of emission lines in the wavelength range from 1200 A to 1817 A from the large sunspot in McMath region 12510 near Sun center are presented. The intensities are averaged across the umbra and penumbra of the sunspot. The observations were made with the NRL slit spectrograph on Sk