✦ LIBER ✦

Umbral boundaries, convection, and the depth of sunspots

✍ Scribed by Philip A. Isenberg

Publisher: Springer
Year: 1976
Tongue: English
Weight: 609 KB
Volume: 50
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00206189

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

The depth of sunspots

✍ Th. Prokakis 📂 Article 📅 1974 🏛 Springer 🌐 English ⚖ 630 KB

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

The study of umbral flashes in the umbra

The study of umbral flashes in the umbrae of two sunspots

✍ I. P. Turova; R. B. Teplitskaja; G. V. Kuklin 📂 Article 📅 1983 🏛 Springer 🌐 English ⚖ 786 KB

The spectrum of umbral oscillations of t

The spectrum of umbral oscillations of the Scheuer-Thomas sunspot model

✍ V. I. Zhukov; V. I. Efremov; B. T. Nuraliev 📂 Article 📅 1987 🏛 Springer 🌐 English ⚖ 232 KB

Proper periods are calculated for oscillations of an isothermal gaseous layer with a homogeneous vertical magnetic field, limited by two rigid horizontal boundaries. The obtained results are in good agreement with the observed umbral oscillations in a sunspot.

Some aspects of turbulence structure thr

Some aspects of turbulence structure through the depth of the convective boundary layer

✍ S. J. Caughey; S. G. Palmer 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 890 KB

## Abstract Results from a series of boundary layer measurements carried out at Ashchurch, Worcestershire during July 1976 are combined with those from the 1973 Minnesota experiment. This data set provides a more complete description of the behaviour of some turbulence statistics through the depth

Convective instability and overstability

Convective instability and overstability in the sunspot umbra

✍ Mamoru Saitō; Shoji Kato 📂 Article 📅 1968 🏛 Springer 🌐 English ⚖ 607 KB

Convective instability and overstability of a plane-parallel medium in the presence of a uniform vertical magnetic field is studied. We take into account both the effect of penetration of disturbances into sub-adiabatically stratified semi-infinite upper and lower layers, and the effect of thermal d

Sunspot bright rings and the thermal dif

Sunspot bright rings and the thermal diffusivity of solar convection

✍ L. A. Fowler; P. Foukal; T. Duvall 📂 Article 📅 1983 🏛 Springer 🌐 English ⚖ 644 KB

We have used the 512 channel diode array and vacuum telescope at KPNO to study the photospheric intensity distribution around sunspots, for comparison with isotherms predicted by convective blocking models of heat flow. Raster scan observations of 10 spots on 18 days were carried out in 1980 and 198