𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Oscillatory motions in an active prominence

✍ Scribed by B. Vršnak; V. Ruždjak; R. Brajša; F. Zloch

Publisher
Springer
Year
1990
Tongue
English
Weight
789 KB
Volume
127
Category
Article
ISSN
0038-0938

No coin nor oath required. For personal study only.

✦ Synopsis

Different types of oscillatory motions were detected in the late phases of eruption of a prominence.

We found oscillations of the prominence axis and diameter with periods of 4.3 and 9.1 min, corresponding to the eigenmodes m = 4 and m = 8 with a damping factor 4.6 x 10 -3 s -1. A period about 4.5 min was found for oscillations of the pitch angle of the helically twisted filaments. The m = 2 and m = 3 eigenmodes could be also identified and they led to the final relaxation of the prominence axis. The observations are compared with a model in which we consider forces acting in a curved, cylindrical magnetic tube anchored at both ends in the photosphere and carrying an electric current. The stability of the prominence is discussed.

📜 SIMILAR VOLUMES

Motions in a loop prominence
Motions in a loop prominence
✍ M. M. Makhmudov; G. M. Nikolsky; Yu. D. Zhugzhda 📂 Article 📅 1980 🏛 Springer 🌐 English ⚖ 879 KB

Motions of loop prominence knots have been studied on Ha-line filtergrams. By making use of contours of equal photographic density for entire cinegram it has been possible to significantly decrease the error in determining the locations of the knots. The method of mean velocities has been developed,

Oscillatory motions in sunspots
Oscillatory motions in sunspots
✍ J. M. Beckers; R. B. Schultz 📂 Article 📅 1972 🏛 Springer 🌐 English ⚖ 601 KB

We observe vertical velocity oscillations in some sunspot umbrae with periods of about 180 s and peak to peak amplitudes up to 1 km s -1. These oscillations are not visible in either the line depth, line width or the continuum intensity. No correlation seems to exist between the occurence of these o

Macroscopic motions in prominences
Macroscopic motions in prominences
✍ Hugo Grossi Gallegos; Marcos E. Machado 📂 Article 📅 1973 🏛 Springer 🌐 English ⚖ 647 KB

We have studied three pairs of prominences, two of them clearly showing the effect of interaction by a dynamical plasma bridge. The other one was a superimposed optical pair which also showed, after being spectroscopically studied, the possible effect of interaction. We have calculated the atom dens