A method for analysing the stability of cylindrical loops and arcades to ballooning modes is presented. Using a WKB method, simple tests for instability (or stability to localised modes) are obtained for the two commonly used, line tying, conditions. In addition, when instabilities are present, the
Physical conditions in the corona for a bipolar magnetic region
β Scribed by Joan A. Vorpahl
- Publisher
- Springer
- Year
- 1978
- Tongue
- English
- Weight
- 943 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0038-0938
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β¦ Synopsis
We have used the S-056 X-ray data from Skylab to determine quantitative values for the coronal conditions characterizing a new bipolar magnetic region (BMR). In particular, we include: (a) the time variation of the total soft X-ray flux from the BMR as a function of time; (b) the temporal and spatial variation of the temperature and emission measure; (c) the variation with time of thermal energy density; (d) the (calculated) magnetic field configuration and magnetic flux density in the corona; and (e) the temporal variation of the magnetic field energy in the corona. Detailed comparisons are made between the configuration of X-ray features and the magnetic field topology.
π SIMILAR VOLUMES
The spectrum of the solar corona obtained during the eclipse of 7 March, 1970 has been studied. From the analysis of the line halfwidths it is concluded that the emission of coronal lines of various groups arises in different volumes of the corona. The lines 15303 and 14231 are analyzed in detail an
## Abstract A theory of magnetic afterβeffect is reconstructed by using a new model in which the reversible and irreversible magnetizations are separately taken into account. Rayleigh's law is employed for the expression of the reversible and irreversible magnetizations. Influence of magnetic after