At first it is shown that a magnetic field being force-free, i.e. satisfying V โข B = aB, with a = constant (ct r O) in the whole exterior of the Sun cannot have a finite energy content and cannot be determined uniquely from only one magnetic field component given at the photosphere. Then the boundar
The representation of magnetic field lines from magnetograph data
โ Scribed by Randolph H. Levine
- Publisher
- Springer
- Year
- 1975
- Tongue
- English
- Weight
- 310 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
โฆ Synopsis
Several methods currently used to extrapolate the structure of the solar magnetic field from surface measurements are examined and compared. In particular, the differences between the methods of Schmidt for potential fields and of Nakagawa and Raadu for force-free fields are explained. Suggestions are made regarding the use of these theoretical procedures in making physical conclusions. * These four planes are defined by the relations xo<x<xl, O<z< 0% y~yo; xo<x<xl, O<z< 0% y=yl; yo<y<yl, O<z< ~, x=xo; yo<y<yl, O<z< ~, x=xl.
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