Application of a constant-alpha force-free field in a toroid to fit magnetic clouds
Abstract
Magnetic clouds are large interplanetary flux ropes. Commonly their magnetic field configuration is fitted by a constant-alpha force-free field in a cylinder (Lundquist solution). A characteristic feature of magnetic clouds is a large rotation of the magnetic field vector. In some cases, the rotation exceeds 180 degrees and it is interpreted as a signature that the flux rope is curved. Here fits by the above mentioned solution fail and another solution is needed, a constant-alpha force-free solution in a toroid. A rather complex exact analytical solution (Tsuji solution) is compared with approximate simpler ones and fits of several magnetic clouds are presented.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2009
- Bibcode:
- 2009AGUFMSH13B1514V
- Keywords:
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- 7513 SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY / Coronal mass ejections;
- 7524 SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY / Magnetic fields;
- 7833 SPACE PLASMA PHYSICS / Mathematical and numerical techniques;
- 7959 SPACE WEATHER / Models