Torsional Alfvén Waves As Pseudo-Magnetic Flux Ropes

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Solar Wind, Interplanetary Magnetic Fields, Magnetohydrodynamics, Solar Magnetism, Particle Emission, Solar Wind, Interplanetary Magnetic Fields, Magnetohydrodynamics And Plasmas, Electric And Magnetic Fields, Solar Magnetism

Scientific paper

We examined two classes of the solar wind magnetic field variations which show well-ordered smooth rotations with time scales of 2-7 hours. In one class, the solar wind velocity changes in good correlation with the rotating magnetic field. It is shown that the torsional Alfvén wave model can explain the observed variations in this class. In another class, no significant correlation is seen between the magnetic field and the velocity. This class is interpreted by a flux rope model and taken as a small-scale magnetic flux rope. It is also shown that the observed magnetic field variations in the first class could be easily mistaken as small-scale magnetic flux ropes, if a careful analysis was not undertaken. The present study provides a baseline to distinguish the above two classes of rotational variations in the solar wind magnetic field.

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