Propagation of Compressive Waves through Fibril Magnetic Fields. III. Waves that Propagate along the Magnetic Field

Details Propagation of Compressive Waves through Fibril Magnetic Fields. III. Waves that Propagate along the Magnetic Field Propagation of Compressive Waves through Fibril Magnetic Fields. III. Waves that Propagate along the Magnetic Field

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..896b&link_type=abstract

Astrophysical Journal v.318, p.896

Astronomy and Astrophysics

Astronomy

12

Hydromagnetics, Sun: Magnetic Fields, Sun: Oscillations, Sun: Sunspots

Scientific paper

An isothermal fibril magnetic field composed of a uniform distribution of parallel magnetic flux tubes embedded in an unmagnetized fluid is shown to support compressive modes that propagate along the flux tube axes with phase velocities below the sound speed. These modes are simply the familiar tube waves of a single isolated magnetic flux tube that are modified by the presence of the many individual flux tubes that constitute the fibril magnetic field. This modification is worked out for an ensemble of randomly placed parallel magnetic flux tubes distributed uniformly throughout all space. The net effect is to reduce the phase velocity to a value below that of a single isolated flux tube. These modes derive their existence from the presence of the many interfaces that separate the magnetic and nonmagnetic media, and are obviously absent in a uniformly magnetized medium that is free of inhomogeneities. It is suggested that observations of oscillation spectra at the solar surface may provide an important indirect direction of unresolved magnetic fibrils in active regions and plage on the Sun.

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