Shear Alfvenic Disturbances in the Vicinity of Magnetic Null X-Points

Details Shear Alfvenic Disturbances in the Vicinity of Magnetic Null X-Points Shear Alfvenic Disturbances in the Vicinity of Magnetic Null X-Points

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...472..832h&link_type=abstract

Astrophysical Journal v.472, p.832

Astronomy and Astrophysics

Astronomy

13

Magnetohydrodynamics: Mhd, Sun: Magnetic Fields

Scientific paper

The dynamics of shear Alfvénic disturbances in the vicinity of two-dimensional magnetic null X-points is studied. The study complements recent work on compressional Alfvénic disturbances near X-points. For disturbances not straddling the separatrix, it is found that the shear Alfvén wave phase mixes rapidly. The damping rate, however, is not as large as [ln(1/n)]-2, as was found for magnetosonic disturbances (n is the resistivity). For low-frequency forced motions straddling the separatrix, sheet currents are formed at the separatrix and the current layer width is found to scale as n½. This results in a volumetric ohmic heating rate which also scales as n½.

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