MHD Waves in Open Magnetic Structures

Details MHD Waves in Open Magnetic Structures MHD Waves in Open Magnetic Structures

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..184..243n&link_type=abstract

Third Advances in Solar Physics Euroconference: Magnetic Fields and Oscillations, ASP Conference Series vol.184, p. 243-247. Eds

Physics

Mhd Waves, Coronal Holes, Coronal Heating, Solar Wind Acceleration

Scientific paper

The dynamics of Alfvén and magnetoacoustic waves of finite amplitude in open magnetic structures is considered. A transversal inhomogeneity in the magnetic structure in the density and/or in a field-aligned steady flow gives rise to Alfvén wave phase mixing, which, in the almost collisionless and dissipationless plasma of the corona, nonlinearly generates obliquely propagating fast magnetoacoustic waves. The generated fast waves are more effectively damped than the Alfvén waves and so the process of heating by phase mixing is enhanced. This "indirect" heating leads to the spreading of the heated plasma across the magnetic field. We point out also that an inhomogeneous flow gives rise to the secular generation of longitudinal motions through Alfvén wave phase mixing, accelerating the plasma along the field.

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