Heating of coronal holes by phase mixing.

Details Heating of coronal holes by phase mixing. Heating of coronal holes by phase mixing.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...318..957h&link_type=abstract

Astronomy and Astrophysics, v.318, p.957-962

Astronomy and Astrophysics

Astrophysics

33

Mhd, Waves, Sun: Corona

Scientific paper

A two-dimensional, analytical, self-similar solution to the Alfven wave phase mixing equations is presented for a coronal hole model. The solution shows clearly that the damping of the waves with height follows the scaling predicted by Heyvaerts & Priest at low heights, before switching to an algebraic decay at large heights. The ohmic dissipation is calculated and it is shown that the maximum dissipation occurs at a height that scales with η^1/3^. However, the total Ohmic dissipation is, of course, independent of the resistivity. Using realistic solar parameters it appears that phase mixing is a viable mechanism for heating the lower corona provided either the frequency of photospheric motions is sufficiently large or the background Alfven velocity is sufficiently small.

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