Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91..269h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 91, April 1984, p. 269-288. Research supported by the Science and Engineering Research Coun
Physics
29
Magnetohydrodynamic Waves, Resonance, Solar Atmosphere, Wave Propagation, Dissipation, Propagation Velocity, Wave Reflection
Scientific paper
It is noted in the present investigation of Alfven wave propagtion in a simple medium consisting of three uniform layers, each of which is characterized by a different Alfven speed value, that the central layer can, under general conditions, act as a resonant cavity. When this cavity is externally driven by an incident wave on one of the outer layers, resonant transmission peaks are generated which allow large energy fluxes to enter the cavity from outside. Two types of resonance are distinguished: one which occurs when the cavity has the largest or the smallest of the three Alfven speeds, as in coronal loops, and another which is generated when the cavity Alfven speed is intermediate between the two outer Alfven speed values, as may occur on solar spicules. It is also shown that if the energy lost to heat exceeds that lost through leakage out of the cavity, cavity heating can be independent of the damping rate.
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