Computer Science – Sound
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...50..343w&link_type=abstract
Solar Physics, vol. 50, Nov.-Dec. 1976, p. 343-360.
Computer Science
Sound
19
Chromosphere, Magnetoacoustic Waves, Solar Corona, Solar Magnetic Field, Wave Interaction, Differential Equations, Phonons, Sound Waves, Stellar Models, Temperature Distribution
Scientific paper
A previous study is extended which argued that Alfven waves traveling up a large coronal loop may heat this loop at the top and increase its visibility. This heating is now evaluated more completely, taking into account the changes along the loop in field strength, gas density, and flux of waves. The location and efficiency of the heating depend very nonlinearly on the intensity of the waves, which allows rapid changes in the visibility of a loop. Observational and theoretical conditions for the applicability of the theory are summarized. Alfven waves preferentially heat the upper portions of coronal helmets, but a measurable excess temperature on a loop requires somewhat implausibly high wave fluxes. Radiation losses from low-lying loops with strong magnetic fields cannot be explained without modifying the theory.
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