Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70...25h&link_type=abstract
Solar Physics, vol. 70, Mar. 1981, p. 25-66.
Physics
139
Coronal Loops, Magnetohydrodynamic Waves, Solar Atmosphere, Solar Magnetic Field, Solar Physics, Linearization, Solar Corona, Wave Propagation
Scientific paper
The linearized propagation of axisymmetric twists on axisymmetric vertical flux tubes is discussed, and models corresponding to both open (coronal hole) and closed (active region loops) flux tubes are analyzed. For open flux tubes it is found that (1) with some reservations, the model can account for long-period (approximately 1 hr) energy fluxes that are sufficient to drive solar wind streams; (2) the waves can be predicted to exert ponderomotive forces on the chromosphere that are large enough to alter hydrostatic equilibrium or to drive upward flows; and (3) higher-frequency waves (of approximately 10 sec to a few min) can be predicted to carry energy fluxes that are adequate to heat the chromosphere and corona. For closed flux tubes, it is found that (1) long-period (approximately 1 hr) twists do not seem to be energetically capable of providing the necessary heating of active regions; (2) loop resonances occur as a consequence of waves being stored in the corona via reflections at the transition zones; and (3) the waves exert large upward and downward forces on the chromosphere and corona.
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