Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..674z&link_type=abstract
European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht
Physics
Scientific paper
Investigation of microwave emission from solar active regions has for the first time educed the effect of parametric resonance between 5-minute velocity oscillations in the solar photosphere and oscillations of coronal magnetic loops modulating the microwave radiation. The effect is evident as synchronous excitation of 5-, 10- and 3- minute oscillations in the coronal magnetic loop. These periods correspond to pumpup frequency, sub-harmonic and the first upper frequency of parametric resonance. Since 5-minute photospheric oscillations are reflected from temperature minimum and cannot directly penetrate into the corona, the parametric resonance may serve as an effective channel for photospheric oscillation energy transfer to the upper solar corona. It opens an important perspective to understanding the coronal heating mechanism.
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