High-frequency coronal oscillations and coronal heating

Details High-frequency coronal oscillations and coronal heating High-frequency coronal oscillations and coronal heating

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...90..325p&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 90, Feb. 1984, p. 325-330. Research supported by the National Geographic Society and Willia

Physics

38

Magnetohydrodynamic Waves, Plasma Heating, Solar Corona, Solar Oscillations, High Frequencies, Power Spectra, Solar Eclipses, Solar Heating

Scientific paper

At the 1980 total solar eclipse, a search was made for high-frequency (0.1-2 Hz) oscillations in the intensity of the 5303-A coronal green line, as a test of predictions of theories of coronal heating via magnetohydrodynamic waves. Portions of the image 2.5- or 5-arcsec across were fed to cooled photomultipliers using fiber-optic probes. Excess power was detected in Fourier transforms of the data for the region between 0.5 and 2 Hz at the level of 1 percent or 2 percent of the incident power. Such oscillations could be associated with Alfven waves that are trapped on loops a few thousand kilometers long or with fast waves that are trapped on loops a few thousand kilometers in diameter. Additional observations at the 1983 eclipse are planned to resolve atmospheric and instrumental contributions.

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