Slow-mode oscillations of large-scale coronal loops

Details Slow-mode oscillations of large-scale coronal loops Slow-mode oscillations of large-scale coronal loops

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..152..505s&link_type=abstract

Solar Physics, vol. 152, no. 2, p. 505-508

Astronomy and Astrophysics

Astronomy

15

Coronal Loops, H Alpha Line, Magnetohydrodynamic Flow, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Power Spectra, Solar Flares, Solar Magnetic Field, Solar Oscillations, Solar Radio Emission, Solar X-Rays, X Ray Astronomy, X Ray Spectra, Goes 2, Mass Flow, Mathematical Models, Solar Maximum Mission, Solar Temperature, X Ray Imagery

Scientific paper

On several occasions, repetitive X-ray brightenings, sometimes accompanied by mass injections into adjacent loops, appeared quasi-periodically with mean periods close to 20 minutes. In all cases when X-ray images were available, the sites of these brightenings were in active regions which were associated with large-scale coronal loops of length (2 - 3) x 105 km. Therefore, the primary source of these long-periodic pulsations might be slow-mode oscillations in these large-scale loops. Free magnetohydrodynamic (MHD) oscillations, proposed earlier by Roberts, Edwin, and Benz (1984), may fit the observed data.

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