Slow-mode oscillations of large-scale coronal loops |
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Authors: | Zdeněk ?vestka |
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Institution: | (1) Center of Astrophysics and Space Sciences, University of California at San Diego, La Jolla, California, USA;(2) SRON Utrecht, The Netherlands |
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Abstract: | 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 coronat loops of length (2 – 3) × 105 km. Therefore, the primary source of these long-periodic pulsations might be slow-mode oscillations in these large-scale loops. Free MHD oscillations, proposed earlier by Roberts, Edwin, and Benz (1984), may fit the observed data. |
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