Slow Magnetoacoustic Waves in Coronal Loops?

Details Slow Magnetoacoustic Waves in Coronal Loops? Slow Magnetoacoustic Waves in Coronal Loops?

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..575r&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Computer Science

Sound

7

Scientific paper

On May 13, 1998 the EIT and TRACE instruments produced simultaneous high cadence image sequences of the same active region (AR 8218). TRACE achieved a 25 sec cadence in the 171 deg passband while EIT achieved a 15 sec cadence (operating in 'shutterless mode', SOHO JOP 80) in the 195 deg passband. These high cadence observations in two complementary wavelengths have revealed the existence of weak disturbances in an extended coronal loop system. The disturbances originate from small scale brightenings at the footpoints of the loops and propagate along the loops at an apparant speed of the order of 150 km/s which is close to the expected sound speed. To conclude whether these propagating disturbances should be interpreted as slow magnetoacoustic waves or as mass motions ('microflows'), we compare our observational findings with theoretical models. Our results suggest that the recent discovery of DeForest and Gurman (1998) of slow MHD waves in polar plumes, are in fact not typical of polar plumes but occur also in extended coronal structures elsewhere.

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