On the Nature of Coronal EIT Waves

Details On the Nature of Coronal EIT Waves On the Nature of Coronal EIT Waves

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...633l.145b&link_type=abstract

The Astrophysical Journal, Volume 633, Issue 2, pp. L145-L148.

Astronomy and Astrophysics

Astronomy

42

Sun: Corona, Sun: Oscillations, Waves

Scientific paper

Large-scale eruption events in the solar atmosphere can generate global waves, i.e., waves that propagate over distances comparable to the solar radius. In the low solar corona, global waves observed by SOHO EIT, generated by coronal mass ejections or flares, are usually referred to as ``EIT waves.'' The nature of these global waves is the subject of strong debate, and opinions are divided between different interpretations (e.g., fast magnetohydrodynamic waves, shock waves, nonwave feature, etc.). In the present Letter, we studied TRACE EUV data to show that these global coronal disturbances are indeed waves with a well-defined period. Supposing that the EIT waves transfer all their energy to interacting loops, we also estimate the minimum energy threshold carried by EIT waves.

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