Large-scale Coronal Waves Observed with EUVI/STEREO

Details Large-scale Coronal Waves Observed with EUVI/STEREO Large-scale Coronal Waves Observed with EUVI/STEREO

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.97v&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

We report first observations and analysis of flare/CME associated large-scale coronal waves (so-called "EIT waves") observed with high time cadence by the EUVI instruments onboard the recent STEREO mission. The EIT instrument onboard SOHO for the first time directly imaged global disturbances in the solar corona, but the observations are severely hampered by the low cadence of EIT (12-15 min). Thus, the nature and origin of these large-scale disturbances are still not sufficiently constraint by observations, and it is an intense matter of debate whether EIT waves: a) are the coronal counterparts of Moreton waves observed in the chromosphere; b) are caused by the flare explosive energy release or by the erupting CME; c) are waves at all or rather propagating disturbances related to magnetic field line opening and restructuring associated with the CME lift-off. The high cadence full-disk coronal imaging by the EUVI instruments on the twin STEREO spacecraft provide us with the unprecedented opportunity to study the dynamics and origin of flare/CME associated coronal waves. We present first studies of global coronal waves observed with EUVI finding wave deceleration, indicative of an MHD blast wave (Veronig et al. 2008, ApJ Lett., in press).

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