Institut national de recherche scientifique français Univerité Pierre et Marie Curie Université Paris Diderot - Paris 7

Getting the most out of the SOHO and STEREO images

mercredi 10 septembre 2008, par Guillermo Stenborg (NASA GSFC and Interferometrics, Inc.)

Mardi 15 avril 2008 à 11h00 , Lieu : (Salle de conférence du bât. 17)

The Extreme-ultraviolet Imagers on board both the Solar and Heliospheric Observatory (SOHO) and the STEREO Spacecraft, EIT and STEREO EUVI respectively, have been providing (and continue to provide) the solar physics community with an unprecedented view of the extreme-ultraviolet (EUV) solar transition region and corona. In particular, they have observed EUV bright points, coronal holes, loops, and arcades, as well as dynamical events such as flares, EIT waves, and mass ejections. However, the multi-scale nature of the observed solar features has not been fully exploited so far. In particular, a new wavelet-based technique was recently introduced to clean and enhance the SOHO EIT images (Stenborg et al., ApJ, 674, 1201-1206, 2008). The technique has been now successfully adapted to work on the most recent STEREO EUVI images as well. In this talk, after a brief description of the instruments and their science objectives I will show a few examples of features and phenomena not revealed with standard image-processing techniques to assert the effectiveness of the algorithms implemented.