B2X homepage

B2X-flare
An automatic flare detection for compiling an EUV flare catalog
Judith de Patoul, Véronique Delouille & Jean-François Hochedez

Solar Flares

Solar flares are large and sudden increases of the photon flux and represent the most powerful example of solar activity. The Extreme ultraviolet Imaging Telescope (EIT) on board of the Solar and Heliospheric Observatory (SoHO mission) provides a high resolution and very complete sampling of the solar corona in time, space and brightness, thereby allowing large statistical studies of EUV flares. Such studies will improve significantly our understanding of EUV flare phenomena with respect to better studied X-Ray flaring processes.

Here we propose a method to detect automatically EUV flares, belonging to class B to X, on EUV images of the whole solar disc.

Algorithm

We detect flares on each individual images by using a wavelet approach. The Continuous Wavelet Transfrom will detect discontinuities in the images, and some post-processing allows to determine which are flares. We apply a correction for the enhanced brightness present at the limb, which allows to detect flares also at the limb.

Publications and presentations using B2X.

B2X-flare catalog:

We build a new flare catalog called 'B2X-flare': It contains characteristics of flares such as

starting and end time
localisation on the disc
size on the disc
indication of intensity

Here are some example of output from the catalog.

Last Modified: 2006, November 12st - Judith de Patoul	Royal Observatory of Belgium Av. Circulaire, 3 - Ringlaan 3 1180 Bruxelles - Brussel BELGIUM