A Simple Topological Model of the Bastille Day Flare (2000, July 14)

摘要

We present results of three-dimensional numerical modelling of the coronal magnetic field in the active region NOAA 9077, where a large two-ribbon flare (3B/X57) occurred on 2000, July 14. The coronal field was reconstructed using a potential approach on the base of photospheric magnetograms obtained by the SOHO/MDI. An analysis of the computed structure is performed. Two-ribbon nature of the flare observed in different wavelengths by spacecrafts Yohkoh and TRACE, is shown to be a consequence of the field topology. A place and a form of bright chromospheric ribbons and the apparition of bright kernels along the edges of ribbons are explained. Note that the advantage of our model consists in the simplicity and the clearness.