Abstract:
Quasi-periodic pulsations with periods mostly around 13 s in the frequency range of 54-78 MHz have been observed following the first X2 flare occurring on 24 November 2000. Assuming an impulsively generated propagating MHD wave in a coronal loop for the pulsations, the coronal magnetic field at 1.6 Rsolar is derived as ~6 G and the radius of cross section of the loop as ~13000 km.
