Definition of physical parameters of 8 X-class solar flares

We observed top 8 X-class solar flares registered in the period May 1998 – 2015. measure physical parameters of flares, such as temporal scale, size, and magnetic flux density, find that sizes tend to be distributed more broadly GOES class becomes weaker there is a lower limit density depends on class. also made brief analysis these days, has shown duration time peak Universal time.             have identified several quantities estimated reconnection rate flares. To determine we used images taken with AIA instrument board SDO satellite at wavelengths 131 Å, 174 193 211 335 1600 1700 4500 SXT - pictures, HMI Magnetogram, SOLIS Chromospheric XRT-data. Using values, calculate inflow velocity, coronal Alfven rate. The velocities vary from few kilometers per second tens second, corona are range 103 104 second. As result, 10-3. flare tends decrease increases.