April 2, 2001       The SID of One of the Three Largest Solar Flares in Recorded History   

 

 

The flare began to appear on my charts at 2134 UT  as a Sudden Ionospheric Disturbance. Of particular note is the slight chart line dip preceding the initial shock front in the 50 MHz chart above.
On the 20.2 MHz chart below there is a steep dropout of the chart line indicating an X-ray flare in process. The charts say an X17 + Superflare but it was upgraded to X22.  

Thomas Ashcraft
New Mexico

Mail
ashcraft(at)heliotown.com