seismology and solar flare prediction

www.spaceweather.com contains images of the opposite facing side of the Sun
computed by seismic techniques. This is the basis for anticipating solar
storm disruptions around US Thanksgiving time.  The monster sunspots still
appear to be on the Sun, which takes 27 days to rotate, and will reappear
on our side the end of November. There aren't photo satellites regularly
observing the far side of the Sun. So seismic vibrations on the earth-facing
side of the Sun are tomographically inverted to image the velocity anomalies
far side of the Sun which represent cooler sunspot regions. Seismic vibrations
are measured at tens of thousands of locations on the Sun's surface via
Doppler shifts by the Soho satellite.