http://www.swpc.noaa.gov
http://www.spaceweather.com
http://www.sgo.fi/Data/RealTime/magnetogram.php
http://www.ig.cas.cz/en/structure/observatories/geomagnetic-observatory-budkov/forecast-of-geomagnetic-activity/
http://www.voacap.com/
http://www.interalia.plus.com/SOLAR_HO.pdf