The GOES x-ray plots shown here are used to track solar activity and
solar flares. Large solar x-ray flares can change the Earth’s
ionosphere, which blocks high-frequency (HF) radio transmissions on the
sunlit side of the Earth. Solar flares are also associated with Coronal
Mass Ejections (CMEs) which can ultimately lead to geomagnetic storms.
SWPC sends out space weather alerts at the M5 (5x10-5 Watts/mw) level.
Some large flares are accompanied by strong radio bursts that may
interfere with other radio frequencies and cause problems for satellite
communication and radio navigation (GPS).
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