X-CLASS SOLAR FLARE: New sunspot AR3663 erupted this morning, May 3rd @ 0222 UT, producing an X1.6-class solar flare. NASA's Solar Dynamics Observatory captured the extreme ultraviolet flash:
Radiation from the flare ionized the top of Earth's atmosphere and caused a deep shortwave radio blackout over Australia, Japan, and much of China: map. Ham radio operators may have noticed loss of signal below 30 MHz for a half an hour after the flare's peak.
Shortly after the flare, the US Air Force reported a Type II solar radio burst, a type of natural radio signal emitted by shocked gas at the leading edge of a CME. This means a CME might be emerging from the blast site. Confirmation awaits fresh data from the Solar and Heliospheric Observatory (SOHO). Stay tuned
EARTH-DIRECTED CME--CONFIRMED: Today's X-class solar flare (described below) did indeed produce a CME, and it has an Earth-directed component. A NASA model suggests the southern flank of the CME will arrive on May 5th around 1800 UT. The impact could cause G1 to G2-class geomagnetic storms on May 5th and 6th