Space Weather ALERT R2 EMMISSION EVENT 10/20/12

Issue Time: 2012 Oct 20 1849 UTC

ALERT 2: Type II Radio Emission
Begin Time: 2012 Oct 20 1815 UTC
Estimated Velocity: 516 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT 1: X-Ray Flux exceeded M5
Threshold Reached: 2012 Oct 20 1814 UTC
NOAA Scale: R2 – Moderate

NOAA Space Weather Scale descriptions can be found at

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity.


About the author

Recipient of many prestigious NASA Awards including the Exceptional Public Service Medal and the Robert H. Goddard award. Experience includes working for NASA, as a contractor, in satellite design, construction and operations. Expert in the satellite operations concepts and ground systems including command, control, and science data processing.