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A sunspot on the sun's eastern limb is crackling with powerful X-class solar flares. It announced itself with an X1.7-class eruption on May 13th at 0217 UT, quickly followed by an X2.8-class flare at 1609 UT. These are the strongest flares of 2013, and they signal a significant uptick in solar activity. More eruptions are in the offing.
ALERT: Type II Radio Emission
Begin Time: 2013 May 13 1557 UTC
Estimated Velocity: 949 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: Type IV Radio Emission
Begin Time: 2013 May 13 1557 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
SUMMARY: 10cm Radio Burst
Begin Time: 2013 May 13 1553 UTC
Maximum Time: 2013 May 13 1601 UTC
End Time: 2013 May 13 1618 UTC
Duration: 25 minutes
Peak Flux: 520 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
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