Physics & Astronomy

Sun’s Mid-Level Flare: What It Means for Earth

SDO captured this image of the mid-level flare, an M6.6-class, on June 22, 2015.
Credit: NASA/SDO

Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however — when intense enough — they can disturb the atmosphere in the layer where GPS and communications signals travel.

To see how this event may affect Earth, please visit NOAA's Space Weather Prediction Center at http://spaceweather.gov, the U.S. government's official source for space weather forecasts, alerts, watches and warnings.

This flare is classified as a M6.6 flare. M-class flares are a tenth the size of the most intense flares, the X-class flares.

The number provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc.

Media Contact

Karen Fox
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