Sun emits a medium-intensity solar flare

Jul 31, 2012 By Karen C. Fox

(Phys.org) -- The sun emitted a mid-level flare, peaking at 4:55 PM EDT on July 28, 2012.

are powerful bursts of radiation. from a flare cannot pass through Earth's atmosphere to affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. This disrupts the radio signals for as long as the flare is ongoing, anywhere from minutes to hours.

This flare is classified as an M6.2 flare. M- are the weakest flares that can still cause some space weather effects near Earth. They can cause brief radio blackouts at the poles.

Increased numbers of flares are quite common at the moment, since the sun's normal 11-year activity cycle is ramping up toward solar maximum, which is expected in 2013.

Updates will be provided as needed.

What is a solar flare? What is a ?

For answers to these and other space weather questions, please visit the Spaceweather Frequently Asked Questions page.

Explore further: NASA's Orion spacecraft back in Florida after test flight

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