NASAのインスタグラム(nasagoddard) - 9月7日 02時40分

This morning, the Sun released the most powerful solar flare recorded since at least 2008. Our nearest star has been lively all week, emitting three flares – two of which were "X-class," the most intense kind. NASA’s Solar Dynamics Observatory, which watches the Sun constantly, captured this image of the largest flare.

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.

The most recent flare was the largest so far in the current solar cycle, the approximately 11-year-cycle during which the Sun’s activity waxes and wanes. The current solar cycle began in December 2008, and is now decreasing in intensity and heading toward solar minimum. This is a phase when such eruptions on the Sun are increasingly rare, but history has shown that they can nonetheless be intense.
Credit: NASA/GSFC/SDO
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