10 most powerful solar flares of 2024

It’s been a busy year on the sun, as it officially entered the peak of its roughly 11-year cycle of activity, known as solar maximum. In 2024, the sun launched over 50 X-class solar flares — the most powerful type of solar flare — at Earth.

Solar flares are categorized by the level of X-rays they produce in a specific wavelength range (1 to 8 angstroms). Solar flare classes follow a logarithmic scale, with each flare class — C, M and X — 10 times stronger than the previous one. Solar flares can also unleash giant clouds of plasma known as coronal mass ejections (CMEs), which can cause geomagnetic storms and widespread auroras.

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