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NASA - X-Class: A Guide to Solar Flares

All times listed are in UTC. Below you'll find an overview of the solar flares that occurred on the Sun today, arranged in order of time of occurrence. If there weren't any noteworthy events on the Sun, nothing will be displayed. For more data about the past days, months or years please look in our archive. A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs.

Secrets of solar flares are unlocked - BBC News

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Help FAQ Acronyms and abbreviations. Help What are solar flares?

Compared to X- and M-class events, C-class flares are small with few noticeable consequences here on Earth. Solar flares are different to 'coronal mass ejections' CMEs , which were once thought to be initiated by solar flares. CMEs are huge bubbles of gas threaded with magnetic field lines that are ejected from the Sun over the course of several hours.

Solar storm expected to reach Earth today – here’s what you need to know

Although some are accompanied by flares, it is now known that most CMEs are not associated with flares. This has important implications for understanding and predicting the effects of solar activity on the Earth and in space.

If a CME collides with the Earth, it can excite a geomagnetic storm. Large geomagnetic storms have, among other things, caused electrical power outages and damaged communications satellites. The energetic particles driven along by CMEs can be damaging to both electronic equipment and astronauts or passengers in high-flying aircraft.

Solar storm expected to reach Earth today – here’s what you need to know

Solar flares, on the other hand, directly affect the ionosphere and radio communications at the Earth, and also release energetic particles into space. Therefore, to understand and predict 'space weather' and the effect of solar activity on the Earth, an understanding of both CMEs and flares is required.

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