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Sun - Flares, Solar Activity, Coronal Mass Ejections

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Sun - Flares, Solar Activity, Coronal Mass Ejections: The most spectacular phenomenon related to sunspot activity is the solar flare, which is an abrupt release of magnetic energy from the sunspot region. Despite the great energy involved, most flares are almost invisible in ordinary light because the energy release takes place in the transparent atmosphere, and only the photosphere, which relatively little energy reaches, can be seen in visible light. Flares are best seen in the Hα line, where the brightness may be 10 times that of the surrounding chromosphere, or 3 times that of the surrounding continuum. In Hα a big flare will cover a few thousandths
Sun, star around which Earth and the other components of the solar system revolve. It is the dominant body of the system, constituting more than 99 percent of its entire mass. The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life.