Flare

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Flare </dt>
1. A bright eruption form the sun's chromosphere. Compare prominence. </dd>
''Flares may appear within minutes and fade within an hour. They cover a wide range of intensity and size, and they tend to occur between sunspots or over their penumbrae. '</dd>
'Flares are related to radio fadeouts and terrestrial magnetic disturbances. '</dd>
'Flares eject high energy protons which present a serious hazard to men in unshielded spacecraft. </dd>
2. Pyrotechnic devices used for signaling or to provide illumination. </dd>
3. An expansion at the end of a cylindrical body as at the base of a rocket. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use