Aviolent flare-up of a star for a short time is called a
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Solar flare

Explanation:

A solar flare is an outburst of solar radiation from the surface of the sun outward. This leads to increase in heat intensity and brightness around sun.

The flare is often accompanied by the ejection of electromagnetic radiations from the surface of the star into the stellar space. It can last from a few minutes to some hours.

answerhydrogenous sediment;