Young stars are usually excluded from planet searches because they have intense magnetic fields that generate a range of phenomena known collectively as stellar activity, including flares and spots.

搜寻行星时通常把年轻的恒星排除在外，因为它们有强烈的磁场，会产生包括耀斑在内的恒星磁活动，这使得天文学家很难分辨行星和活动信号。

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The relation between stellar chromospheric activity and rotation of evolution stars have a good relativity.

演化恒星的色球活动与恒星自转周期间存在很好的相关性。

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The rising red dwarf star shows expected stellar magnetic activity which includes dramatic and violent prominences .

上升中的红矮星有著可预期的磁场活动，包含了激烈的日珥现象。

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Astrophysicists must continually observe as many nearby solar analogues as possible, using spectroscopy to measure stellar magnetic activity.

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Magnetic activity on the stellar surface could also be caused by accretion of material onto it.

MSN: Newborn star's 'heartbeat' seen by X-ray telescopes

"We think that magnetic activity on or around the stellar surface creates the super-hot plasma, " Hamaguchi said.

MSN: Newborn star's 'heartbeat' seen by X-ray telescopes