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arXiv 1401.8036astro-ph.SR
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日震和星震

Sunquakes and starquakes

Alexander G. Kosovichev

摘要:

除了由湍流对流和不稳定性激发太阳和恒星振荡的众所周知的机制之外,振荡可以由太阳和恒星耀斑中的能量释放引起的脉冲局部力激发。在太阳上观测到了这种振荡(“日震”),并就脉冲激发的物理机制及其与耀斑物理学的关系进行了许多有趣的讨论。观测和理论表明,大部分的太阳地震能量是以高度、高频的p波模式释放的。此外,也有关于强烈太阳耀斑激发的低度模式的日震观测报告。在其他恒星上观测到的更强大的耀斑可能会引起振幅高得多的“星震”。对这种振荡的观测可以提供新的星震信息,也可以对恒星耀斑的机制加以限制。本文讨论了日震的基本性质和开普勒短步调数据中探测耀斑激发振荡的初步尝试。

英文摘要:

In addition to well-known mechanisms of excitation of solar and stellar oscillations by turbulent convection and instabilities, the oscillations can be excited by an impulsive localized force caused by the energy release in solar and stellar flares. Such oscillations have been observed on the Sun (`sunquakes'), and created a lot of interesting discussions about physical mechanisms of the impulsive excitation and their relationship to the flare physics. The observation and theory have shown that most of a sunquake's energy is released in high-degree, high-frequency p modes. In addition, there have been reports on helioseismic observations of low-degree modes excited by strong solar flares. Much more powerful flares observed on other stars can cause `starquakes' of substantially higher amplitude. Observations of such oscillations can provide new asteroseismic information and also constraints on mechanisms of stellar flares. The basic properties of sunquakes and initial attempts to detect flare-excited oscillations in Kepler short-cadence data are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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