蝌蚪状下流:太阳日冕耀斑中等离子体加热的新机制

IF 0.5 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Scientia Sinica-Physica Mechanica & Astronomica Pub Date : 2021-11-01 DOI:10.1360/SSPMA-2021-0053
Leping Li
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引用次数: 0

摘要

太阳耀斑是一种由磁重联快速释放的磁能驱动的太阳活动现象。到目前为止,加热燃烧等离子体的机制仍在争论中。最近,美国乔治梅森大学、北京大学等的研究人员发现,在耀斑发生时,会产生一组暗色的蝌蚪状下流,与耀斑环的顶点发生碰撞,并将周围的等离子体强烈加热至10 - 20mk的较高温度。这一发现也为太阳和恒星耀斑中经常观测到的准周期脉动提供了一种新的替代解释。
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Tadpole-like downflows: A new mechanism for plasma heating in the flaring solar corona
Solar flares are a solar activity phenomenon powered by magnetic energy released rapidly through magnetic reconnection. So far the mechanisms for heating the flaring plasma are still under debate. Recently, the researchers from George Mason University, Peking University, etc. discovered that a group of dark tadpole-like downflows, produced during flares, collide with the apexes of flare loops, and strongly heat the surrounding plasma to a higher temperature of 10–20 MK. This discovery also provides a new and alternative explanation for the quasi-periodic pulsations that are often observed in solar and stellar flares.
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