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云南天文臺發現太陽耀斑爆發會引發光球層黑子結構轉變

文章來源:云南天文臺   發布時間:2019-04-04  【字號:     】  

  近期,中國科學院云南天文臺撫仙湖太陽觀測與研究基地徐喆和合作者,報道了M5.0級太陽耀斑爆發導致光球層黑子半影結構收縮衰退,并轉變成為黑子本影結構的現象。該研究成果發表在國際天文學雜志《天體物理學雜志》(The Astrophysical Journal)上。

  太陽黑子的形成,是由于太陽內部磁場向光球表面浮現所造成的。因此太陽黑子演化的驅動力往往來自于太陽內部。最近提出的“磁內爆”理論推測,太陽高層大氣的耀斑爆發同樣會影響太陽表面的磁場結構。然而,目前對于支持“磁內爆”的觀測證據尚存在爭議。

  徐喆等人利用云南天文臺一米新真空太陽望遠鏡(NVST)的高分辨率觀測數據發現,處于耀斑爆發中心下方的太陽黑子,在耀斑期間出現了黑子半影向本影的轉變(如附圖所示)。這一過程與內部磁流驅動的黑子演化完全相反,后者往往表現為黑子本影向半影結構的轉變。

  這一事件的研究工作解決了目前對于“磁內爆”觀測的兩大爭議。首先,黑子結構的轉變與之前觀測的磁場突變不同,可以排除對于耀斑期間磁場探測有效性的爭議。其次,黑子結構的逆趨勢演化,也可以排除結構轉變是受內部磁流驅動的爭議。

  該系列研究工作得到國家自然科學基金、中科院西部之光、云南省創新團組等的資助支持。

  文章鏈接 

 

  圖(a-c)展示了太陽高層大氣中正在爆發的太陽耀斑現象。圖(d1-d4)展示了太陽表面黑子半影纖維轉變成黑子本影的過程。




(責任編輯:葉瑞優)

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