Small-scale eruptive filaments on the quiet sun
Small-scale eruptive filaments on the quiet sun
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发表时间：
1986-09
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通讯作者：
L. Hermans;S. Martin
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作者：
L. Hermans;S. Martin
对安静太阳上一类鲜为人知的喷发事件进行了研究。在对大熊太阳天文台拍摄的安静太阳的 32 天 H α 延时胶片进行系统调查时，发现了所有 61 个小规模喷发丝状结构。完全发育后，这些结构在喷发前平均长度为 15 角秒。它们似乎是在圆盘上观察到的大规模喷发丝的小规模类似物。按照平均每天 7 小时每个视野观察到 1.9 个小规模喷发特征的情况，估计这些事件在太阳上的发生率每 24 小时每天超过 600 次。喷发阶段的平均持续时间为 26 分钟，而从形成到喷发的平均寿命为 70 分钟。大多数小规模丝状结构在空间上与消除视线光球磁力图中的磁性特征有关。与大规模丝状结构类似，小规模丝状结构有时会分开相反极性的抵消片段，但通常具有一端或两端终止于抵消位点的结构。它们的高数量似乎反映了安静的太阳上更大的通量。根据它们的特征、演化以及与光球磁通量的关系，可以得出结论，所描述的结构是小规模喷发丝状体，并且是所有丝状体的子集。
A study of a little known class of eruptive events on the quiet sun was conducted. All of 61 small-scale eruptive filamentary structures were identified in a systematic survey of 32 days of H alpha time-lapse films of the quiet sun acquired at Big Bear Solar Observatory. When fully developed, these structures have an average length of 15 arc seconds before eruption. They appear to be the small-scale analog of large-scale eruptive filaments observed against the disk. At the observed rate of 1.9 small-scale eruptive features per field of view per average 7.0 hour day, the rate of occurence of these events on the sun were estimated to be greater than 600 per 24 hour day.. The average duration of the eruptive phase was 26 minutes while the average lifetime from formation through eruption was 70 minutes. A majority of the small-scale filamentary sturctures were spatially related to cancelling magnetic features in line-of-sight photospheric magnetograms. Similar to large-scale filaments, the small-scale filamentary structures sometimes divided opposite polarity cancelling fragments but often had one or both ends terminating at a cancellation site. Their high numbers appear to reflect the much greater flux on the quiet sun. From their characteristics, evolution, and relationship to photospheric magnetic flux, it was concluded that the structures described are small-scale eruptive filaments and are a subset of all filaments.