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首页> 外文期刊>Astronomy and astrophysics >Observations of Ellerman bomb emission features in He?i?D3 and He i 10?830 ?
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Observations of Ellerman bomb emission features in He?i?D3 and He i 10?830 ?

机译：Heler？3和He？10？830？中Ellerman炸弹发射特征的观测。

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Context. Ellerman bombs (EBs) are short-lived emission features, characterised by extended wing emission in hydrogen Balmer lines. Until now, no distinct signature of EBs has been found in the He? i ?10?830 ? line, and conclusive observations of EBs in He? i ?D _(3) have never been reported. Aims. We aim to study the signature of EBs in neutral helium triplet lines. Methods. The observations consisted of ten consecutive SST/TRIPPEL raster scans close to the limb, featuring the H β , He? i ?D _(3) and He? i ?10?830 ? spectral regions. We also obtained raster scans with IRIS and made use of the SDO/AIA 1700 ? channel. We used H azel to invert the neutral helium triplet lines. Results. Three EBs in our data show distinct emission signatures in neutral helium triplet lines, most prominently visible in the He? i ?D _(3) line. The helium lines have two components: a broad and blueshifted emission component associated with the EB, and a narrower absorption component formed in the overlying chromosphere. One of the EBs in our data shows evidence of strong velocity gradients in its emission component. The emission component of the other two EBs could be fitted using a constant slab. Our analysis hints towards thermal Doppler motions having a large contribution to the broadening for helium and IRIS lines. We conclude that the EBs must have high temperatures to exhibit emission signals in neutral helium triplet lines. An order of magnitude estimate places our observed EBs in the range of T ~ 2 × 10~(4)?10~(5) K.
机译：上下文。 Ellerman炸弹（EBs）具有短暂的发射特征，其特征是氢鲍默线中的机翼发射延长。到目前为止，在He？中还没有发现EB的独特签名。我10 830线和关于EB的结论性结论？ i？D _（3）从未被报道过。目的我们旨在研究中性氦三重态系中EB的特征。方法。观察结果包括在肢体附近连续进行的十次SST / TRIPPEL栅格扫描，特征在于Hβ，He？我？D _（3）和他吗？我10 830光谱区域。我们还使用IRIS获得了光栅扫描，并使用了SDO / AIA 1700？渠道。我们使用H azel反转中性氦三重态线。结果。我们数据中的三个EB在中性氦三重态谱线中显示出不同的发射特征，在He？中最明显。我？D _（3）行。氦气线有两个分量：与EB相关的宽和蓝移发射分量，以及在上层色球中形成的较窄吸收分量。我们数据中的EB之一表明了其发射分量中存在很强的速度梯度。其他两个EB的发射组件可以使用恒定平板安装。我们的分析表明，热多普勒运动对氦和IRIS谱线的拓宽有很大贡献。我们得出结论，电子束必须具有高温才能在中性氦三重态谱线中显示发射信号。一个数量级的估计将我们观察到的EB置于T〜2×10〜（4）？10〜（5）K的范围内。

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