Na和Mg辐射与中心反向巴耳末线的太阳辐射
Solar prominences with Na and Mg emissions and centrally reversed Balmer line
摘要：
我们研究了异常明亮的太阳临边带中的谱线，这些谱线具有明显的钠和镁发射。我们发现，大多数具有显着的NaD 2和MgB 2发射的双折射显示中央反转的H-α，偶尔甚至H-β，这是很好地再现了半无限模型的配置文件。最大的H-α源函数对应于3950 K的激发温度，对于显著的中心反转4000 K;相关的光学厚度超过10.0。NaD 2和Mgb 2剖面的窄宽度产生5 km/s的非热加宽。
英文摘要：
We study spectral lines in exceptionally bright solar limb prominences with pronounced sodium and magnesium emission. We find that most prominences with significant NaD2 and Mgb2 emission show centrally reversed profiles of H-alpha and occasionally even of H-beta, which are are well reproduced by semi-infinite models. The maximum H-alpha source function corresponds to an excitation temperature of 3950 K, for pronounced central reversions 4000 K; the related optical thickness exceeds 10.0. The narrow widths of the NaD2 and Mgb2 profiles yield a non-thermal broadening of 5 km/s.
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