Lyman continuum observations of solar flares
Lyman continuum observations of solar flares
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太阳耀斑的莱曼连续谱观测
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
R. Noyes
中科院分区：
文献类型：
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作者：
M. Machado;R. Noyes
利用阿波罗望远镜上的哈佛大学天文台EUV光谱仪获得的数据，对太阳耀斑的莱曼连续体观测进行了研究。我们发现有两种主要类型的耀斑区域：与Hα耀斑区域一致的整体“平均”耀斑区域，以及可以与其他作者观测到的Hα和x射线核相识别的瞬态莱曼连续体核。研究发现，耀斑中的地面氢密度比太阳平静区和活跃区更接近于LTE，并且大气中莱曼连续体的形成水平从太阳平静区质量柱密度m≈5/sx 10−6 g cm−2降低到平均耀斑的m≈3/sx 10−4 g cm−2，在核中降低到m ~ 10−3g cm−2。从这些结果中，我们得出色球物质“蒸发”到高温区域的量，发现其为~ - 1015g，与x射线发射测量的观测结果一致。将核观测结果与文献中可用的模式加热计算的理论预测结果进行了比较；观测结果与当前的粒子加热模型之间存在显著差异。
A study is made of Lyman continuum observations of solar flares, using data obtained by the Harvard College Observatory EUV spectroheliometer on the Apollo Telescope Mount. We find that there are two main types of flare regions: an overall ‘mean’ flare coincident with the Hα flare region, and transient Lyman continuum kernels which can be identified with the Hα and X-ray kernels observed by other authors. It is found that the ground level hydrogen population in flares is closer to LTE than in the quiet Sun and active regions, and that the level of Lyman continuum formation is lowered in the atmosphere from a mass column density m ≈ 5/sx 10−6 g cm−2 in the quiet Sun to m ≈ 3/sx 10−4 g cm−2 in the mean flare, and to m ∼ 10−3g cm−2 in kernels. From these results we derive the amount of chromospheric material ‘evaporated’ into the high temperature region, which is found to be ∼- 1015g, in agreement with observations of X-ray emission measures. A comparison is made between kernel observations and the theoretical predictions made by model heating calculations, available in the literature; significant discrepancies are found between observation and current particle-heating models.