Observation of He II emission from the plasmasphere by a newly developed EUV telescope on board sounding rocket S‐520‐19
Observation of He II emission from the plasmasphere by a newly developed EUV telescope on board sounding rocket S‐520‐19
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利用探空火箭 S-520-19 上新开发的 EUV 望远镜观测等离子层的 He II 发射
DOI：
10.1029/97ja01530
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发表时间：
1997
影响因子：
--
通讯作者：
A. Yamaguchi
中科院分区：
文献类型：
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作者：
I. Yoshikawa;M. Nakamura;M. Hirahara;Y. Takizawa;K. Yamashita;H. Kunieda;T. Yamazaki;K. Misaki;A. Yamaguchi
氦发射监测器（HEM）是一种新开发的极紫外望远镜，调整为对He II发射线（304 A）敏感。它是作为即将到来的等离子层成像任务的原型而开发的。 HEM 设计紧凑、简单，采用多层镀膜镜、薄金属滤光片和镀有 CsI 的微通道板；它在 304 A (∼100 cps/R) 下表现出高灵敏度和高角分辨率 (2.5°)，最重要的是它不受其他主要发射线的污染，例如 He I (584 A)、O II (834 A) 和 H I (1216 A)。我们报告了 S-520-19 探空火箭上携带的 HEM 对等离子层 He II 发射的初步观察。我们将观测结果与使用扩散平衡模型、MSIS-86 模型和赤道电子密度模型的理论预测进行了比较。该模型表明与使用 3700 cm−3 顶面电离层 He+ 数密度值和 8000 K 等离子层顶黎明面附近的赤道温度值进行的观测结果非常吻合。
The helium emission monitor (HEM) is a newly developed extreme ultraviolet telescope adjusted to be sensitive to the He II emission line (304 A). It is developed as a prototype for upcoming plasmaspheric imagery missions. The HEM is designed to be compact and simple using a multilayer coated mirror, a thin metal filter, and a microchannnel plate coated with CsI; it exhibits high sensitivity at 304 A (∼100 cps/R) and high angular resolution (2.5°), and most importantly it is contamination free from other major emission lines, e.g., He I (584 A), O II (834 A), and H I (1216 A). We report on the initial observation of He II emission from the plasmasphere by the HEM carried on board sounding rocket S-520-19. We compare the observation with the theoretical prediction using a diffusive equilibrium model, the MSIS-86 model, and an equatorial electron density model. The model indicates a good agreement with the observations using values for the He+ number density at the topside ionosphere of 3700 cm−3 and for the equatorial temperature near the dawnside of the plasmapause of 8000 K.