Positive ion composition of the high‐latitude summer D region with noctilucent clouds
Positive ion composition of the high‐latitude summer D region with noctilucent clouds
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高纬度夏季D区夜光云的正离子组成
DOI：
10.1029/jd090id07p13041
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发表时间：
1985
影响因子：
--
通讯作者：
L. Björn
中科院分区：
文献类型：
--
作者：
E. Kopp;P. Eberhardt;U. Herrmann;L. Björn
7月30日（S26/1）和8月13日（S26/2）在基律纳上空测量了正离子组成、电子和总正离子密度，这是多国火箭运动的一部分，目的是研究日冕云（NLC）。两个磁离子质谱仪在黄昏时在65-126公里高度进行了测量，当时磁场活动非常低，NLC在82.5-83.4公里处出现。最丰富的质子水合物的水合顺序增加，从n = 3低于76公里，n = 6和n = 5，在88和87公里，分别为高度。从离子组成推断的温度显示，在90.5公里处的最低温度为104° K + 20°K。在这个高度上，测量到了一个特殊的离子谱，其中重质子水合物高达H+（H2O）12，这似乎表明了在狭窄层中通过离子成核形成冰粒的可能性。成分测量也被用来推断中间层的一氧化氮，水蒸气和过氧化氢的浓度。发现NLC区域中的水蒸气混合比按体积计约为百万分之3。
Positive ion composition and electron and total positive ion densities were measured on July 30 (S26/1) and August 13 (S26/2), above Kiruna as part of a multinational rocket campaign to study noctilucent clouds (NLC). Two magnetic ion mass spectrometers took measurements at altitudes of 65–126 km in twilight at times of very low magnetic activity and of NLC sightings at 82.5–83.4 km. The hydration order of the most abundant proton hydrates increased with height from n = 3 below 76 km to n = 6 and n = 5 at 88 and 87 km, respectively. Temperatures inferred from ion composition revealed a minimum of 104° + 20°K at 90.5 km. At this altitude a special ion spectrum with heavy proton hydrates up to H+(H2O)12 was measured, which seems to indicate the possibility for ice particle formation through ion nucleation in a narrow layer. The composition measurements were also used to infer mesospheric concentrations of nitric oxide, water vapor, and hydrogen peroxide. The water vapor mixing ratio in the NLC region was found to be around 3 parts per million by volume.