The concentration of calcium ions and of free electrons in a meteor coma
The concentration of calcium ions and of free electrons in a meteor coma
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流星彗发中钙离子和自由电子的浓度
DOI：
10.1051/0004-6361:20035623
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发表时间：
2004
影响因子：
6.5
通讯作者：
G. Kokhirova
中科院分区：
文献类型：
--
作者：
P. Babadzhanov;G. Kokhirova
研究了八颗明亮流星的棱镜光谱，它们属于不同的流星雨，并由塔吉克斯坦科学院天体物理研究所Gissar天文台的小型相机拍摄。单色光曲线的H和K谱线的电离钙双峰的构建和从它们的强度比在选定的点沿着流星轨迹的列NCaII和体积nCaII浓度的钙离子的测定。得到的数值NCa II = 10 16 −10 18 cm −2和nCa II = 10 13 −10 15 cm −3与用其他方法得到的钙丰度的估计值非常一致，证实了彗星中钙原子几乎完全电离。定义了自由电子的体积浓度ne = 4 × 10 13 cm −3，并计算了沿着流星路径的激发温度。
Prism spectra are studied of eight bright meteors, belonging to different showers and photographed by small cameras in the Gissar observatory of the Institute of Astrophysics, Tajik Academy of Sciences. Monochromatic light curves for the H and K spectral lines of the ionized calcium doublet are constructed and from the ratio of their intensities at selected points along the meteor trajectories the column NCaII and the volume nCaII concentrations of calcium ions are determined. The obtained values NCaII = 10 16 −10 18 cm −2 and nCaII = 10 13 −10 15 cm −3 are in good agreement with the estimates of calcium abundance obtained by other methods and confirm that there is almost full ionization of calcium atoms in meteor comae. The volume concentration of free electrons ne = 4 × 10 13 cm −3 is defined, and the excitation temperature is calculated along the meteor paths.