The altitude variation of the ionospheric photoelectron flux: a comparison of theory and measurement
The altitude variation of the ionospheric photoelectron flux: a comparison of theory and measurement
复制标题
电离层光电子通量的高度变化：理论与测量的比较
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
D. Torr
中科院分区：
文献类型：
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作者：
P. Richards;D. Torr
在13至18 eV，28至34 eV，和50至55 eV的能量区域的测量的光电子通量的145至300公里的高度变化进行了比较，从理论上预期的变化。在这些能量下，测量的光电子通量和太阳EUV通量的衰减之间存在很强的线性关系。因此，光电子通量对太阳天顶角、中性密度标度高度和总中性密度的变化很敏感。然而，与先前的断言相反，在大多数能量下的光电子通量对中性组分的相对密度不敏感。此外，理论和测量之间的良好协议。通过使用光电子产生频率的概念，通常复杂的局部平衡光电子通量的评估减少到一个平凡的计算，使计算中的步骤可以很容易地验证。
The 145 to 300-km altitude variation of the measured photoelectron flux in the 13 to 18 eV, 28 to 34 eV, and 50 to 55 eV energy regions are compared with the variations expected from theory. There is a strong linear relationship between the measured photoelectron flux and the attenuation of the solar EUV flux at these energies. Therefore, the photoelectron flux is sensitive to changes in the solar zenith angle, neutral density scale height, and total neutral density. However, contrary to previous assertions, the photoelectron flux at most energies is not sensitive to the relative densities of the neutral constituents. In addition, good agreement between theory and measurement is obtained. By using the concept of photoelectron production frequencies, the usually complex evaluation of the local equilibrium photoelectron flux is reduced to a trivial calculation so that the steps in the calculation can be readily verified.