INSITU MEASUREMENTS OF SPECTRAL CHARACTERISTICS OF F-REGION INONSOPERIC IRREGULARITIES
INSITU MEASUREMENTS OF SPECTRAL CHARACTERISTICS OF F-REGION INONSOPERIC IRREGULARITIES
复制标题
DOI：
10.1029/ja079i010p01497
复制
发表时间：
1974-01-01
影响因子：
--
通讯作者：
HANSON, WB
中科院分区：
文献类型：
--
作者：
DYSON, PL;MCCLURE, JP;HANSON, WB
Ogo 6上的延迟电位分析仪提供了沿卫星路径的高分辨率离子浓度观测。离子浓度的变化可小至0.03%，有时可小至0.01%。空间分辨率在35 ~ 380 m之间。对数据样本进行了分析，以确定观察到的f区不规则的光谱特性。观察到的最常见的频谱非常近似地遵循a αf - nαSn的幂定律，其中a为不规则幅度，f为观察到的频率，s为不规则尺度大小。在70 m ~ 7 km尺度范围内进行了光谱测量，得到的值接近1，平均值为0.95。发现光谱指数对不规则幅度不敏感。这种谱表明，该尺度范围内的不规则性是由较大不规则性的湍流耗散引起的。在赤道，较大的不规则可能是由对流电场产生的。在高纬度地区，电场也可能参与其中，但其他因素，如沉淀粒子，也可能促成或主要负责产生巨大的不规则现象。还显示了与波浪形不规则性和“磨玻璃”（高频噪声）不规则性相关的其他类型光谱的例子。
The retarding potential analyzer aboard Ogo 6 has provided high‐resolution observations of the ion concentration along the satellite path. Changes in ion concentration as small as 0.03% and at times as small as 0.01% could be measured. Spatial resolution varied from 35 to 380 m. Samples of data have been analyzed to determine the spectral properties of theFregion irregularities observed. The most common frequency spectrum observed follows to a very good approximation a power law of the formAαf−nαSn, whereAis the irregularity amplitude,fis the observed frequency, andSis the irregularity scale size. The spectrum was measured over the scale size range 70 m to 7 km, and the values ofnobtained were close to 1, the average value being 0.95. The spectral indexnis found to be insensitive to irregularity amplitude. This type of spectrum suggests that the irregularities in this scale size range result from the turbulent dissipation of larger irregularities. At the equator the larger irregularities are probably produced by convective electric fields. At high latitudes, electric fields may also be involved, but other factors such as precipitating particles may contribute to, or be primarily responsible for, the production of large irregularities. Examples of other types of spectra associated with wavelike irregularities and with ‘ground glass’ (high‐frequency noise) irregularities are also shown.