Guided Z mode propagation observed in the OEDIPUS A Tethered Rocket Experiment
Guided Z mode propagation observed in the OEDIPUS A Tethered Rocket Experiment
复制标题
俄狄浦斯 A 系留火箭实验中观察到的引导 Z 模式传播
DOI：
--
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
H. G. James
中科院分区：
文献类型：
--
作者：
H. G. James
系留探空火箭有效载荷OEDIPUS A对极光电离层中的等离子体波进行了双站传播实验。通过系绳上端的2 W发射器高频激励器（HEX）和下端的激励器（雷克斯）的相关接收器，在0-5 MHz频率范围内同步扫描，产生了准静电波的特征，这些准静电波沿着沿着场对齐的环境密度耗尽被引导。当f{sub p}大于回旋频率时，在等离子体频率f{sub p}和上混合共振频率f{sub uhr}之间，传播处于慢Z模式。模式识别基于f{sub p}的有效载荷测量。这些波具有约1 ms的信号延迟。延迟远大于在发射机-接收机间隔距离上的自由空间传播的预期，该间隔距离在飞行期间变化高达960 m。发射脉冲通常出现在等离子体频率上方约100 kHz的频率带宽内，但偶尔会占据f{sub p}和f{sub uhr}之间的大部分可用带宽（约等于}300 kHz）。观察到的延迟和拉伸的3倍的传输的300-{mu}s的脉冲占与二维射线跟踪使用热等离子体色散关系的completemore »电磁解决方案。延迟Z模式脉冲出现在约20%的电离图中。鉴于HEX发射机的弱点和飞行期间获得的大量实例，在极光电离层中引导自然Z模式发射可能是有效和广泛的。«少
The tethered sounding rocket payload OEDIPUS A conducted bistatic propagation experiments on plasma waves in the auroral ionosphere. Synchronized sweeps of the frequency range 0-5 MHz by the 2-W transmitter high-frequency exciter (HEX) on the upper end of the tether and its associated receiver for exciter (REX) on the lower end have produced signatures of quasi-electrostatic waves guided along field-aligned depletions of ambient density. The propagation is in the slow Z mode, between the plasma frequency f{sub p} and the upper hybrid resonance frequency f{sub uhr} when f{sub p} is greater than the cyclotron frequency. The mode identification is based on payload measurements of f{sub p}. These waves have signal delays of about 1 ms. The delays are much greater than expected for free-space propagation over the transmitter-receiver separation distance which varies up to 960 m during the flight. The transmitted pulses typically appear inside a frequency bandwidth of about 100 kHz just above the plasma frequency, but occasionally occupy most of the available bandwidth, {approx equal}300 kHz, between f{sub p} and f{sub uhr}. The observed delays and the stretching by a factor of 3 of the transmitted 300-{mu}s pulses are accounted for with two-dimensional ray tracing using a completemore » electromagnetic solution of the hot plasma dispersion relation. Delayed Z mode pulses appear in about 20% of the ionograms. Given the weakness of the HEX transmitter and the abundance of examples obtained during the flight, guiding of natural Z mode emissions in the auroral ionosphere may be efficient and widespread.« less