VLF signatures of ionospheric heating by HIPAS
VLF signatures of ionospheric heating by HIPAS
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HIPAS 电离层加热的 VLF 特征
DOI：
10.1029/95rs02191
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发表时间：
1995
期刊：
影响因子：
1.6
通讯作者：
S. Cummer
中科院分区：
文献类型：
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作者：
T. Bell;U. Inan;M. Danielson;S. Cummer
电离层下传播的甚低频信号的幅度和相位被认为是D区高度电子密度和温度的敏感指标。在这篇文章中，我们介绍了在阿拉斯加一个站的新观测，该站旨在提供对在阿拉斯加费尔班克斯附近的高功率极光刺激(HIPAS)高频加热设施加热的电离层区域下方传播的甚低频信号的测量。对1992年秋季和1993年春季进行的HIPAS运动的数据分析表明，在所分析的大约60%的案例中，在阿拉斯加州育空堡观察到的来自夏威夷NPM发射机的23.4 khz信号的幅度有可测量的变化，具有与HIPAS以2.85兆赫的高频发射相同的开/关调制模式。在分析的几乎70%的案例中，相同的信号显示出类似的可测量的相位变化。幅值变化范围为−0.2dB~+0.5dB，测量灵敏度约为±0.02dB。相位变化范围为−4.5°~−0.3°，测量灵敏度为±0.4°。结果表明，相位和幅度的变化可以作为诊断工具来确定HIPAS设施上方环境电子密度分布的特征。
The amplitude and phase of subionospherically propagating VLF signals are known to be sensitive indicators of the electron density and temperature at D region altitudes. In this paper we present new observations at a station in Alaska positioned to provide measurements of VLF signals that have propagated beneath the ionospheric region heated by the high-power auroral stimulation (HIPAS) HF heating facility near Fairbanks, Alaska. Analysis of data from HIPAS campaigns conducted in fall 1992 and spring 1993 has shown that in roughly 60% of the cases analyzed, the amplitude of the 23.4-kHz signal from the NPM transmitter in Hawaii as observed in Fort Yukon, Alaska, exhibited a measurable change in amplitude with the same on/off modulation pattern as that of the HIPAS HF transmissions at 2.85 MHz. In almost 70% of the cases analyzed, the same signal exhibited similar measurable changes in phase. The amplitude changes ranged from −0.2 dB to +0.5 dB, and the sensitivity of the measurement was approximately ± 0.02 dB. The phase changes ranged from −4.5° to −0.3°, and the sensitivity of the measurement was typically ± 0.4°. It is demonstrated that the phase and amplitude changes can be used as diagnostic tools to determine characteristics of the ambient electron density profile above the HIPAS facility.
A. Y. Wong、J. Carroll、R. Dickman、W. Harrison、W. Huhn、B. Lum、M. MacCarrick、J. Santoru、C. Schock、G. Wong 和 R. F. Wuerker：“位于
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