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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Spread in aspect angles of equatorial E region irregularities
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Spread in aspect angles of equatorial E region irregularities

机译：传播角度方面的赤道地区违规行为

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摘要

We revisit and extend the 50 MHz radar aspect angle study made in Peru by Kudeki and Farley in 1985, taking advantage of upgraded facilities at Jicamarca. We discuss here (1) type 1 and 2 echoes from the electrojet region, (2) early evening echoes from somewhat above the electrojet, and (3) daytime “150 km” echoes from the ～145 to 170 km altitude region. Our electrojet data (1) confirm the earlier results for weak type 2 conditions, namely, that the rms aspect angle rms decreases from about 0.3° at 99 km to slightly less than 0.2° at 108 km, and (2) provide much more information about the aspect angles of type 1 echoes and the apparent nonlinear interaction between type 1 waves and slower waves. Type 1 waves, with phase velocities near the ion-acoustic velocity, have rms decreasing from about 0.15° near 104 km to about 0.10° near 110 km. There is strong evidence that horizontally traveling type 1 waves in the upper midday electrojet, where upward electron density gradients are absent, can sometimes nonlinearly couple to slow, vertically traveling waves with aspect angles sometimes larger than 0.5°. In the early evening we often observe echoes in the 125–135 km region with rms ≤ 0.05°. During daytime the relatively weak “150 km” echoes have even smaller rms. At the end of the paper we discuss ideas concerning the nonlinear coupling of the plasma waves.
机译：我们重新审视和延长50兆赫雷达方面在秘鲁的角度研究Kudeki和法利1985年,利用升级设施Jicamarca。回声从电喷流区域,(2)晚上从上面有些回声电喷流,(3)白天“150公里”的回声145 ~ 170公里的高度。电喷流数据(1)早些时候确认结果对弱2型条件,即均方根方面从99年约0.3°角均方根降低公里略低于0.2°108公里,和(2)提供了更多有关方面的信息角度1型和明显的回声1型波和非线性相互作用慢波。附近的离子声波速度,rms减少从约0.15°附近约104公里0.10°附近110公里。水平1型波上旅行中午电喷流,向上的电子密度梯度缺席,有时非线性慢,垂直波与旅行方面的角度有时比0.5°。傍晚我们经常观察的回声125 - 135公里地区rms≤0.05°。白天有相对较弱的“150公里”的回声更小的均方根。讨论想法关于非线性耦合的等离子体波。

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