Arase卫星观测到的哨声模式波的导管传播

IF 2.9 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Y. Ampuku, F. Tsuchiya, S. Kurita, Y. Kasaba, Y. Katoh, M. Fukizawa, Y. Miyoshi, I. Shinohara, Y. Kasahara, S. Matsuda, A. Kumamoto, A. Matsuoka, M. Kitahara, O. Santolík
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引用次数: 0

摘要

哨子模波的导管传播引起了人们的关注,因为这一过程解释了哨子模波如何传播到高纬度地区,导致相对论性电子向大气损失,以及由于电子沉淀而导致高层大气的变化。然而,很少有研究将观测到的密度管道和波的传播特性与理论预测进行详细的比较,特别是对低密度管道。我们提出了四种随电子密度增加或减少的传导模式,正如Arase卫星所观察到的那样。(a)低波段(LB)波沿着具有小波法向角(wna)的高密度管道传播,(b) LB波沿着具有宽波法向角分布的低密度管道传播,直至Gendrin角以上,(c) LB波沿着具有小波法向角的低密度管道传播,(d)高波段波沿着具有小波法向角的低密度管道传播。我们推导了这些病例的wna,它们的特征与导管理论一致。根据这一理论,我们计算了波可能被困在管道中的频率范围。我们将这个频率范围与记录的哨声模式波的功率谱进行了比较,发现理论和观测结果之间存在一致性。此外,基于简单模拟波形和观测数据的WNA分析比较,我们认为(b)和(c)的WNA具有方位角分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ducted Propagation of Whistler Mode Waves Observed by the Arase Satellite

Ducted Propagation of Whistler Mode Waves Observed by the Arase Satellite

Ducted propagation of whistler-mode waves has attracted attention as a process that explains how whistler-mode waves propagate to high latitudes, resulting in the loss of relativistic electrons to the atmosphere and changes in the upper atmosphere due to electron precipitation. However, few studies have compared the observed density ducts and wave propagation characteristics to theoretical predictions in detail, particularly for low-density ducts. We present four patterns of ducting modes as electron density increases or decreases, as observed by the Arase satellite. (a) Lower-band (LB) waves propagating along a high-density duct with small wave normal angles (WNAs), (b) LB waves propagating along a low-density duct with a wide distribution of WNAs up to above the Gendrin Angle, (c) LB waves propagating along a low-density duct with WNAs around the Gendrin Angle, and (d) upper-band waves propagating along a low-density duct with small WNAs. We derived the WNAs for these cases, and their characteristics were consistent with the ducting theory. Based on this theory, we calculated the frequency range in which the waves were likely to be trapped in the ducts. We compared this frequency range with the power spectra of the recorded whistler-mode waves and found consistency between the theory and observations. Furthermore, it is suggested that the WNAs for cases (b) and (c) have azimuthal distributions based on a comparison of the WNA analysis of the simple simulated waveforms and the observed data.

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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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