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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Magnetospheric MHD response to a localized disturbance in the ionosphere
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Magnetospheric MHD response to a localized disturbance in the ionosphere

机译：磁层MHD对电离层中局部干扰的响应

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A theory has been constructed for standing quasi-Alfven waves excited in the magnetosphere by a broadband source localized in the ionosphere. Formulas are obtained which describe the oscillation field of individual standing waves excited by a source arbitrarily distributed in the ionosphere and with an arbitrary behavior in time. It is shown that oscillations from an impulsive source that is narrowly localized across geomagnetic field lines can occur in two different regimes. The initial regime is characterized by the fact that the excited standing wave oscillates throughout the space with the same frequency. In the asymptotic regime, the oscillation field of the standing Alfven wave occupies a distinctly delineated region across field lines. At every point of the region the waves are oscillating with their eigenfrequency. A numerical calculation is made of the total field of standing quasi-alfven waves excited in the magnetosphere by an impulsive source localized in the ionosphere, It is shown that the fundamental harmonic of standing wa es reaches an asymptotic regime already after the first oscillation period. All other harmonics oscillate in the initial regime during many oscillation periods of the fundamental harmonic. Such a picture of the oscillations adequately depicts the MI-ID disturbances recorded as part of the active MASSA1 experiment (at 023100 UT on November 28, 1981) aboard the AUREOLE-3 satellite. The point at which the leading edge of a strong electromagnetic impulse was recorded is quite well associated with the equatorward boundary of localization of the fundamental harmonic of standing waves. The form and duration of the impulse recorded aboard the satellite is also adequately described. [References: 37]
机译：已经建立了一个理论，用于通过位于电离层中的宽带源在磁层中激发拟Alfven波。得到的公式描述了由任意分布在电离层中的源在时间上具有任意行为所激发的各个驻波的振荡场。结果表明，在两种不同的情况下，来自脉冲源的振荡会在地磁场线中狭窄地分布。初始状态的特征在于，激发的驻波以相同的频率在整个空间中振荡。在渐近状态下，Alfven驻波的振荡场占据了磁力线上的一个清晰描绘的区域。在该区域的每个点，波都以其本征频率振荡。对电离层局部脉冲源在磁层激发的准八波驻波的总场进行了数值计算，结果表明，驻波的基本谐波在第一个振荡周期后就已经达到了渐近状态。在基本谐波的许多振荡周期内，所有其他谐波都在初始状态下振荡。这样的振荡图足以描述在AUREOLE-3卫星上作为活动MASSA1实验的一部分（1981年11月28日在023100 UT）记录的MI-ID干扰。记录强电磁脉冲的前沿的点与驻波基波的局部化的赤道边界非常相关。还充分描述了记录在卫星上的脉冲的形式和持续时间。 [参考：37]

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