The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions

S.Lepidi; P.Francia; U.Villante; A.Meloni; A. J.Lazarus; R. P.Lepping

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The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions

机译：1997年4月11日日冕射出的地球通道：在北向行星际磁场条件下高纬和低纬处的地磁场波动

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An analysis of the low frequency geomagneticfield fluctuations at an Antarctic (Terra Nova Bay) and a low latitude(L'Aquila, Italy) station during the Earth's passage of a coronal ejecta onApril 11, 1997 shows that major solar wind pressure variations were followed atboth stations by a high fluctuation level. During northward interplanetarymagnetic field conditions and when Terra Nova Bay is close to the localgeomagnetic noon, coherent fluctuations, at the same frequency (3.6 mHz) andwith polarization characteristics indicating an antisunward propagation, wereobserved simultaneously at the two stations. An analysis of simultaneousmeasurements from geosynchronous satellites shows evidence for pulsations atapproximately the same frequencies also in the magnetospheric field. Theobserved waves might then be interpreted as oscillation modes, triggered by anexternal stimulation, extending to a major portion of the Earth's magnetosphere.Key words. Magnetospheric physics (MHD waves andinstabilities; solar wind-magnetosphere interactions)

机译：对1997年4月11日地球通过日冕喷射时南极（Terra Nova湾）和低纬度（意大利拉奎拉）站的低频地磁场波动的分析表明，两者都遵循了主要的太阳风压变化电台的波动水平较高。在北向行星际磁场条件下，当Terra Nova湾靠近局部地磁正午时，在两个站同时观测到在相同频率（3.6 mHz）上具有指示反日传播的极化特性的相干波动。对来自地球同步卫星的同步测量的分析表明，在磁层磁场中，脉动的频率也大致相同。观测到的波然后可能被解释为由外部刺激触发的振荡模式，扩展到地球磁层的大部分。关键词。磁层物理（MHD波和不稳定性;太阳风-磁层相互作用）

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《Annales Geophysicae》 |1999年第10期|共6页
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S.Lepidi; P.Francia; U.Villante; A.Meloni; A. J.Lazarus; R. P.Lepping;
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The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions

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