Ionospheric signatures of cusp-latitude Pc 3 pulsations
Ionospheric signatures of cusp-latitude Pc 3 pulsations
复制标题
尖点纬度 Pc 3 脉动的电离层特征
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
R. Arnoldy
中科院分区：
文献类型：
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作者：
M. Engebretson;L. J. Cahill;R. Arnoldy
地球磁层中的许多扰动，如极光亚暴，都是对太阳风变化的反应，太阳风不断地从太阳扫过地球和其他行星。过去几年的研究，最近由Odera（1986）和Arnoldy在el。（1988）的研究表明，pc3脉动（地球磁场中周期在15到40秒之间的一类超低频率波）也与地球上游的太阳风活动直接相关。作者在本报告中介绍了来自南极洲南极站的新观测结果，南极站每天有几个小时位于磁层裂缝/尖区标称位置之下。有充分的证据表明，来自行星际空间的等离子体可以穿透到尖端区域的电离层高度。两篇基于南极数据的早期论文指出，当行星际磁场接近地球-太阳方向（低行星际磁场锥角）时，在南极站发生了大振幅，窄带pc3磁脉动。他们现在也在其他南极仪器的数据中发现了这些脉动的证据。«少
It has been well established that many of the disturbances in the Earth's magnetosphere, such as auroral substorms, are a response to variations in the solar wind that continually sweeps from the Sun past the Earth and other planets. Studies over the past several years, most recently reviewed by Odera (1986) and Arnoldy at el. (1988), have shown that Pc 3 pulsations, a class of ultra-low-frequency waves in the Earth's magnetic field with periods between 15 and 40 seconds, are also directly related to activity in the solar wind just upstream of the Earth. The authors present in this report new observations from South Pole Station, Antarctica, which during certain hours every day is located under the nominal position of the magnetospheric cleft/cusp region. There has been ample evidence that plasmas from interplanetary space can penetrate to ionospheric altitudes in the cusp region. Two earlier papers based on South Pole data noted that large-amplitude, narrowband Pc 3 magnetic pulsations occurred at South Pole Station near local magnetic noon when the interplanetary magnetic field was aligned near the Earth-Sun direction (low interplanetary magnetic field cone angle). They have now found evidence of these pulsations in data from other South Pole instrumentsmore » as well.« less