Dayside magnetospheric ULF wave frequency modulated by a solar wind dynamic pressure negative impulse

Dayside magnetospheric ULF wave frequency modulated by a solar wind dynamic pressure negative impulse
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太阳风动压负脉冲调制的日侧磁层 ULF 波频率

DOI:
10.1002/2016ja023351
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发表时间:
2017-02
期刊:
Journal of Geophysical Research Space Physics
影响因子:
--
通讯作者:
Z Y Pu
Z Y Pu
中科院分区:
其他
文献类型:
--
作者:
M K Hudson;H Z Wang;S Y Fu;Z Y Pu

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超低频波在太阳风向磁层的传输中起着重要的作用。在本文中,我们展示了在2010年1月11日0756 UT左右,当观测到太阳风动压下降(从~ 5到~ 2 nPa)时,日侧磁层的ULF波事件显示频率从3.1突然下降到2.3 mHz。波在全球范围内存在。电场和磁场的相位差表明,在波频降低前后,纵波是静止的。这一结果表明,极低频波应该与空腔模式有关,而频率的降低可能是由空腔尺寸的变化引起的。对腔模频率进行了理论计算。计算得到负冲量前后的波频为3.8/2.6 mHz,与观测值一致。
Ultralow frequency (ULF) waves play an important role in the transport of the solar wind energy to the magnetosphere. In this paper, we present a ULF wave event in the dayside magnetosphere which shows a sudden decrease in frequency from 3.1 to 2.3 mHz around 0756 UT on 11 January 2010, when a solar wind dynamic pressure drop (from ∼5 to ∼2 nPa) was observed simultaneously. The wave exits globally. The phase differences between electric and magnetic fields indicate that the compressional mode wave is standing before and after the wave frequency decrease. This result suggests that the ULF wave should be associated with a cavity mode and the frequency decrease might be induced by the change of the cavity size. A theoretical calculation was made to estimate the cavity mode frequency. The calculated wave frequency before/after the negative impulse is 3.8/2.6 mHz, which is consistent with the observations.
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