Extreme Poleward Expanding Super Plasma Bubbles Over Asia‐Pacific Region Triggered by Tonga Volcano Eruption During the Recovery‐Phase of Geomagnetic Storm

Extreme Poleward Expanding Super Plasma Bubbles Over Asia‐Pacific Region Triggered by Tonga Volcano Eruption During the Recovery‐Phase of Geomagnetic Storm
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地磁风暴恢复阶段汤加火山喷发引发亚洲太平洋地区极向膨胀超等离子气泡

DOI:
10.1029/2022gl099798
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发表时间:
2022
影响因子:
5.2
通讯作者:
Nishioka, M.
Nishioka, M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Rajesh, P. K.;Lin, C. C.;Lin, J. T.;Lin, C. Y.;Liu, J. Y.;Matsuo, T.;Huang, C. Y.;Chou, M. Y.;Yue, J.;Nishioka, M.

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汤加火山在2022年1月15日的喷发释放了各种各样的大气扰动,与地磁风暴的恢复阶段相吻合。随后的热层变化创造了罕见的极端极向扩展的共轭等离子体气泡,在100-150°E的总电子含量指数率中可以看到,达到地理纬度约40°N。这与FORMOSAT‐7/COSMIC‐2 (F7/C2)离子密度测量和离子图中的spread‐F波动有关。在此之前,F7/C2观测得到的全球电离层规范(GIS)电子密度剖面出现了异常强烈的预反转增强(pre - reversal enhancement, pre)。GIS还显示,由于风暴的影响,赤道电离异常(EIA)波峰密度减小。火山引起的波降低了E区电导率,F区风增强,EIA上离子阻力的减少进一步加速了E区电导率的增强,明显地加剧了PRE。伴随着强PRE,火山引起的种子扰动触发了超级等离子体气泡活动。
The Tonga volcano eruption of 15 January 2022 unleashed a variety of atmospheric perturbations, coinciding with the recovery‐phase of a geomagnetic storm. The ensuing thermospheric variations created rare display of extreme poleward‐expanding conjugate plasma bubbles seen in the rate of total electron content index over 100–150°E, reaching ∼40°N geographic latitude. This is associated with fluctuations in FORMOSAT‐7/COSMIC‐2 (F7/C2) ion‐density measurements and spread‐F in ionograms. Preceding to this, an unusually strong pre‐reversal enhancement (PRE) occurred in the global ionospheric specification (GIS) electron density profiles derived from F7/C2 observations. The GIS also revealed a decrease of equatorial ionization anomaly (EIA) crest density due to the storm impact. Reduced E‐region conductivity by volcano‐induced waves and enhanced F‐region wind, further accelerated by reduced ion‐drag over the EIA, apparently intensified the PRE. Accompanied with the strong PRE, volcano‐induced seed perturbations triggered the super plasma bubble activity.
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