Islam Hawash, Essam Ghamry, Susan W. Samwel, Muhamed Yousef Omar, Hala El-Desoky
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引用次数: 0
摘要
据观测，当磁层处于接近地面状态，亚暴活动预计已经停止时，Pi2 磁脉冲会在低纬度地区发生。在本研究中，我们首次报告了在太阳耀斑事件期间发生的全球非亚暴 Pi2 磁微脉冲。我们在两个不同地点对 Pi2 进行了研究：利用 Van Allen Probe A（VAP-A）卫星在内磁层，以及位于日韩、非洲和美洲扇区的地面磁站。通过将地面站的水平分量与磁层内的电分量和磁分量进行比较，我们报告了在 2017 年 9 月 6 日 12:02 UT 的 X9.3 级太阳耀斑抛射期间，从 12:05 UT 附近开始持续到 12:11 UT 的全球 Pi2。我们通过小波分析研究了垣冈（KAK）站和VAP-A卫星的Pi2振荡。通过分析高纬度台站，我们发现Pi2事件与极向边界强化（PBI）有很好的相关性。
Investigation of non-substorm Pi2 magnetic pulsation during solar flare event
Pi2 magnetic pulsations have been observed to occur at low latitudes when the magnetosphere is in a near ground state and substorm activity would be expected to have ceased. In the present study, we report a global non-substorm Pi2 magnetic micro-pulsations occurred, for the first time, during a solar flare event. We investigate this Pi2 at two different locations: in the inner magnetosphere using Van Allen Probe A (VAP-A) satellite, and ground-based magnetic stations located in Japan-Korea, Africa, and America sectors. By comparing the horizontal component of ground stations with the electric and magnetic components within the magnetosphere, we report a global Pi2 starting nearby at 12:05 UT lasting to 12:11 UT during the ejection of a solar flare with X9.3-class that have had its peak flux at 12:02 UT on 6 September 2017. We study the Pi2 oscillations at Kakioka (KAK) station and VAP-A satellite through wavelet analysis. By analyzing the high-latitude stations, we find that the Pi2 event has a good correlation with a Poleward Boundary Intensification (PBI).
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Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered.
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