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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Geomagnetic negative sudden impulse due to a magnetic cloud observed on May 13, 1995
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Geomagnetic negative sudden impulse due to a magnetic cloud observed on May 13, 1995

机译:1995年5月13日观察到由于磁云引起的地磁负突然脉冲

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摘要

A geomagnetic negative sudden impulse (SI-) observed on May 13, 1995, was examined using magnetic field data from ETS VI and GOES 7 in the magnetosphere and ground geomagnetic observation networks. The SI- was caused by a sudden decrease ill the solar wind dynamic pressure at the front boundary of a magnetic cloud embedded in a density enhancement region. The amplitude and the fall time at Kakioka geomagnetic observatory (magnetic latitude 26.9 degrees, magnetic longitude 208.3 degrees) were 26 nT and 10 min, respectively. Although SI- has been considered to be the mirror image of geomagnetic positive sudden impulse (SI+) or sudden commencement (SC), we found the polarization distribution of the SI- consistent with that of SC. We suggest that the contribution from the longitudinal movement of a twin-vortex ionospheric current system is dominant to produce the polarization of SC and SI-. We also discuss the relationship between the angle at which discontinuities in the solar wind impinge upon the magnetosphere and the geomagnetic response. [References: 18]
机译:使用磁层和地面地磁观测网络中ETS VI和GOES 7的磁场数据,对1995年5月13日观测到的地磁负突然脉冲(SI-)进行了检查。 SI-是由嵌入密度增强区域的磁云的前边界处太阳风动压突然降低引起的。 Kakioka地磁观测站(磁纬度26.9度,磁经度208.3度)的振幅和下降时间分别为26 nT和10分钟。尽管SI-被认为是地磁正突波脉冲(SI +)或突波爆发(SC)的镜像,但我们发现SI-的极化分布与SC的极化分布一致。我们认为,来自双涡旋电离层电流系统纵向运动的贡献对于产生SC和SI-的极化起主要作用。我们还讨论了太阳风的不连续性撞击磁层的角度与地磁响应之间的关系。 [参考:18]

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