Unusual Generation of Localized EPB in the Dawn Sector Triggered by a Moderate Geomagnetic Storm

S. Sripathi; M. A. Abdu; A. K. PatraR. N. Ghodpage

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Unusual Generation of Localized EPB in the Dawn Sector Triggered by a Moderate Geomagnetic Storm

机译：不寻常的一代的本地化EPB的黎明部门由一个温和的地磁风暴

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An interesting piece of observation related to the equatorial plasma bubble (EPB) that is triggered by a geomagnetic storm at dawn sector on 4–5 February 2011 is presented. The storm activity was initiated at 17 UT when interplanetary magnetic field (IMF) Bz turned southward and the Dst index started decreasing (accompanied by AE intensifications) attaining its minimum at -70 nT. The IMF Bz presented large fluctuations marked by southward/northward transitions at slow and rapid rates and eventually returning to normal in the morning of 5 February. Observations from the very high frequency radar located at Gadanki, an off-equatorial station; an all-sky imager located at Kolhapur, a low-latitude station; and an ionosonde at Tirunelveli, an equatorial station, are analyzed to study the impact of this storm on the postmidnight to presunrise equatorial spread F. The results demonstrate that EPB irregularities can be generated by penetration electric field during what can be characterized as a moderate storm event. In contrast to prevailing belief, the present results show that EPB/equatorial spread F can be generated by undershielding electric field in the dawn sector, caused by an unusually delayed polarity reversal of the penetration electric field. The results further reveal oscillatory behavior in the height of F layer topside irregularities in association with IMF Bz oscillations. Observation of radar echoes from nighttime E layer irregularity structures and their Doppler velocities representing the penetration electric field polarity and intensity are also a notable finding of this paper.

机译：一个有趣的观察相关赤道等离子体引发的泡沫(EPB)在黎明时分磁暴部门在4 - 52011年2月。17岁开始当星际UT磁场(IMF) Bz转身向南和Dst指数开始下降(伴随着AE强化)实现其最低-70nT。IMF Bz呈现大幅波动被南/北转换慢和快速率,最终回归在2月5日的早晨。从高频雷达位于off-equatorial站Gadanki;低纬度成像仪位于戈尔站;赤道站,进行了分析研究在postmidnight这场风暴的影响presunrise赤道扩展f .结果证明EPB违规行为所产生的电场在渗透可以用温和的暴风雨呢事件。目前的结果表明,EPB /赤道扩展F可以由下部挡板电场在黎明的部门,由异常引起的延迟极性倒转的渗透电场。在电离层的高度振荡行为上部违规行为与国际货币基金组织(IMF)振荡。夜间和E层不规则结构多普勒速度代表渗透电场极性和强度也是一个值得注意的发现。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2018年第11期|9697-9710|共14页
作者
S. Sripathi; M. A. Abdu; A. K. PatraR. N. Ghodpage;
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作者单位

MF Radar Center, Indian Institute of Geomagnetism, Shivaji University, Kolhapur, India;

Instituto Tecnológico de Aeronáutica and Instituto Nacional de Pesquisas Espaciais, S?o José dos Campos, Brazil;

National Atmospheric Research Laboratory, ISRO, DOS, Gadanki, IndiaIndian Institute of Geomagnetism, New Bombay, India;

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正文语种英语
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关键词
magnetic storms; Dst Index; geomagneticElectric fieldsSTATIONSRadar reflectionIonosondesequatorialSectoring;

机译：磁性风暴,Dst指数;geomagneticElectricreflectionIonosondesequatorialSectoring;

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Unusual Generation of Localized EPB in the Dawn Sector Triggered by a Moderate Geomagnetic Storm

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