Global Pi3 geomagnetic pulsations as a response of large variations in the solar wind and IMF during the magnetic storm of August 5, 2011

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• 作者：N. G. Kleimenova (1)
  O. V. Kozyreva (1)
  
• 刊名：Geomagnetism and Aeronomy
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：54
• 期：2
• 页码：195-202
• 全文大小：336 KB
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• 作者单位：N. G. Kleimenova (1)
  O. V. Kozyreva (1)
  
  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia
  
• ISSN：1555-645X

文摘

Spatial-temporal and spectral features of ground geomagnetic pulsations in the frequency range of 1- mHz at the initial phase of a strong magnetic storm of the 24th cycle of solar activity (August 5-, 2011, with a Dst-variation in the storm maximum of ?10 nT) are analyzed. Large opposite in sign amplitudes of variations in IMF parameters (from ?0 to +20 nT) at a high velocity of the solar wind (?50 km/s) accompanied by intense bursts in solar-wind density (up to ?0 cm?) were distinctive feature of interplanetary medium conditions causing the storm. Geomagnetic Pi3 pulsations global in longitude and latitude and in-phase in the middle and equatorial latitudes were found. The onset of pulsation generation was caused by a pulse of dynamic pressure of the solar wind (?0 nPa), i.e., by a considerable compression of the magnetosphere. The maximum (2- mHz) in the amplitude spectrum of near-equatorial pulsations coincided with the maximum of pulsations in the daytime polar cap. After the next jump of the dynamic pressure of the solar wind (?5 nPa), an additional maximum appeared in the pulsation spectrum in the frequency band of ?.5-.5 mHz. Global pulsations suddenly stopped after a sharp decrease in the solar-wind dynamic pressure and corresponding extension of the magnetosphere. The obtained results are compared with the time dynamics of the position and shape of the plasmapause.