Bursts of geomagnetic pulsations in the frequency range 0.2-5 Hz excited by large changes of the solar wind pressure |
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| Authors: | V A Parkhomov G N Zastenker M O Riazantseva B Tsegmed T A Popova |
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| Institution: | 1.Baikal State University,Irkutsk,Russia;2.Space Research Institute,Russian Academy of Sciences,Moscow,Russia;3.Institute of Solar-Terrestrial Physics,Siberian Branch of Russian Academy of Sciences,Irkutsk,Russia;4.Skobeltsyn Institute of Nuclear Physics,Moscow State University,Moscow,Russia;5.Polar Geophysical Institute,Kola Research Center of Russian Academy of Sciences,Apatity,Russia;6.Center of Research in Geophysics and Astronomy,Mongolian Academy of Sciences,Ulan Bator,Mongolia |
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| Abstract: | We present the results of studying the magnetospheres’s response to sharp changes of the solar wind flow (pressure) based
on observations of variations of the ions flux of the solar wind onboard the Inreball-1 satellite and of geomagnetic pulsations (the data of two mid-latitude observatories and one auroral observatory are used).
It is demonstrated that, when changes of flow runs into the magnetosphere, in some cases short (duration ~ < 5 min) bursts
of geomagnetic pulsations are excited in the frequency range Δf~ 0.2–5 Hz. The bursts of two types are observed: noise bursts without frequency changes and wide-band ones with changing
frequency during the burst. A comparison is made of various properties of these bursts generated by pressure changes at constant
velocity of the solar wind and by pressure changes on the fronts of interplanetary shock waves at different directions of
the vertical component of the interplanetary magnetic field. |
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