Effects in the Geomagnetic Field and Absorption of Cosmic Radio Emission Caused by the Negative Pressure Discontinuity of the Solar Wind: Analysis of a Particular Event |
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| Authors: | O I Shumilov E A Kasatkina N G Kleimenova |
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| Institution: | 1.Polar Geophysical Institute of the Russian Academy of Sciences,Apatity, Murmansk oblast,Russia;2.Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences,Moscow,Russia;3.Institute of Cosmic Research of the Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | An abrupt decrease in the solar wind pressure and its effect on the magnetosphere and ionosphere during the event occurring on April 4, 1971, are studied. This event differs fundamentally from a typical sudden commencement (SC) of a geomagnetic storm or from a positive sudden impulse (SI+) and is determined as a negative sudden impulse (SI–). The geomagnetic variations at different latitudes and the cosmic radio emission in the auroral zone are analyzed. From the data of low-latitude geomagnetic observatories, several subsequent negative impulses observed with a periodicity of ~45 min were found. At the same time, a sudden decrease in the absorption of cosmic radio emission in the auroral zone was revealed. Possible physical explanations of the observed changes are discussed. |
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