Magnetospheric disturbances excited by solar wind density enhancements on April 11, 1997 |
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| Authors: | N A Zolotukhina |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, Siberian Division, Russian Academy of Sciences, P.O. Box 4026, Irkutsk, 664033, Russia |
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| Abstract: | Disturbances in the solar wind density, geomagnetic field, and magnetospheric plasma density and fluxes are analyzed. The disturbances have the same sign and are close to each other in time. They accompany the process of amplitude modulation of Pc1 geomagnetic pulsations during the recovery phase of the moderate magnetic storm of April 10–11, 1997. The magnetospheric disturbances were recorded by ground-based observatories and on spacecraft in all local time sectors with insignificant time delays. It is concluded that in this case variations in the geomagnetic field and magnetospheric plasma density are primary, whereas the amplitude modulation of Pc1, 2 is a secondary manifestation of fast magnetosonic (FMS) waves that are generated during the interaction between the magnetosphere and solar wind density irregularities. |
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