Geosynchronous magnetic field response to the large and fast solar wind dynamic pressure change |
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Authors: | NL Borodkova JB Liu ZH Huang GN Zastenker |
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Institution: | 1. Space Research Institute Russian Academy of Sciences, 84/32, Profsouznaya Street, 117997 Moscow, Russia;2. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, PR China |
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Abstract: | We present a comparison of large and sharp solar wind dynamic pressure changes, observed by several spacecraft, with fast disturbances in the magnetospheric magnetic field measured by the GOES-8, 9 and 10 geosynchronous satellites. Almost 400 solar wind pressure changes in the period 1996–2003 were selected for this study. Using the large statistics we confirmed that increases (decreases) in the dynamic pressure always results in increases (decreases) in the magnitude of geosynchronous Bz component. The amplitude of the geosynchronous Bz response strongly depends on the location of observer relative to the noon meridian, from the value of solar wind pressure before the disturbance arriving and firstly – from the amplitude of the pressure change. |
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Keywords: | Solar wind pressure Geosynchronous magnetic field 3D MHD simulation |
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