Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm41b..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM41B-08
Physics
2700 Magnetospheric Physics (6939), 2774 Radiation Belts, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Before we investigate magnetospheric responses to various solar wind changes including IMF and dynamic pressure, it is essential to understand fundamental properties of the magnetospheric responses for simple solar wind variations. For this purpose, a global MHD model is a unique and powerful tool because we can assign any solar wind variations in the model [e.g., Tanaka, 1995]. In the present study, we investigate the magnetospheric response to periodic variations in the solar wind dynamic pressure with various time scales. Through the simulation. we obtain the following results. "EThe magnetosheath is a buffer of the magnetosphere against short-period solar wind dynamic pressure variations. "EThe shorter-period variations, the MHD-wave process is dominant in the magnetosphere. On the other hand, for the longer-period one, the magnetospheric process is associated with slowly varying convection system in the magnetosphere-ionosphere system. The criterion between the shorter and longer period is about 5 minutes. "EFor shorter-period variations, spectral characteristics of the ground magnetic variations reflect those of the solar wind variation. Note that the field line resonances must be superposed on these spectral characteristics. "EFor longer-period variations, the spectral characteristics of the ground magnetic variations are different from those of the solar wind variations. The ground magnetic variations have higher-harmonic spectral components of the original one of the solar wind variations. This is independent of the field line resonance mechanism.
Fujita Shigeo
Motoba Tetsuo
Tanaka Toshiaki
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