Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51b..08k&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM51B-08
Physics
2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 2149 Mhd Waves And Turbulence
Scientific paper
Observations of ULF pulsations at multiple, discrete frequencies inside the magnetosphere have been used to suggest that the magnetospheric cavity can act like a cavity or waveguide. In these models, internal magnetospheric properties such as magnetic field strength and size of the resonant cavity determine the spectral characteristics of magnetic oscillations. Whether the solar wind can sometimes contain power at discrete frequencies and drive ULF oscillations was recently examined by Kepko et al. [2002]. They presented two events in which discrete oscillations at frequencies < 2 mHz were observed in the solar wind number density far upstream and in the magnetic field strength inside the magnetosphere. In this paper we extend this analysis and present several events in which discrete oscillations were observed in both the solar wind and magnetosphere for several hours. We suggest that the long-period oscillations of the solar wind number density (and hence, dynamic pressure) slowly alter the size and magnetic field of the magnetospheric cavity, thereby leading to a forced "breathing" of the magnetosphere.
Kepko Larry
Spence Harlan E.
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