Global magnetospheric-ionospheric oscillations initiated by a solar wind pressure impulse

Details Global magnetospheric-ionospheric oscillations initiated by a solar wind pressure impulse Global magnetospheric-ionospheric oscillations initiated by a solar wind pressure impulse

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1232h&link_type=abstract

Journal of Geophysical Research Space Physics, Volume 108, Issue A6, pp. SMP 7-1, CiteID 1232, DOI 10.1029/2002JA009465

Physics

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Ring Current, Ionosphere: Ionospheric Disturbances

Scientific paper

We present simultaneous observations of long-period (~1 hour) global magnetospheric-ionospheric oscillations with multiple spacecraft and ground-based instruments. These oscillations occurred following a major increase in the solar wind dynamic pressure. When the solar wind pressure impulse impinged on the magnetosphere, oscillations of energetic plasma particles in the ring current region were excited. The strongest oscillations came from electrons in the energy range of 75-225 keV with periods of 55-80 min. Ground magnetometers measured periodic (~1 hour) enhancements of ionospheric currents from the auroral to equatorial latitudes. However, the solar wind pressure and IMF in this event did not show variations similar to the energetic particle oscillations and/or ground magnetometer deviations. We suggest that the magnetosphere has an intrinsic period of ~1 hour during quiet times. The magnetospheric oscillations with this period can be initiated by a solar wind pressure impulse. After the initiation the solar wind no longer plays a role in the subsequent evolution of the magnetospheric oscillations.

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