Magnetospheric ULF waves directly driven by solar wind oscillations: An observational assessment

Details Magnetospheric ULF waves directly driven by solar wind oscillations: An observational assessment Magnetospheric ULF waves directly driven by solar wind oscillations: An observational assessment

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm33b1338c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM33B-1338

Physics

2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The Ultra-low-frequency (ULF) waves in the magnetosphere play an important role in energizing the radiation belt particles. Understanding how the solar wind directly and indirectly generates ULF waves in the magnetosphere can help build an empirical model of ULF spectrum that is based solely on the solar wind data. It is well understood that various macro-scale solar wind conditions can favor the excitation of ULF waves. The Kelvin- Helmholtz instability during high-speed solar wind and the dayside and nightside reconnections during southward IMF are two examples for the indirect association between the solar wind and magnetospheric ULF waves. In recent years, an increasing amount of attention is paid to the direct driving of magnetospheric ULF waves by solar wind oscillations. These ultra-low-frequency oscillations in the solar wind may originate in part from the normal-mode oscillations of the Sun. In this study we assess the importance of the solar wind oscillations in directly driving the magnetospheric ULF waves by examining the correlation between the solar wind and magnetospheric observations. The data include the high-cadence interplanetary field records collected by the ACE spacecraft, the magnetic field data from Polar and GOES satellites, and the ground magnetometer data from the Mid-continent Magnetoseismic Chain (McMAC).

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