Magnetospheric ULF waves observed during the major magnetospheric compression of November 1, 1984

Physics

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Ampte (Satellites), Earth Magnetosphere, Extremely Low Radio Frequencies, Geomagnetism, Magnetohydrodynamic Waves, Plasma Compression, Magnetopause, Plasma Oscillations, Solar Wind, Standing Waves

Scientific paper

The magnetospheric ULF waves observed during the magnetospheric compression event of November 1, 1984, were investigated using the magnetic field and medium-energy ion data obtained by the AMPTE Charge Composition Explorer. The electric field of ULF waves was inferred from the particle data, using a method developed on the basis of the gyration acceleration mechanism. Three types of waves were found: (1) a 10-15-min wave with perturbations in the magnetic field intensity and in the flux of ions; (2) a 3-5-min standing Alfven wave with perturbations in the azimuthal magnetic field component and in the radial component of the electric field; and (3) a 2-5-min irregular disturbance near the magnetopause, which involves all components of the magnetic field and the intensity of the ion flux. The origins of these waves are discussed.

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