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Pi 2 pulsations at low latitudes are examined with magnetic fields data at the 210° magnetic meridian (MM) stations in 1991. Due to high degree of coherence over most latitudes, 68 low-latitude Pi 2 events at the 210° MM stations are identified with reference to same waveforms on the magnetogram at Lunping (189.5° MM, L = 1.06). With spectral power analysis, the ratio of the first four harmonic frequencies...
We present an evidence of the coupling of a fast magnetospheric cavity mode to field line resonances. The power of filtered H and D components of Pi 2 pulsations during March–April in 1978 and 1979 from IGS chain in the United Kingdom (UK) shows that there are two enhancements located near L = 3.5 and 5.5 in the distribution profile. The irreversible hydromagnetic wave coupling is studied by using...
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