Classification of geomagnetic micropulsations

By J. Jacobs, Y. Kato, S. Matsushita, V. Troitskaya. 2007

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Cluster observations of EMIC triggered emissions in association with Pc1 waves near Earth's plasmapause (2010, background): “[2] Electromagnetic Ion Cyclotron (EMIC) waves in the Pc1 frequency range (0.2 to 5 Hz) [Jacobs et al., 1964] were first observed in 1936 at high latitude ground stations [Harang, 1936; Sucksdorff, 1936].”
Space Weather Effects in the Earth’s Radiation Belts (2018, background): “…when the first two adiabatic invariants are preserved in the outer zone whereas the third and slowest gradient curvature drift invariant is violated by particle–wave processes through the presence of ultralow-frequency (ULF) waves in the Pc-5 range between ∼1.67 and ∼6.67 mHz (Jacobs et al. 1964).”
Magnetic Pulsations: Their Sources and Relation to Solar Wind and Geomagnetic Activity (2005, methodology): “In 1963, an IAGA committee classified ULF waves using a system dependent on waveform and wave period (Jacobs et al., 1964).”
The Upgraded CARISMA Magnetometer Array in the THEMIS Era (2008, methodology): “Continuous magnetic field fluctuations in the frequency range from 0.2 to 5 Hz are classified as Pc1 pulsations (Jacobs et al. 1964).”
Solar wind driving of magnetospheric ULF waves: Pulsations driven by velocity shear at the magnetopause (2008, background): “5–15 mHz (Pc4–Pc5 bands, as defined by Jacobs et al. [1964]).”