Investigation of the chevron structure of some Pc1 pulsations

Details Investigation of the chevron structure of some Pc1 pulsations Investigation of the chevron structure of some Pc1 pulsations

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..197g&link_type=abstract

Geophysical Research Letters, vol. 6, Mar. 1979, p. 197-200.

Physics

Earth Magnetosphere, Fine Structure, Geomagnetic Pulsations, Monochromatic Radiation, Spectrum Analysis, Digital Filters, Extremely Low Radio Frequencies, Helium Plasma, Magnetic Storms, Spectrograms

Scientific paper

A new variety of fine frequency structure of some Pc1 geomagnetic pulsations has been recently reported. For these pulsations, each periodic element consists of a chevron-shaped combination of rising and falling tones. A careful spectral analysis of one of these events, based upon a new numerical technique known as the Modified Moving Window Method (MMWM) allows us to establish the reality of this structure. This is tentatively interpreted in terms of propagation in a magnetospheric plasma containing a non negligible fraction of helium ions, the presence of helium ions resulting in a minimum in the ULF group velocity between the ion hybrid and ion crossover frequencies.

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