Geomagnetic pulsations observed simultaneously on three geostationary satellites

Details Geomagnetic pulsations observed simultaneously on three geostationary satellites Geomagnetic pulsations observed simultaneously on three geostationary satellites

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1109h&link_type=abstract

Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 1109-1116.

Physics

12

Geomagnetic Pulsations, Kelvin-Helmholtz Instability, Magnetic Field Configurations, Magnetopause, Satellite Observation, Azimuth, Diurnal Variations, Magnetometers, Synchronous Satellites

Scientific paper

Simultaneous observations of magnetic pulsations have been made by three geostationary satellites carrying similar magnetometers and acting as an azimuthal array. Autospectral and cross-spectral analysis yields coherence and phase differences between the pulsations at the satellite positions. The majority of the data fit the Kelvin-Helmholtz generation mechanism. The azimuthal wave number changes sign near noon and corresponds to propagation away from noon. Usually, the wave number is less than 10 deg per degree of longitude. Later in the afternoon, however, strong pulsations are observed with low coherence, implying large wave numbers. This suggests an instability driven by a gradient in the intensity of energetic protons, which may be expected at this local time. The data also suggest that some of the observed phase difference between the azimuthal components is due to small separations in magnetic shell, whereas this is not the case for the radial components. This implies a localized field-line resonance.

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