High-latitude HF Doppler observations of ULF waves. 1. Waves with large spatial scale sizes

Details High-latitude HF Doppler observations of ULF waves. 1. Waves with large spatial scale sizes High-latitude HF Doppler observations of ULF waves. 1. Waves with large spatial scale sizes

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997angeo..15.1548w&link_type=abstract

Annales Geophysicae, vol. 15, Issue 12, pp.1548-1556

Computer Science

Sound

18

Auroral Ionosphere, Magnetosphere-Ionosphere Interactions, Mhd Waves And Instabilities, Hf Doppler, Ulf Waves

Scientific paper

A quantitative study of observations of the ionospheric signatures of magnetospheric ultra low frequency (ULF) waves by a high-latitude (geographic: 69.6°N 19.2°E) high-frequency Doppler sounder has been undertaken. The signatures, which are clearly correlated with pulsations in ground magnetometer data, exhibit periods in the range 100-400 s and have azimuthal wave numbers in the range 3-8. They are interpreted here as local field line resonances. Phase information provided by O- and X-mode Doppler data support the view that these are associated with field line resonances having large azimuthal scale sizes. The relative phases and amplitudes of the signatures in the Doppler and ground magnetometer data are compared with a model for the generation of Doppler signatures from incident ULF waves. The outcome suggests that the dominant mechanism involved in producing the Doppler signature is the vertical component of an E × B bulk motion of the local plasma caused by the electric field perturbation of the ULF wave.

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