High resolution bistatic HF radar observations of ULF waves in artificially generated backscatter

Details High resolution bistatic HF radar observations of ULF waves in artificially generated backscatter High resolution bistatic HF radar observations of ULF waves in artificially generated backscatter

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2825w&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 18, p. 2825-2828

Physics

10

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Instruments And Techniques, Ionosphere: Ionospheric Irregularities, Ionosphere: Wave/Particle Interactions

Scientific paper

High resolution HF radar observations of ULF waves in the ionosphere are possible by artificially generating irregularities using the EISCAT heater at Tromsø, Norway. The line-of-sight velocities from the CUTLASS radars have been combined for the first time to form bistatic flow vectors during a ULF wave, generating ionospheric electric field measurements with a higher accuracy than ever previously recorded by any instrument. A high-m wave observed in the ionosphere exhibits a frequency which is a harmonic of that of a low-m field line resonance which is observed simultaneously in the ionosphere and at the ground. The high-m pulsation resembles a class of particle driven wave previously recorded on VHF radars. These results are consistent with recent HF radar observations of small scale waves possessing similar characteristics to field line resonances and with the theory that the low-m wave may be driving the high-m wave through a non-linear Kelvin-Helmholtz instability.

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