Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3353a&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 22, p. 3353-3356
Physics
19
Ionosphere: Auroral Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Instruments And Techniques, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers
Scientific paper
The SuperDARN radars are proving to be a very powerful experimental tool for exploring solar wind-magnetosphere-ionosphere interactions. They measure the autocorrelation function (ACF) of the transmitted signal backscattered from the ionospheric irregularities, and derive parameters such as the Doppler velocity and the spectral width. The associated spectra have a specific behavior inside the cusp, a strong temporal and spatial evolution of the velocity and spectral width, and a high value of the spectral width. Although no studies have explained these characteristics, they are routinely used to detect the cusp in the radar data and estimate the open/closed field line boundary. Both satellite and magnetometer data show in the same region broadband wave activity in the Pc1, Pc2 frequency band. In this study, we evaluate how such wave activity modifies the radar's ACF, and conclude that it explains the spectra seen in the cusp.
Andre Régis
Pinnock Michael
Rodger Alan S.
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