Physics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2879b&link_type=abstract
Journal of Geophysical Research, vol. 82, July 1, 1977, p. 2879-2886.
Physics
Azimuth, Earth Magnetosphere, Magnetohydrodynamic Waves, Polarization Characteristics, Antarctic Regions, Ground Stations, Plasma Density, Power Spectra, Signal Analysis
Scientific paper
A comparison has been made of magnetospheric ULF signals measured at Sanae and Siple, two Antarctic stations near L = 4, in order to examine the longitudinal scale size of magnetospheric signals in the frequency range of about 10 to 50 mHz. Data comparisons were made on 2 days during which substantial ULF wave activity existed in this band. The wave signals were often not correlated at the two stations, an indication of an azimuthal scale length of five hours or less (phase numbers greater than 6) for these frequencies. One-to-one relationships between the stations could be identified at times for irregular nighttime waves of frequencies about 10-17 mHz. Wave polarization reversals were observed around local noon at Siple; no reversals were seen at Sanae. This suggests that changes in the wave resonance region (and thus the magnetospheric plasma density gradients) occurred within the 5-hour interval between local noon at the two stations.
Barker Marion D.
Lanzerotti Louis J.
Robbins M. F.
Webb Douglas C.
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