Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50...83h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, Feb. 1988, p. 83-92.
Physics
3
Coherent Electromagnetic Radiation, Extremely Low Frequencies, Polar Caps, Solar Terrestrial Interactions, Spatial Distribution, Geomagnetic Latitude, Polarization Characteristics, Solar Flares, Sudden Storm Commencements
Scientific paper
The spatial coherence of the first two Schumann resonant modes has been studied at two locations in the polar cap separated by 1100 km. Measurements were made at Assistance Bay and Mould Bay, which have geomagnetic latitudes of 83 and 79 deg, respectively, and satellite time-keeping was employed to accurately synchronize the field stations. The coherence was found to be high, typically 95 percent for the first Schumann mode, and was unaffected by changes in Kp, a storm sudden commencement, or a solar flare event. Polarization rotations were observed between the two stations, which could most likely be attributed to the coastline effect. The results are consistent with a stable propagation of Schumann activity from midlatitudes to high latitudes that is relatively unaffected by changes in the polar cap ionosphere.
Holtham P. M.
McAskill B. J.
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