Other
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phrvl..47.1343r&link_type=abstract
Physical Review Letters, vol. 47, Nov. 2, 1981, p. 1343-1346. Research supported by the University of Maryland
Other
9
Earth Magnetosphere, Ionospheric Conductivity, Magnetohydrodynamic Waves, Solar Flares, Solar Terrestrial Interactions, Wave Excitation, Cosmic Plasma, Geomagnetic Pulsations, Geomagnetism, Solar Activity Effects, Solar Radiation, Solar X-Rays, Space Plasmas, Ultraviolet Radiation
Scientific paper
Observations are reported of magnetospheric hydromagnetic (Alfven) waves, excited by rapid changes in ionospheric conductivity induced by solar flare X-ray and extreme-ultraviolet fluxes. The observed wave frequencies (about 0.01-0.02 Hz) are those expected for fundamental eigenoscillations of the geomagnetic field at middle latitudes. The measurements confirm a natural hydromagnetic wave generation mechanism not associated with the solar wind or geomagnetic storms. These results have implications for Alfven wave generation in other cosmic plasmas.
Lanzerotti Louis J.
Morris P. B.
Rosenberg T. J.
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