Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1463g&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Nov. 1984, p. 1463-1466. Research supported by the Deutsche Forschungsgem
Physics
34
Damping, Geomagnetic Pulsations, Ionospheric Heating, Polar Regions, Ionospheric Conductivity, Magnetic Signatures, Scandinavia
Scientific paper
Ground magnetic observations of the highly damped ULF pulsation event of January 9, 1979 are analyzed. The pulsation period of the event shows a clear variation with latitude suggesting decoupled oscillations of individual magnetic field shells. The pulsation amplitudes exhibit an-e-fold decay with the damping rate gamma which varies both in longitudinal and latitudinal directions. When Joule heating is assumed in the ionosphere as the dominant damping mechanism, approximated height-integrated Pedersen profiles can be calculated which fit well with previously observed values. This is considered to be observational proof that ionospheric Joule dissipation is the major damping mechanism for high-latitude ULF pulsations.
Baumjohann Wolfgang
Glassmeier Karl-Heintz
Volpers H.
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