Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..609n&link_type=abstract
(EISCAT Scientific Association, International EISCAT Workshop, 4th, Sigtuna, Sweden, June 5-9, 1989) Journal of Atmospheric and
Physics
12
Gravity Waves, Ionospheric Disturbances, Sporadic E Layer, Tides, F Region, Field Aligned Currents, Ionospheric Electron Density, Particle Precipitation
Scientific paper
Observations made on July 10, 1987 with the EISCAT UHF radar are presented. The F-region measurements of both electron density and field-aligned ion velocity show that an upward propagating gravity wave with a period of about 1 h is present. The origin of the gravity wave is probably auroral. The E-region ion velocities show a tidal wave and both upward- and downward-propagating gravity waves. The gravity waves have three dominant periods with a possible harmonic relationship and similar vertical wavelengths. These waves are either reflected at a single reflection level, ducted between two levels, or they are generated in a nonlinear interaction between gravity and tidal waves.
Huuskonen Asko
Jalonen L.
Lanchester B. S.
Nygrén T.
Turunen Tauno
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