Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..313r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, Apr. 1982, p. 313-323.
Physics
7
D Region, Electron Density Profiles, Ionospheric Electron Density, Polar Cap Absorption, Radar Reflectors, Atmospheric Ionization, Atmospheric Stratification, High Frequencies, Ionospheric Propagation, Norway, Polar Regions, Radar Echoes, Riometers, Solar Protons
Scientific paper
The 2.75 MHz partial-reflection radar at Ramfjordmoen near Tromso has been used for a study of D-region electron densities by the differential-absorption method on a number of days during 1978-79. Received signals are generally stratified in several layers, typically over 60-80 km. Strong stable echoes are seen down to 55 km during periods of enhanced riometer absorption. Inferred electron densities vary between about 100-1000 per cu cm at about 60-80 km and show well-defined features which persist for about 10-20 min. During periods of high absorption, enhanced electron densities about 600 cm per cu cm are observed below 65 km. During a polar cap absorption event, the inferred electron densities at 60-70 km show a very stable profile. Possible sources of D-region ionization at high latitudes are briefly discussed.
Brekke Asgeir
Hansen Terese
Holt O.
Rastogi Pramod K.
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