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Published by: Geomagnetism and Aeronomy Published on: Jan-12-2007
YEAR: 2007   DOI: 10.1134/S0016793207060059
We investigate the variations in the thermosphere and ionosphere using multi-instrument observations during the April 2002 period, with a particular focus on periods during small geomagnetic disturbances. Large and long-lasting reductions in the daytime electron density were observed at midlatitudes by incoherent scatter radars, ionosondes, and GPS receivers. These reductions reached 30\textendash50\% and were observed over an extended longitudinal area. They propagated to middle latitudes (35\textendash40\textdegreeN) in ...
Published by: Journal of Geophysical Research Published on: 03/2006
YEAR: 2006   DOI: 10.1029/2004JA010683