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Ann. Geophys., 18, 1145-1153, 2000
www.ann-geophys.net/18/1145/2000/
© European Geosciences Union 2000
Ion-neutral coupling in the high-latitude F-layer from incoherent scatter and Fabry-Perot interferometer measurements
K. Cierpka, M. J. Kosch, M. Rietveld, K. Schlegel, and T. Hagfors
Max-Planck-Institut Aeronomie, 37191 Katlenburg-Lindau, Germany
Abstract. Since the auroral ionosphere provides an
important energy sink for the magnetosphere, ionosphere-thermosphere coupling
must be investigated when considering the energy budget of the
ionosphere-magnetosphere coupling. We present the first Scandinavian
ground-based study of high-latitude F-region ion-neutral frictional heating
where ion velocity and temperature are measured by the EISCAT incoherent scatter
radar as well as neutral wind and temperature being measured simultaneously by a
Fabry-Perot interferometer. A geomagnetically active period (Kp
= 7– – 5–) and quiet period (Kp = 0+
– 0) were studied. Neglecting the neutral wind can result in errors of
frictional heating estimates of 60% or more in the F-layer. About 96% of the
local ion temperature enhancement over the neutral temperature is accounted for
by ion-neutral frictional heating.
Key words: Ionosphere (auroral ionosphere;
ionosphere-atmosphere interactions)
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