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- W2088934064 endingPage "1195" @default.
- W2088934064 startingPage "1173" @default.
- W2088934064 abstract "The middle and upper atmosphere and the ionosphere at high latitudes are studied with the EISCAT incoherent scatter radars in northern Scandinavia. We describe here the investigations of the lower thermosphere and the E-region, and the mesosphere and the D-region. In the auroral zone both these altitude regions are influenced by magnetospheric processes, such as charged particle precipitation and electric fields, which are measured with the incoherent scatter technique. Electron density, neutral density, temperature and composition are determined from the EISCAT data. By measuring the ion drifts, electric fields, mean winds, tides and gravity waves are deduced. Sporadic E-layers and their relation to gravity waves, electric fields and sudden sodium layers are also investigated with EISCAT. In the mesosphere coherent scatter occurs from unique ionization irregularities. This scatter causes the polar mesosphere summer echoes (PMSE), which are examined in detail with the EISCAT radars. We describe the dynamics of the PMSE, as well as the combination with aeronomical processes, which could give rise to the irregularities. We finally outline the future direction which is to construct the EISCAT Svalbard Radar for studying the ionosphere and the upper, middle and lower atmosphere in the polar cap region." @default.
- W2088934064 created "2016-06-24" @default.
- W2088934064 creator A5080502218 @default.
- W2088934064 date "1994-07-01" @default.
- W2088934064 modified "2023-09-27" @default.
- W2088934064 title "Middle atmosphere and lower thermosphere processes at high latitudes studied with the EISCAT radars" @default.
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