Evidence of meso-scale structure in the high-latitude thermosphere

Details Evidence of meso-scale structure in the high-latitude thermosphere Evidence of meso-scale structure in the high-latitude thermosphere

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001angeo..19...37a&link_type=abstract

Annales Geophysicae, vol. 19, Issue 1, pp.37-46

Physics

13

Scientific paper

There is a widely held assumption that the thermospheric neutral gas is slow to respond to magnetospheric forcing owing to its large inertia and therefore, may be treated as a steady state background medium for the more dynamic ionosphere. This is shown to be over simplistic. The data presented here compare direct measurements of the thermospheric neutral winds made in Northern Scandinavia by Fabry-Perot Interferometers (FPIs) with direct measurements of the ionosphere made by the EISCAT radar and with model simulations. These comparisons will show that the neutral atmosphere is capable of responding to ionospheric changes on mesoscale levels, i.e., spatial and temporal scale sizes of less than a few hundred kilometres and tens of minutes, respectively.

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