Other
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.7482l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Sept. 1, 1984, p. 7482-7486.
Other
7
F Region, Ionospheric Currents, Ionospheric Electron Density, Ohmic Dissipation, Polar Regions, Electron Scattering, Ion Scattering, Thermal Instability
Scientific paper
When the quasi-dc electric field exceeds about 25 mV/m in the ionosphere, a thermal instability that is caused by the Ohmic dissipation of Pedersen current in the electron gas can produce ionospheric irregularities in the F region within a few minutes. The threshold fields and scale lengths of the instability are determined by the electron energy loss due to electron-ion collisions, through which, as an intermediate step, energy is transferred from electrons to neutrals as energy sinks. The excited ionospheric irregularities have two scale length regimes: one is from tens of meters up to hundreds of meters, and the other one is from hundreds of meters up to a few tens of kilometers. This thermal instability is effective in generating high-latitude ionospheric irregularities, especially in the polar cap, where large quasi-dc electric fields have been observed even during quiet ionospheric conditions.
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