Effect of electric fields on the daytime high-latitude E and F regions

Details Effect of electric fields on the daytime high-latitude E and F regions Effect of electric fields on the daytime high-latitude E and F regions

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3121s&link_type=abstract

Journal of Geophysical Research, vol. 80, Aug. 1, 1975, p. 3121-3130.

Physics

38

E Region, Electric Field Strength, F Region, Ionospheric Ion Density, Atmospheric Models, Coulomb Collisions, Daytime, Electron Density Profiles, Ion Temperature, Momentum, Monatomic Gases, Nitric Oxide, Oxygen Ions, Steady State

Scientific paper

We have obtained solutions of the coupled continuity, momentum, and energy equations for NO(+), O(+), and O2(+) ions for conditions appropriate to the daytime high-latitude E and F regions. Owing to the rapid increase of the reaction O(+) + N2 yielding NO(+) + N with ion energy, high-latitude electric fields and consequent perpendicular-E x B drifts deplete O(+) in favor of NO(+). For electric field strengths less than about 10 mV/m the depletion of O(+) is small, and the altitude profiles of ion density are similar to those found at mid-latitudes. However, for moderate electric field strengths (50 mV/m), NO(+) is substantially increased in relation to O(+) and becomes an important ion throughout the F region. For large electric fields (200 mV/m), NO(+) completely dominates the ion composition to at least 600 km, decreasing at high altitudes with a diffusive equilibrium scale height. Since the overall F region electron density decreases markedly with increasing electric field strength, it appears that high-latitude, daytime electron density troughs are directly related to the presence of ionospheric electric fields.

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