A study of aspect angle effects in the E-region irregularity velocity using multi-point electric field measurements

Physics

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Ionosphere: Ionospheric Irregularities, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Electric Fields (2712), Ionosphere: Wave/Particle Interactions (7867)

Scientific paper

E-region irregularity velocity measured by the STARE Norway VHF radar is considered as a function of magnetic aspect angle α and EISCAT-derived electron drift velocity at 7 locations with α between 0.38° and 2.64°. It is shown that the irregularity line-of-sight (l-o-s) velocity normalized to the electron velocity component Ve0 comp exhibits a decrease with an increasing aspect angle for Ve0 comp exceeding 500 m/s. The rate of velocity decrease is greater than those reported previously and is close to that predicted by the linear theory of electrojet irregularities without assuming anomalously large collision frequencies.

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