Recent results in auroral-zone scintillation studies

Physics

Scientific paper

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Auroral Zones, Ionospheric Propagation, Radio Signals, Scintillation, E Region, F Region, Ionospheric Conductivity, Night Sky, Spacecraft Communication, Ultrahigh Frequencies, Very High Frequencies

Scientific paper

Observational data are reviewed that pertain to a prominent nighttime enhancement of auroral-zone scintillation in VHF and UHF satellite signals at the point where the propagation vector lies within the plane of the local L shell. Experimental results that have been used to define the source region are examined, along with theories advanced to explain the occurrence and structure of the F-region irregularity responsible for the enhancement. It is concluded that soft-particle precipitation, convective plasma instabilities, E-layer conductivity, and the high-latitude current-convection pattern play important roles in controlling the detailed morphology of high-latitude F-region irregularities.

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