Absorption of cosmic noise in the E-region during electron heating events - A new class of riometer absorption events

Physics

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Cosmic Noise, E Region, Electromagnetic Absorption, Ionospheric Heating, Electron Energy, Incoherent Scatter Radar, Ion Temperature, Ionospheric Electron Density, Particle Collisions, Riometers

Scientific paper

The incoherent scatter radar facility (ISR) recently installed at Sondre Stromfjord, Greenland (inv. lat. = 74 deg) has been used to investigate events of substantially elevated E-region temperatures related to the occurrence of strong horizontal electric fields. It has been found that a peculiar type of weak, slowly fluctuating cosmic noise absorption commonly observed in the daytime on riometers in the polar region could be caused by non-derivative collisional absorption resulting from the strongly enhanced electron-neutral collision frequencies in the heated E-region.

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