HF-driven currents in the polar ionosphere

Details HF-driven currents in the polar ionosphere HF-driven currents in the polar ionosphere

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3812103p&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 12, CiteID L12103

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Ionosphere: Active Experiments, Ionosphere: Current Systems (2721), Ionosphere: Ionospheric Dynamics, Ionosphere: Modeling And Forecasting, Ionosphere: Polar Cap Ionosphere

Scientific paper

Polar ionospheric heaters have generated ULF/ELF/VLF waves by modulating the auroral electrojet at D/E region altitudes. We present theoretical/computational results indicating that modulated F-region HF heating can generate ionospheric currents even in the absence of electrojet currents. The ELF currents are driven in a two-step process. First, the pressure gradient associated with F-region electron heating drives a local diamagnetic current. This acts as an antenna to inject Magneto-Sonic (MS) waves in the ionospheric plasma. Second, the electric field of the magneto-sonic wave drives Hall currents when it reaches the E region of the ionosphere. The Hall currents act as a secondary antenna that injects waves in the Earth-Ionosphere Waveguide below and Shear Alfven waves upwards to the conjugate regions. The paper examines the scaling and limitations of the concept and suggests proof-of-principle experiments using the HAARP ionospheric heater.

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