Aeronomy With the new HF Ionospheric Modification Facility at Arecibo

Details Aeronomy With the new HF Ionospheric Modification Facility at Arecibo Aeronomy With the new HF Ionospheric Modification Facility at Arecibo

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa42a..05d&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA42A-05

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0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 2403 Active Experiments, 2467 Plasma Temperature And Density

Scientific paper

The advent of the new Arecibo high-frequency (HF) modification facility opens up new opportunities for users to perform controlled aeronomy experiments at Arecibo Observatory. In this presentation, three such applications are described. These include studies of electron/ion energy balance and O-O+ charge exchange in the upper ionosphere/topside ionosphere, electron beam experiments that offer tests of energy loss processes, energy transport, and inelastic collision cross sections below about 250 km, and electron thermal balance in sporadic E, which yields information about collisional cross sections and/or background neutral density between approximately 110 km and 130 km. These experiments are conducted in the nighttime midlatitude ionosphere above Arecibo where there is no absorption of the HF en route to the E region and F region ionospheres, optical and radar diagnostics are available, and a smooth stratified F region profile persists. The HF investigations are referred to as controlled experiments because they yield reproducible results from one HF transmission to the next. Particular emphasis is placed on the controlled injection of suprathermal electrons because it allows electron thermal balance to be studied in greater detail in the F region than is achievable with daytime photoelectrons. Finally, we note that the incoherent scatter radar capability at Arecibo has improved greatly since the loss of the Arecibo HF facility in 1998 and that many new optical diagnostics are now available at the Observatory.

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