Mohamed O. Shammat;Bodo W. Reinisch;Ivan Galkin;Philip J. Erickson;Jay A. Weitzen;William C. Rideout
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Characterizing plasma peak density thickness in the ionosphere: A single-site multi-instrument study
This paper introduces the Peak Density Thickness (PDT) formalism, a novel approach to representing the F2 layer's vertical electron density profile in the ionosphere. It diverges from the conventional “pointed-peak” model by suggesting a “broad-peak” or “flat-nose” profile where plasma density remains constant within an altitude interval χ. This theory is backed by independent observations, including a comprehensive data set from the Millstone Hill Incoherent Scatter Radar at the MIT Haystack observatory, spanning from 1993 to 2023, which illustrates the presence and diurnal variation of PDT. A single-day intensive cross-verification using Digisonde Portable Sounder DPS4D soundings of the sub-peak ionosphere has shown remarkable agreement in the measurements of the lower boundary of the χ interval and the peak density. This study suggests incorporating the flat-nose section χ into the F-region profile formalism. Such a shift could improve the accuracy of topside specifications derived from ground-based ionosonde measurements, enhancing our understanding of ionospheric plasma dynamics.
期刊介绍:
Radio Science (RDS) publishes original scientific contributions on radio-frequency electromagnetic-propagation and its applications. Contributions covering measurement, modelling, prediction and forecasting techniques pertinent to fields and waves - including antennas, signals and systems, the terrestrial and space environment and radio propagation problems in radio astronomy - are welcome. Contributions may address propagation through, interaction with, and remote sensing of structures, geophysical media, plasmas, and materials, as well as the application of radio frequency electromagnetic techniques to remote sensing of the Earth and other bodies in the solar system.