Abstract
The ionospheric D-region affects propagation of electromagnetic waves including ground-based signals and satellite signals during its intensive disturbances. Consequently, the modeling of electromagnetic propagation in the D-region is important in many technological domains. One of sources of uncertainty in the modeling of the disturbed D-region is the poor knowledge of its parameters in the quiet state at the considered location and time period. We present the Quiet Ionospheric D-Region (QIonDR) model based on data collected in the ionospheric D-region remote sensing by very low/low frequency (VLF/LF) signals and the Long-Wave Propagation Capability (LWPC) numerical model. The QIonDR model provides both Wait’s parameters and the electron density in the D-region area of interest at a given daytime interval. The proposed model consists of two steps. In the first step, Wait’s parameters are modeled during the quiet midday periods as a function of the daily sunspot number, related to the long-term variations during solar cycle, and the seasonal parameter, providing the seasonal variations. In the second step, the output of the first step is used to model Wait’s parameters during the whole daytime. The proposed model is applied to VLF data acquired in Serbia and related to the DHO and ICV signals emitted in Germany and Italy, respectively. As a result, the proposed methodology provides a numerical tool to model the daytime Wait’s parameters over the middle and low latitudes and an analytical expression valid over a part of Europe for midday parameters.
Highlights
IntroductionThe ionosphere is the upper atmospheric layer that, due to its electrical properties, affects the propagation of electromagnetic waves [1,2]
We present the Quiet Ionospheric D-Region (QIonDR) model which provides a procedure for the determination of the D-region plasma parameters in quiet conditions using the very low/low frequency (VLF/LF) observational data for the considered area in mid- and low-latitude domains, and the considered time period
Wait’s parameters have the same distributions as the presented corresponding graphs because they have lower than those modeled by the Long-Wave Propagation Capability (LWPC) program for a constant value of modeled amplitude or phase in quiet conditions
Summary
The ionosphere is the upper atmospheric layer that, due to its electrical properties, affects the propagation of electromagnetic waves [1,2]. Research of ionospheric properties is a very complex task because of permanent influences coming from outer space and different terrestrial layers. For this reason, it is of crucial importance to include as many observational data as possible in their modeling. Equations (16) and (17) in Equation (12) gives the midday electron density from σ and χ at altitude h.
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