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Authors: Settimi, A.*
Pietrella, M.*
Pezzopane, M.*
Bianchi, C.*
Title: The IONORT-ISP-WC system: inclusion of an electron collision frequency model for the D-layer
Title of journal: Advances in space research
Series/Report no.: 8/55 (2014)
Publisher: Elsevier Science Limited
Issue Date: 15-Apr-2015
DOI: 10.1016/j.asr.2014.07.040
Keywords: Ray-Tracing
Electron Density
Assimilative Modelling
Oblique Ionogram
Electron collision frequency model
Abstract: The IONORT-ISP system (IONOspheric Ray-Tracing – IRI-SIRMUP-PROFILES) was recently developed and tested by comparing the measured oblique ionograms over the radio link between Rome (41.89ºN, 12.48ºE), Italy, and Chania (35.51ºN, 24.02ºE), Greece, with the IONORT-ISP simulated oblique ionograms (Settimi et al., 2013). The present paper describes an upgrade of the system to include: a) electron-neutral collision have been included by using a collision frequency model that consists of a double exponential profile; b) the ISP three dimensional (3-D) model of electron density profile grid has been extended down to the altitude of the D-layer; c) the resolution in latitude and longitude of the ISP 3-D model of electron density profile grid has been increased from 2°x2° to 1°x1°. Based on these updates, a new software tool called IONORT-ISP-WC (WC means with collisions) was developed, and a database of 33 IONORT-ISP-WC synthesized oblique ionograms calculated for single (1-hop paths) and multiple (3-hop paths) ionospheric reflections. The IONORT-ISP-WC simulated oblique ionograms were compared with the IONORT-IRI-WC synthesized oblique ionograms, generated by applying IONORT in conjunction with the International Reference Ionosphere (IRI) 3-D electron density grid, and the observed oblique ionograms over the aforementioned radio link. The results obtained show that (1) during daytime, for the lower ionospheric layers, the traces of the synthesized ionograms are cut away at low frequencies because of HF absorption; (2) during night-time, for the higher ionospheric layers, the traces of the simulated ionograms at low frequencies are not cut off (very little HF absorption); (3) the IONORT-ISP-WC MUF values are more accurate than the IONORT-IRI-WC MUF values.
Description: SPECIAL ISSUE: International Reference Ionosphere (IRI) and Global Navigation Satellite Systems (GNSS)
Appears in Collections:01.02.99. General or miscellaneous
01.02.05. Wave propagation
01.02.04. Plasma Physics
05.01.99. General or miscellaneous
05.01.05. Algorithms and implementation
Papers Published / Papers in press

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Settimi et al., Adv. Space Res. (2015).docMain Article (doc)118.5 kBMicrosoft Wordonly authorized users View/Open
ASR-D-14-00169R2.pdfMain Article (pdf)631.67 kBAdobe PDFView/Open

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