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Online computation of International Reference Ionosphere extended to Plasmasphere(IRI-Plas) model for space weather

Geodesy and Geodynamics 2018年第5期9卷 347-357页

作者： Umut Sezen T.L.Gulyaeva Feza Arikan Department of electrical and electronics engineering Hacettepe University IZMIRAN

Ionosphere is the most challenging part of Space Weather with its spatio-temporal variability and dispersive nature. Ionospheric models are very important in reducing positioning error in GNSS *** Reference Ionosphere(IRI) is an empirical, deterministic and climatic model of ionosphere up to 2000 km in height. Recently, IRI extended to Plasmasphere(IRI-Plas) model has been developed to extend the interest region of IRI to the GPS orbital height of 20,000 km. Both IRI and IRI-Plas provide ionospheric parameters such as electron density, electron and ion temperatures according to their height profiles. In order to update the model to current ionospheric conditions, IRI-Plas can input F2 layer critical frequency(foF2), maximum ionization height(hmF2), and also Total electron Content(TeC).Online IRI-Plas is developed for the ionospheric community to run multiple tasks at various locations,dates and times with optional foF2, hmF2 and TeC inputs in a user-friendly manner. In this paper, we are going to present the capabilities of the Online IRI-Plas service and provide some comparisons between IRI-Plas outputs and ionosonde measurements. The comparison between online IRI-Plas foF2 outputs and ionosonde foF2 measurements indicates that the model with TeC input can significantly improve the representation of the current ionospheric state, which is very successful especially in the geomagnetically disturbed days.

关键词： Ionosphere Space weather IRI-Plas GPS TeC IONOLAB

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NVIS HF signal propagation in ionosphere using calculus of variations

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Geodesy and Geodynamics 2019年第1期10卷 72-76页

作者： Umut Sezen Feza Arikan Orhan Arikan Department of electrical and electronics engineering Hacettepe University Department of electrical and electronics engineering Bilkent University

Modeling Near Vertical Incidence Sounding(NVIS) High Frequency(HF) signal propagation in the ionosphere is important. Because, ionosondes which are special types of radars probing the ionosphere with certain HF frequencies(between 2 and 30 MHz), work mostly in NVIS mode(where elevation angle is between 89 and 90°). In this work, we are going to propose a new method for NVIS wave propagation in the ionosphere by discretizing the NVIS wave propagation path into mediums in which the refractive index changes linearly, where we solve the ray propagation in each medium analytically using calculus of variations and use Snell's Law at medium changes. The main advantage of the proposed solution is the reduced computational complexity and time. This algorithm can be used to simulate and compare the behavior of vertical ionosondes together with other ray tracing algorithms.

关键词： Ionosphere HF propagation Calculus of variations

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