A comprehensive understanding of ionospheric irregularities is crucial for satellite communications and navigation systems. These are significantly shaped by various external factors, including solar activity, geomagnetic disturbances, impacts from the lower atmosphere. This study aims to underscore complex within thermosphere-ionosphere system while elucidating substantial role drivers, as evidenced observational data model simulations. We will analyze key parameters thermosphere...

Abstract Space weather events can disrupt satellite navigation, potentially compromising also the accuracy of real‐time flight tracking via Automatic Dependent Surveillance‐Broadcast (ADS‐B). This in turn could limit situational awareness pilots and reduce efficiency air traffic management. study shows these impacts space for selected tracks during 9 February 2024 solar flare compares ADS‐B reported data with flux total electron content measurements. Gaps position errors data, which...

The delayed ionospheric response is analyzed for two well-defined 27-day solar rotation periods in the year 2019 with radio flux index F10.7 and Global-scale Observations of Limb Disk (GOLD) data, like extreme ultraviolet (EUV) proxy, O/N2 column density ratio peak electron density, as well International Global Navigation Satellite System Service rapid high-rate total content (TEC) map data. Although correlation between GOLD EUV proxy TEC similar to TEC, it shown that estimated delays based...

Abstract. Physical and chemical processes in the ionosphere are driven by complex interactions with solar radiation. The ionospheric plasma is particular sensitive to EUV UV variations a time delay between one two days. This assumed be related thermospheric transport from lower F region. In previous analyses, has been investigated using F10.7 index. Here we present preliminary results of based on comprehensive reliable database consisting GNSS TEC Maps spectral flux data. We plan specify...

Abstract. We investigate the ionospheric response to solar Extreme Ultraviolet (EUV) variations using different proxies, based on EUV spectra observed from Solar Experiment (SEE) onboard Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite, F10.7 index (solar irradiance at 10.7 cm), Bremen composite Mg-II during January 2003 December 2016. The daily mean proxies are compared with global Total Electron Content (GTEC) values calculated IGS TEC maps. preliminary analysis...

Abstract To understand the global response of thermospheric‐ionospheric (TI) parameters to variations in solar irradiance measurements from Global‐Scale Observations Limb and Disk (GOLD) ultraviolet imaging spectrograph, radio flux F10.7, predictions Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model, International Global Navigation Satellite System Service total electron content maps (TEC) have been used. Various such as GOLD O / N 2 , nighttime peak density (Nmax)...

Abstract. Simulations of the ionospheric response to solar flux changes driven by 27 d rotation have been performed using global 3-D Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) physics-based numerical model. Using F10.7 index as a proxy for extreme ultraviolet (EUV) variations in model, delay at period is well reproduced and amounts about 1 d, which consistent with satellite situ measurements. From mechanistic CTIPe studies reduced increased eddy diffusion, we...

This study presents a new modeling approach that aims for long time predictions (more than 12 h) of ionospheric disturbances driven by solar storm events. The proposed model shall run in an operational framework to deliver fast and precise localized warnings these the future. wind data uses base historical impacts covering two cycles reconstruct future events resulting disturbances. basic components are presented discussed this study, strengths reconstruction based on showing good...

Based on the analysis of electron density Ne profiles (Grahamstown ionosonde), a case study height-dependent ionospheric response to two 27-day solar rotation periods in 2019 is performed. A well-defined sinusoidal observed for period from 27 April 24 May and reproduced with Thermosphere-Ionosphere-Electrodynamics General Circulation Model simulation. The occurring differences between model observations as well driving physical chemical processes are discussed based variations major species....

Abstract. This study correlates different ionospheric parameters with the integrated solar extreme ultraviolet radiation (EUV) to analyze delayed response, testing and improving upon previous studies on delay. Several time series of correlation coefficients delays are presented characterize trend delay from January 2011 December 2013. The impact diurnal variations in analysis at an hourly resolution for fixed locations discussed specified calculations timescales comparison geomagnetic...

Abstract The ionospheric response to solar 27‐day signatures has complex temporal and spatial variations, which are driven by short‐ long‐term changes of the activity among other processes (e.g., geomagnetic activity). A delay between these occurs due accumulation plasma, depends on rates photoionization, photodissociation recombination in upper atmosphere. balance significantly at different levels. Therefore present study investigates delayed during low high activity. For that purpose,...

Abstract. The ionospheric total electron content (TEC) provided by the International GNSS Service (IGS) and TEC simulated Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics (CTIPe) model have been used to investigate delayed response against solar flux its trend during years 2011 2013. analysis of distinct low-latitude midlatitude over 15∘ E shows a better correlation observed radio index F10.7 in Southern Hemisphere compared Northern Hemisphere. Thus, significant hemispheric...

The complex interactions in the upper atmosphere, which control height-dependent ionospheric response to 27-day solar rotation period, are investigated with superposed epoch analysis technique. signatures describing activity calculated from a proxy (F10.7) and wavelength-dependent extreme ultraviolet (EUV) fluxes (Thermosphere Ionosphere Mesosphere Energetics Dynamics/Solar EUV Experiment), corresponding conditions electron density profiles (Pruhonice ionosonde station) O2 (Global-scale...

Having a comprehensive understanding of the ionosphere's irregular behavior and its response to solar activity is crucial for satellite communication navigation applications. The sun's extreme ultraviolet (EUV) (UV) radiation are primary sources energy Earth's thermosphere ionosphere (TI). To understand global TI parameters (e.g., O/N2, peak electron density (Nmax)) changes in irradiance, various data have been used. These include Global-Scale Observations Limb Disk (GOLD) imaging...

The solar extreme ultraviolet (EUV) radiation drives the major ionization processes in upper atmosphere. Its variability causes a related response ionospheric observables. Especially of interest is delayed electron density (Ne), integrated total content (TEC), and neutral ionized species to 27-d rotation period. But this signature often influenced by underlying trends on shorter longer time-scales. Therefore, study examines superposed with long-term increase EUV, showing that complex...

Safe and efficient management of the constantly growing air traffic is an important task. For that reason, international civil aviation organization (ICAO) approved Automatic Dependent Surveillance (ADS) system used to share information (e.g. position, altitude speed) between aircraft control units. This improves situational awareness visibility but also environmental impact space capacity. Both applications ADS, Broadcast (B) Contract (C), rely on satellite-based communication navigation...

Abstract This study aims to examine the impact of lower atmospheric forcing on upper variability using Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model (TIEGCM). We conducted numerical experiments comparing induced due Hough Mode Extension (HME) tides constrained by winds and temperatures from Ionospheric Connection Explorer‐Michelson Interferometer for Global High‐Resolution Thermospheric Imaging (ICON‐MIGHTI) observations. Our model comparisons focus changes in composition...

In this study the Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM) is used to describe delayed ionospheric response solar Extreme Ultraviolet (EUV) radiation and its varying relation geomagnetic activity (e.g. stronger impact of wind during winter season in northern hemisphere). Long-term changes, at time scales longer than 27-day rotation cycle, are analyzed dependence delay on presented based calculations a chosen location mid-latitudes. Ionospheric delays 2, 11...

Abstract. The ionospheric Total Electron Content (TEC) provided by the International GNSS Service (IGS), and Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics (CTIPe) model simulated TEC have been used to investigate delayed response against solar flux its trend during years 2011 2013. analysis of distinct low mid-latitudes over 15° E shows a better correlation observed radio index F10.7 in Southern Hemisphere compared Northern Hemisphere. Thus, significant hemispheric asymmetry...

Abstract. This study correlates different ionospheric parameters with the integrated solar EUV radiation for an analysis of delayed response in order to confirm previous studies on delay and further specify variations delay. Several time series correlation coefficients delays are presented characterize trend from 2011 2013. The impact diurnal hourly resolution fixed locations discussed specified calculations scales comparison geomagnetic activity. An average TEC ≈ 18.7 hours...

The solar storm detection parameter, the effective pressure, which is based on a combination of wind velocity and southward component interplanetary magnetic field investigated with data covering two cycles to estimate an optimal configuration for its capabilities.The implementation optimized parameter able accurately identify onset time storms false alarm rate less than 2%, provides significantly better performance than, example, proton has significant lead geomagnetic indices.The pressure...

The thermosphere-ionosphere system changes significantly on various temporal scales due to the forcings from solar and geomagnetic processes, lower atmosphere. 27-day variation caused by rotation is one of most important modulating factors in ionosphere. A robust feature this context ionospheric lag about 1-2 days parameters such as total electron content (TEC) F2 layer peak density with respect variations at period. Here, TEC provided International GNSS Service (IGS) Coupled Thermosphere...