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View article: Imaging ionosphere using single-frequency GNSS data onboard nanosatellite missions
Imaging ionosphere using single-frequency GNSS data onboard nanosatellite missions Open
The Earth’s ionosphere is of considerable importance for medium- and long-range high-frequency communication, positioning, and over-the-horizon radar systems. Positioning and communication applications require new capabilities to und…
View article: Assimilating Space‐Based Thermospheric Neutral Density (TND) Data Into the TIE‐GCM Coupled Model During Periods With Low and High Solar Activity
Assimilating Space‐Based Thermospheric Neutral Density (TND) Data Into the TIE‐GCM Coupled Model During Periods With Low and High Solar Activity Open
The global estimation of Thermospheric Neutral Density (TND) and electron density (Ne) on various altitudes are provided by upper atmosphere models, however, the quality of their forecasts needs to be improved. In this study, we present th…
View article: How can along-track accelerations be used to predict global and multi-level thermospheric neutral density?
How can along-track accelerations be used to predict global and multi-level thermospheric neutral density? Open
Estimating global and multi-level Thermosphere Neutral Density (TND) is important for studying coupling processes within the upper atmosphere, and for applications like orbit prediction. Available models fall short in predicting realistic …
View article: Assessing a calibration and data assimilation technique for predicting multi-level global thermospheric neutral density fields
Assessing a calibration and data assimilation technique for predicting multi-level global thermospheric neutral density fields Open
An accurate estimation of the Thermospheric Neutral Density (TND) is important for predicting the orbit of satellites and objects, for example, those with the altitude of less than 1000 km. Models are often used to simulate TNDs but their …
View article: How can space-borne along-track neutral density measurements be used to predict multi-level global thermospheric neutral density fields?
How can space-borne along-track neutral density measurements be used to predict multi-level global thermospheric neutral density fields? Open
<p>An accurate estimation of the Thermospheric Neutral Density (TND) is important for predicting the orbit of satellites and objects, for example, those with the altitude of less than 1000 km. Models are often used to simulate TNDs b…
View article: Assimilation frameworks for merging accelerometer derived thermospheric neutral mass density estimates with empirical and physical models
Assimilation frameworks for merging accelerometer derived thermospheric neutral mass density estimates with empirical and physical models Open
<p>Atmospheric drag has a direct relationship with the thermospheric neutral density (TND) and represents a considerable impact on the precise orbit determination (POD) and prediction of low Earth orbit (LEO) satellites, for example …
View article: A Calibration and Data Assimilation Approach to Use GRACE, GRACE-FO and Swarm Accelerometer Measurements for Forecasting Global and Multi-level Thermospheric Neutral Density Fields
A Calibration and Data Assimilation Approach to Use GRACE, GRACE-FO and Swarm Accelerometer Measurements for Forecasting Global and Multi-level Thermospheric Neutral Density Fields Open
<p>An accurate simulation global thermospheric neutral density (TND) on various altitudes is important for geodetic and space weather applications. In addition, this is essential for designing the low-Earth-orbit (LEO) missions, pred…
View article: The impact of severe storms on forecasting the Ionosphere-Thermosphere system through the assimilation of SWARM-derived neutral mass density into physics-based models
The impact of severe storms on forecasting the Ionosphere-Thermosphere system through the assimilation of SWARM-derived neutral mass density into physics-based models Open
<p>The response of the Ionosphere - Thermosphere (IT) system to severe storm conditions is of great importance to fully understand its coupling mechanisms. The challenge to represent the governing processes of the upper atmosphere de…
View article: A sequential calibration technique to improve IRI using TEC estimates of the GNSS network in Europe
A sequential calibration technique to improve IRI using TEC estimates of the GNSS network in Europe Open
<p>The development of space-geodetic observation techniques has brought out a wide range of applications such as positioning and navigation, where the Global Navigation Satellite System (GNSS) is the main tools to provide surveying m…
View article: How can Thermospheric Neutral Density (TND) estimates from CHAMP and GRACE accelerometer observations be used to improve empirical models?
How can Thermospheric Neutral Density (TND) estimates from CHAMP and GRACE accelerometer observations be used to improve empirical models? Open
<p>An accurate estimation of the Thermospheric Neutral Density (TND) is important to compute drag forces acting on Low-Earth-Orbit (LEO) satellites and debris. Empirical thermospheric models are often used to compute TNDs (along-trac…
View article: Improving Total Electron Content (TEC) Models for Geodetic Applications
Improving Total Electron Content (TEC) Models for Geodetic Applications Open
<p>Increasing the quality of ionosphere modeling is crucial and remains a challenge for many geodetic applications such as GNSS Precise Point Positioning (PPP) and navigation. Ionosphere models are the main tool to provide an estimat…