Results 31 to 40 of about 2,463,485 (172)

Modeling of Topside Ionospheric Vertical Scale Height Based on Ionospheric Radio Occultation Measurements [PDF]

Journal of Geophysical Research: Space Physics, 2019
AbstractAn artificial neural network (ANN) method for the modeling of global topside ionospheric vertical scale height (VSH) using electron density profiles retrieved from Global Navigation Satellite Systems radio occultation (RO) data is proposed in this study.
Andong Hu, Brett Carter, Julie Currie, Robert Norman, Suqin Wu, Xiaoming Wang, Kefei Zhang   +6 more
openaire   +1 more source

Challenges in Specifying and Predicting Space Weather

Space Weather, 2021
Physics‐based Data Assimilation (DA) has been shown to be a powerful technique for specifying and predicting space weather. However, it is also known that different data assimilation models simulating the same geophysical event can display different ...
R. W. Schunk, L. Scherliess, V. Eccles, L. C. Gardner, J. J. Sojka, L. Zhu, X. Pi, A. J. Mannucci, A. Komjathy, C. Wang, G. Rosen   +10 more
doaj   +1 more source

Modeling the topside ionosphere by means of electron density values as recorded by the Swarm constellation [PDF]

, 2017
The topside part of the ionosphere lies above the ionospheric F2 layer peak and extends up to the plasmasphere. Since it contains a considerable part of the ionospheric plasma, its modeling is important for telecommunication’s purposes.
Rolando Rizzi, Alessio Pignalberi, Michael Pezzopane   +2 more
core   +1 more source

Plasma transport in the topside venus ionosphere [PDF]

, 1977
We have studied the extent to which certain transport processes affect ion composition and heat flow in the daytime, topside Venus ionosphere. Particular attention is given to the conditions that prevailed during the Mariner 5 measurements, at which time
St. -Maurice, J. -P., Schunk, Robert W.
core   +1 more source

A‐CHAIM: Near‐Real‐Time Data Assimilation of the High Latitude Ionosphere With a Particle Filter

Space Weather, 2023
The Assimilative Canadian High Arctic Ionospheric Model (A‐CHAIM) is an operational ionospheric data assimilation model that provides a 3D representation of the high latitude ionosphere in Near‐Real‐Time (NRT).
Ben Reid, David R. Themens, Anthony McCaffrey, P. T. Jayachandran, Magnar G. Johnsen, Thomas Ulich   +5 more
doaj   +1 more source

Modeling the presunrise plasma heating in the low‐ to midlatitude topside ionospheres [PDF]

Journal of Geophysical Research: Space Physics, 2010
Global distributions of presunrise ion heating were discovered by the Ionospheric Plasma and Electrodynamics Instrument onboard the ROCSAT‐1 satellite in the low‐ to midlatitude topside ionosphere. The most significant presunrise ion heating was clearly found in the 0400–0500 LT sector and asymmetrically located in the South Pacific and North Atlantic ...
C. K. Chao, S.‐Y. Su, J. D. Huba, K.‐I. Oyama   +3 more
openaire   +1 more source

Analyses of different propagation models for the estimation of the topside ionosphere and plasmasphere with an Ensemble Kalman Filter [PDF]

Annales Geophysicae, 2020
Abstract. The accuracy and availability of satellite-based applications like GNSS positioning and remote sensing crucially depends on the knowledge of the ionospheric electron density distribution. The tomography of the ionosphere is one of the major tools to provide link specific ionospheric corrections as well as to study and monitor physical ...
Tatjana Gerzen, David Minkwitz, Michael Schmidt, Eren Erdogan   +3 more
openaire   +3 more sources

Comparisons of Differential Code Bias (DCB) Estimates and Low-Earth-Orbit (LEO)-Topside Ionosphere Extraction Based on Two Different Topside Ionosphere Processing Methods

Remote Sensing
Global navigation satellite system (GNSS) differential code bias (DCB) and topside ionosphere vertical electron content (VEC) can be estimated using onboard data from low-earth-orbit (LEO) satellites. These satellites provide the potential to make up for
Mingming Liu, Yunbin Yuan, Jikun Ou, Bingfeng Tan   +3 more
doaj   +1 more source

Validation of NeQuick2 topside TEC using ESA Swarm GNSS data

Ain Shams Engineering Journal
Accurate topside ionosphere–plasmasphere modeling is vital for GNSS. Using Swarm GNSS data, topside TEC is derived to evaluate NeQuick2 from ∼460–20,200 km across solar activity, season, latitude, local time, and hemispheres.
Muhammad Mubasshir Shaikh
doaj   +1 more source

The Impacts of Tropospheric Gravity Wave‐Generated MSTIDs on Skywaves at Mid‐latitude North American Sector Observed and Modeled Using SuperDARN HF Radars

Radio Science, Volume 61, Issue 9, September 2026.
Abstract Trans‐ionospheric high frequency (HF: 3–30 MHz) response to atmospheric gravity waves (GWs) is studied in the middle‐latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW‐generated medium‐scale traveling ionospheric disturbances (MSTID ...
S. Chakraborty, P. A. Inchin, S. Debchoudhury, B. Bergsson, M. Zettergren, J. M. Ruohoniemi   +5 more
wiley   +1 more source