Results 61 to 70 of about 705,367 (158)

Parameter Estimation of Ionospheric Echo Signals Using an Electromagnetic Vector Array

IEEE Access
With the use of the non-stationarity and waveform information of the ionospheric echo signals, an approach to the joint estimation of angles and polarization states is proposed by using an array of electromagnetic vector antennas.
Shujuan Ding, Jie Wang, Jinzhi Bi, Na Wei, Rongqiu Zheng, Junbo Yang   +5 more
doaj   +1 more source

Influence of the hypermagnetic field noise on the baryon asymmetry generation in the symmetric phase of the early universe

European Physical Journal C: Particles and Fields, 2021
We study a matter turbulence caused by strong random hypermagnetic fields (HMFs) that influence the baryon asymmetry evolution due to the Abelian anomalies in the symmetric phase in the early Universe.
Maxim Dvornikov, Victor B. Semikoz
doaj   +1 more source

Ionospheric Scintillation and Geomagnetic Disturbance Caused by Space Hurricanes

Space Weather, Volume 23, Issue 7, July 2025.
Abstract A space hurricane is a large‐scale, cyclone‐shaped aurora characterized by a rotating magnetic structure and shears in plasma convection, driven by high‐latitude magnetic reconnection. It typically forms near the magnetic poles in summertime, providing an efficient energy transport channel from the solar wind to the Earth's magnetosphere under
Sheng Lu, Zan‐Yang Xing, Qing‐He Zhang, Yong‐Liang Zhang, Hui‐Gen Yang, Kjellmar Oksavik, L. R. Lyons, Kazuo Shiokawa, Yong Wang, Yu‐Zhang Ma, Xiang‐Yu Wang, Tong Xu, Shu‐Ji Sun, Duan Zhang   +13 more
wiley   +1 more source

Web - based virtual laboratories for antenna arrays, radiowave propagation and filter design

, 2011
This tutorial explains in detail the creation of a Web-based application using the MATLAB Web Server (MWS) toolbox of MATLAB. It aims to enable readers who a re familiar with MATLAB but don't have Web-programming skills to prepare their own Web-based ...
Uluışık, Çağatay, Sevgi, Levent
core   +1 more source

Transhorizon radiowave propagation due to evaporation ducting: the effect of tropospheric weather conditions on VHF and UHF radio paths over the sea

, 2006
A detailed description of evaporation ducts and their relevance to radiowave propagation over the sea has been presented. The constantly changing weather conditions over the sea mean that marine and coastal environments, in particular, are prone to these
D. R. Siddle (7583009), S. D. Gunashekar (7585151), E. Michael Warrington (7583003)   +2 more
core   +4 more sources

A Regional 3‐D Data Assimilation Model for the Ionospheric Electron Density at Middle‐to‐High Latitudes in the Northern Hemisphere

Space Weather, Volume 23, Issue 5, May 2025.
Abstract In this paper, we developed an efficient regional three‐dimensional data assimilation model focused on the middle‐to‐high latitude ionosphere in the Northern Hemisphere. The model employed the Empirical Canadian High Arctic Ionospheric Model (E‐CHAIM) as the background, which was specifically optimized for high‐latitude applications and has ...
Ling‐Xin Zhao, Qing‐He Zhang, Xin‐An Yue, Jian‐Hui He, Yong Wang, Zan‐Yang Xing, Xu Zhou, Yu‐Zhang Ma, P. T. Jayachandran, Kjellmar Oksavik, Larry Lyons, Tong Xu, Shu‐Ji Sun   +12 more
wiley   +1 more source

Building information modelling conversion for radiowave propagation studies

, 2021
This paper presents a Building Information Modelling (BIM) data conversion algorithm for radio wave propagation studies in indoor and outdoor environments.
Caldeirinha, Rafael, Telmo Rui Fernandes, Fernandes, Telmo Rui, Rafael Caldeirinha, Rodrigues, Hugo, Joao Louro, Louro, João, Hugo Rodrigues   +7 more
core   +1 more source

How Do Space Hurricanes Disturb the Polar Thermosphere: A Statistical Survey

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract The space hurricane is a polar cap auroral structure with strong flow shears and intense particle precipitation that can disturb the thermosphere under quiet geomagnetic conditions. Here the statistical characteristics of this interaction are surveyed using data from the Defense Meteorological Satellite Program and Gravity Field and Steady ...
Zhi‐Feng Xiu, Yu‐Zhang Ma, Qing‐He Zhang, Zan‐Yang Xing, Larry Lyons, Kjellmar Oksavik, Yong‐Liang Zhang, Marc Hairston, Yong Wang, Duan Zhang, Sheng Lu   +10 more
wiley   +1 more source

A High-Precision Prediction Method of Atmospheric Absorption Attenuation on Over-the-Horizon Propagation Trajectories

Atmosphere
Abnormal refraction phenomena such as atmospheric ducts due to temperature inversions or rapid decreases in humidity often happen in the lower troposphere over the sea and coastal area, which can make low-elevation signals in the duct layer propagate ...
Qinglin Zhu, Hao An, Fang Sun, Jie Han, Xiang Dong, Shoubao Zhang, Changsheng Lu, Ying Ci, Bin Xu   +8 more
doaj   +1 more source

Geomagnetically Induced Currents, Transformer Harmonics, and Reactive Power Impacts of the Gannon Storm in May 2024

Space Weather, Volume 23, Issue 4, April 2025.
Abstract Geomagnetically induced current (GIC) measurements made at two 3 phase, 3 limb transformers, operating in the Halfway Bush substation in Dunedin, New Zealand have been analyzed during the May 2024 Gannon Storm. GIC measurements were combined with very low frequency radio wave AC harmonic measurements made nearby, and reactive power ...
M. A. Clilverd, C. J. Rodger, D. H. Mac Manus, J. B. Brundell, M. Dalzell, A. Renton, V. Lo, A. Lapthorn, A. W. Smith, J. Malone‐Leigh, X. Feng, T. Petersen   +11 more
wiley   +1 more source