Results 101 to 110 of about 34,527 (227)
Sky and ground - wave high frequency (HF) radars: challenges in modelling, simulation and application preface [PDF]
, 2010 Radar systems operating at high frequency (HF) are able to exploit a variety of propagation mechanisms to achieve line-of-sight (LOS) illumination as well as over-the-horizon coverage, thereby providing many opportunities for long range, wide area multi ...
Sevgi, Levent
core
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Poleward boundary intensifications (PBIs) are one of the most common auroral disturbances and have been shown to play a key role in substorm dynamics. PBIs are commonly interpreted as the ionospheric signature of magnetotail reconnection, providing insight into X‐line evolution.
Katherine Davidson +5 more
wiley +1 more source
Investigations of the lower and middle atmosphere at the Arecibo Observatory and a description of the new VHF radar project [PDF]
, 1986 The atmospheric science research at the Arecibo Observatory is performed by means of (active) radar methods and (passive) optical methods. The active methods utilize the 430 NHz radar, the S-band radar on 2380 MHz, and a recently constructed Very High ...
Hagen, J. +3 more
core +1 more source
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract The threefold daytime electron density increases, along with strong poleward meridional winds exceeding 200 m/s were captured by Sanya Incoherent Scatter Radar (SYISR) during the geomagnetic storm of 12 November 2025. The great ionospheric enhancements were extending to mid‐latitudes over 40° observed by total electron content (TEC) from ...
Qi Jiang +7 more
wiley +1 more source
Improving Coastal Circulation Using HF‐Radar Surface Currents
Earth and Space ScienceIn an attempt to improve the model‐derived coastal circulation around India, we explore three different frameworks to assimilate surface currents from HF‐Radars into an ocean model for the Indian Ocean.
Vinod Daiya +4 more
doaj +1 more source
Remote SensingThe validation of HF radar systems remains an area with significant scope for advancement, particularly in terms of linking data quality with system operational parameters, fully utilizing the potential of redundant data (e.g., overlapping radial ...
Bartolomeo Doronzo +4 more
doaj +1 more source
Space-time Characteristics and Experimental Analysis of Broadening First-order Sea Clutter in HF Hybrid Sky-surface Wave Radar [PDF]
, 2014 In high frequency (HF) hybrid sky-surface wave radar, the first-order sea clutter broadening is very complex and serious under the influence of ionosphere and bistatic angle, which affects the detection of ship target.
Chu, T.Q. +4 more
core +1 more source
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract Narrow bipolar events (NBEs) are often generated in overshooting thunderclouds (OT) penetrating the stratosphere. However, how and under what conditions OT produces such discharges remains unclear. With 3‐year lightning observations and simultaneous cloud top brightness temperature measurements over South China, we developed a more accurate OT
Baojun Wu +7 more
wiley +1 more source
The relationship between strength of turbulence and backscattering radar power at HF and VHF [PDF]
, 1983 The formulae relating turbulence and other atmospheric parameters to backscattered power for radar observations are reviewed. Emphasis is on the case of scatter from turbulent irregularities which have scales corresponding to the range of isotropic ...
Hocking, W. K.
core +1 more source
Application of HF Radar in Hazard Management
International Journal of Antennas and Propagation, 2016 A review is given of the impact that HF radars are having on the management of coastal hazards. Maps of surface currents can be produced every 10–20 minutes which, in real time, improve navigation safety in restricted areas commonly found near ports and ...
Mal Heron +6 more
doaj +1 more source