Results 41 to 50 of about 65,382 (157)

Currents in the Martian Ionosphere: Cases Without Strong Crustal Magnetic Fields

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract The Martian ionosphere hosts complex current systems driven both by solar wind interactions and neutral wind dynamo processes. While the global patterns of these current systems have been statistically examined, their detailed structures and orientations remain poorly constrained.
JunFeng Qin, Shannon Curry, Wenyi Sun, Matthew Fillingim, Robert Lillis, Yingjuan Ma, Yaxue Dong, Robin Ramstad, Shaosui Xu, Dave Mitchell   +9 more
wiley   +1 more source

Research on Polarization Cancellation of Nonstationary Ionosphere Clutter in HF Radar System [PDF]

International Journal of Antennas and Propagation, 2015
Oblique projection polarization filter (OPPF) can be applied as an effective approach for interference cancellation in high-frequency surface wave radar (HFSWR) and other systems. In order to suppress the nonstationary ionosphere clutter further, a novel OPPF based clutter suppressing scheme is proposed in this paper. The polarization and nonstationary
Xingpeng Mao, Hong Hong, Weibo Deng, Yongtan Liu   +3 more
openaire   +2 more sources

Bed Topography and Subglacial Conditions of Denman Glacier, East Antarctica: Insights From Magnetotelluric Data and Interdisciplinary Studies

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 7, July 2026.
Abstract Understanding the basal conditions of East Antarctica's outlet glaciers is critical for accurately modeling future ice‐sheet evolution. Denman Glacier, one of the continent's fastest‐flowing glaciers, has been identified in bed‐topography models as occupying the deepest continental trough on Earth, potentially acting as a major outlet of the ...
Maria Constanza Manassero, Kate Selway, Tobias Stål, Matthias Scheiter, Mareen Loesing, Felicity McCormack, Jacqueline A. Halpin, Bernd Kulessa, Anya M. Reading   +8 more
wiley   +1 more source

The Turbulence Properties of 150‐km Echoes in the Lower Ionosphere

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract The valley region ionosphere spans from approximately 120–200 km in altitude, and hosts a wide range of plasma, neutral, and solar interactions that create and maintain the ionosphere. In this region a ubiquitous and mysterious source of radar echoes called “150‐km echoes” has been observed since the 1960s.
William J. Longley, Lindsay V. Goodwin, Chirag R. Skolar, Nicholas M. Pedatella   +3 more
wiley   +1 more source

Deep Learning Aided Time–Frequency Analysis Filter Framework for Suppressing Ionosphere Clutter

Remote Sensing, 2022
In a heterogeneous environment, the ionosphere is dynamically changing in the Earth’s middle latitude, and backscatter from fast-moving irregularities in the plasma can cause ionosphere clutter to extend. Suppressing varying ionosphere clutter and exploring obscured targets are challenging tasks for high frequency surface wave radar (HFSWR).
Xiaowei Ji, Jiaming Li 0016, Qiang Yang 0003, Linwei Wang, Ying Suo, Xiaochuan Wu   +5 more
openaire   +3 more sources

Ionospheric effects on synthetic aperture radar (SAR) clutter statistics

IET Radar, Sonar & Navigation, 2013
Low‐frequency space‐based synthetic aperture radar (SAR) is an ideal sensor for measuring forest biomass, but can suffer from ionospheric effects. The variation in total electron content (TEC), originating from ionospheric turbulence, causes the along track point spread function (PSF) to degrade in a manner which depends on ...
David P. Belcher, Paul S. Cannon
openaire   +1 more source

Parker Solar Probe Observations of Proton Core‐Beam Distributions in Heliospheric Current Sheet Region: Quasilinear Instability Analysis Combined With Collisional Relaxation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract Parker Solar Probe has been proven as instrumental for the observation of young solar wind. During the encounters E‐07 and E‐08, PSP recorded the core plus beaming protons crossing the heliospheric current Sheet region. When the observed PSP data is plotted in the temperature ratio versus parallel beta space, it is found that the occurrence ...
M. Rashid, P. H. Yoon, J. Huang, C. Salem, M. Sarfraz, S. Alnussirat, R. A. López, J. Seough, H. Xie, D. Larson, R. Livi   +10 more
wiley   +1 more source

Cognitive HF radar

The Journal of Engineering, 2019
Radars operating in the high-frequency (HF) band can exploit propagation modes other than line-of-sight and are hence widely employed to provide over-the-horizon surveillance and remote sensing.
Stuart Anderson
doaj   +1 more source

Enhancing Low‐Latitude Ionospheric Irregularity Prediction With Generalized Linear Models

Space Weather, Volume 24, Issue 3, March 2026.
Abstract The ionosphere poses challenges for accurate forecasting due to its complexity and variability. Irregularities in the lower ionosphere are influenced by local time, season, geographic location, solar activity and space weather, complicating precise predictions.
Alysson Brhian, Marco A. Ridenti, Francisco Azpilicueta, Mauricio Gende, Marisa Roberto   +4 more
wiley   +1 more source

A probabilistic hypothesis density filter for traffic flow estimation in the presence of clutter [PDF]

, 2012
Prediction of traffic flow variables such as traffic volume, travel speed or travel time for a short time horizon is of paramount importance in traffic control.
Romain Billot, Mihaylova, Lyudmila, Nour-Eddin El Faouzi, Matthieu Canaud, Sau, Jacques, Jacques Sau, Lyudmila Mihaylova, Canaud, Matthieu, El Faouzi, Nour-Eddin, Billot, Romain   +9 more
core   +1 more source