Results 51 to 60 of about 279 (160)

Tropospheric Propagation Effects Extracted From ADS‐B Messages

Engineering Reports, Volume 7, Issue 12, December 2025.
This study explores the use of ADS‐B messages to estimate tropospheric effects, effectively isolating atmospheric influences from interference. The approach enables independent lower atmosphere studies and offers a cost‐free supplementary method for satellite applications, benefiting GNSS systems, especially at low elevation angles where multipath and ...
Alina‐Mihaela Badescu
wiley   +1 more source

Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract Dielectric anisotropy in ice alters the propagation of polarized radio waves, so polarimetric radar sounding can be used to survey anisotropic properties of ice masses. Ice anisotropy is either intrinsic, associated with ice‐crystal orientation fabric (COF), or extrinsic, associated with material heterogeneity, such as bubbles, fractures, and ...
Benjamin H. Hills, T. J. Young, David A. Lilien, Esther Babcock, Nicole Bienert, Donald Blankenship, John Bradford, Giancorrado Brighi, Alex Brisbourne, Jørgen Dall, Reinhard Drews, Olaf Eisen, M. Reza Ershadi, Tamara A. Gerber, Nicholas Holschuh, Daniela Jansen, Thomas M. Jordan, Nanna B. Karlsson, Jilu Li, Carlos Martín, Kenichi Matsuoka, Daniel May, Falk M. Oraschewski, John Paden, Nicholas M. Rathmann, Neil Ross, Dustin M. Schroeder, Martin Siegert, Matthew R. Siegfried, Emma Smith, Ole Zeising   +30 more
wiley   +1 more source

Strain Rates Along the Alpine‐Himalayan Belt From a Comprehensive GNSS Velocity Field

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 12, December 2025.
Abstract The Alpine‐Himalayan belt is one of Earth's most dynamic and complex regions, characterized by intense tectonic deformation and seismicity. Comprehensive analyses of continental‐scale crustal deformation and seismic hazards along this extensive orogenic belt require the compilation of large geodetic data sets.
N. Castro‐Perdomo, S. Jónsson, Y. Klinger, F. Masson, T. W. Becker, K. Johnson   +5 more
wiley   +1 more source

Ship Echo Discrimination in HF Radar Sea-Clutter

, 2003
International audienceHF radar can provide Over the Horizon detection of ships on very large oceanic areas, making use of the ionospheric refraction of radio waves. The Doppler spectrum of the sea clutter is composed of the first-order Bragg lines with a
Bourdillon, Alain, Auffray, Gilbert, Dorey, Philippe   +2 more
core   +1 more source

High Frequency Radar Perspective of Putative Subglacial Liquid Water on Mars

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract Anomalously bright radar reflections from the base of Mars' south polar cap raise the tantalizing possibility of present‐day liquid water. Orosei et al. (2018, https://doi.org/10.1126/science.aar7268) first reported bright subsurface echoes from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) prompting studies of ...
Gareth A. Morgan, Matthew R. Perry, Bruce A. Campbell, Nathaniel E. Putzig, Jennifer L. Whitten, Fabrizio Bernardini   +5 more
wiley   +1 more source

Dominant Longitudinal Wave‐1 Pattern of the Equatorial Topside Ionosphere in the Early Morning Sector

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract The low‐latitude ionosphere has complex longitude structures under the effects of various space environment factors such as non‐migrating tides and the geomagnetic field. In this study, a distinctive wave‐1 dominated longitude pattern occurring in the early morning sector was revealed from the ROCSAT‐1 observation for the low‐latitude topside ...
Yiding Chen, Libo Liu, Huijun Le, Ruilong Zhang   +3 more
wiley   +1 more source

Study on the Detectability of the Sky-Surface Wave Hybrid Radar

Journal of Applied Mathematics, 2014
Working in the HF (high-frequency) band and the transmitter and receiver locating separately, the sky-surface wave hybrid radar both has the capabilities of the OTHR (over-the-horizon radar) and the advantage of the bistatic radar. As the electromagnetic
Hou Chengyu, Ke Guo, Shi Tiange, Wang Yuxin   +3 more
doaj   +1 more source

Satellite Traces: Ionogram Signatures of Bottom‐Side Upwelling Structures ‐ A Simulation Study

Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.
Abstract Satellite Traces (STs) are the important ionogram signatures for the presence of upwellings in the bottom‐side ionosphere, which provide the necessary seed perturbation for the development of equatorial plasma bubbles (EPBs). In this study, a virtual ionosonde experiment is simulated to investigate the various ST signatures under the presence ...
M. Ankita, S. Tulasi Ram, T. Yokoyama, R. T. Tsunoda, A. P. Dimri, S. Mondal, Chinmaya Nayak   +6 more
wiley   +1 more source

Electron Beams Generated by the Electron Kelvin‐Helmholtz Instability at a Quasi‐Perpendicular Shock

Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.
Abstract Electron beams are considered to be important free energy sources for the excitation of various plasma waves at quasi‐perpendicular shocks. In this article, we perform a two‐dimensional particle‐in‐cell simulation of a low‐plasma‐β quasi‐perpendicular shock.
Ao Guo, Quanming Lu, San Lu, Xinliang Gao, Zhongwei Yang   +4 more
wiley   +1 more source

Statistical Characteristics of Nighttime ULF Waves Observed on the Surface of Mars by InSight

Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.
Abstract Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) Fluxgate Magnetometer returned data from the Martian surface throughout the course of the InSight mission, between November 2018 and May 2022. Ultra‐low frequency (ULF) electromagnetic waves are commonly observed by InSight during nighttime hours.
K. Webster, Y. Ma, S. Joy, P. J. Chi
wiley   +1 more source