Results 51 to 60 of about 326 (121)

Emplacement Conditions and Alteration of Volcanic Deposits Inferred From Magnetic Properties of the ICDP Eger Drill Site S4 (Bažina Maar), Czechia

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Titanomagnetite in alkaline maar deposits exhibits variable syn‐ and post‐crystallization alteration linked to wet emplacement and groundwater fluctuations, which remain poorly documented. Magnetic and mineralogical analyses of lapilli, scoria, and basalt from ICDP Eger drill cores S4 and S4b (Bažina maar, western Eger Graben, Czechia) reveal ...
Johanna Berckhan, Agnes Kontny, Katarzyna Dudzisz, Jan Mrlina, Norbert Nowaczyk, Simo Spassov, Franziska D. H. Wilke   +6 more
wiley   +1 more source

Disentangling Internal Tides From Balanced Motions With Deep Learning and Surface Field Synergy

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 8, August 2026.
Abstract A fundamental challenge in ocean dynamics is disentangling balanced motions and internal waves. Extracting internal tidal (IT) imprints from surface data is a central part of this challenge. Traditional harmonic analysis fails under strong incoherence and poor temporal sampling, as in global satellite observations.
Han Wang, Jeffrey Uncu, Kaushik Srinivasan, Nicolas Grisouard   +3 more
wiley   +1 more source

Mitigation of Suppressive Interference in AMPC SAR Based on Digital Beamforming

Remote Sensing
Multichannel Synthetic Aperture Radar (MC-SAR) systems, such as Azimuth Multi-Phase Centre (AMPC) SAR, provide an effective solution for achieving high-resolution wide-swath (HRWS) imaging by reducing the pulse repetition frequency (PRF) to increase the ...
Zhipeng Xiao, Feng He, Zaoyu Sun, Zehua Zhang   +3 more
doaj   +1 more source

Auroral Amplitude Scintillations Revealed With High‐Rate Scintillation Indices From a GNSS Array

Space Weather, Volume 24, Issue 8, August 2026.
Abstract As Global Navigation Satellite Signals pass through the ionosphere, particularly at high latitudes, they can refract and diffract, resulting in a phenomenon known as scintillation. Irregularities of all scale sizes can cause scintillation to occur.
G. Blinstrubas, S. Datta‐Barua
wiley   +1 more source

A Novel Non-Stationary Clutter Suppression Approach for Space-Based Early Warning Radar Using an Interpulse Multi-Frequency Mode

Remote Sensing
The non-stationary clutter of space-based early warning radar (SBEWR) is more serious than that of airborne early warning radar. This phenomenon is primarily attributed to the Earth’s rotation and range ambiguity.
Ning Qiao, Shuangxi Zhang, Shuo Zhang, Qinglei Du, Yongliang Wang   +4 more
doaj   +1 more source

Localization and Classification of Gravity Wave Events From VIIRS Day/Night Band Satellite Imagery Using Machine Learning Techniques

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Gravity waves in the upper mesosphere produce diverse spatial patterns in nighttime airglow, but their global morphology has been difficult to characterize because manual identification is impractical for the massive satellite image archive. We developed a machine learning framework to detect and classify gravity wave events in imagery from ...
Yuta Hozumi, Jia Yue, Seraj Al Mahmud Mostafa, Chenxi Wang, Jianwu Wang, Sanjay Purushotham, Steven D. Miller   +6 more
wiley   +1 more source

PUSIF-DUNet: Deep SAR Imaging Network With Joint Optimization on Learnable Probabilistic Undersampling and Unambiguous Reconstruction

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Since the minimum antenna area constraint in the spaceborne single-channel synthetic aperture radar (SAR), it's difficult to achieve high-resolution and wide-swath imaging simultaneously.
Zirui Ma, Zhe Zhang, Bingchen Zhang, Xiaolan Qiu   +3 more
doaj   +1 more source

Improved MISO-SAR System Based on BiDirectional Imaging

Leida xuebao, 2015
In 2012, the German Aerospace Center (DLR.) proposed a BiDirectional mode that can achieve several seconds of repeated time lags by single star and single flight.
Jiang Hai, Song Hong-jun
doaj   +1 more source

A Signal Processing Method for Azimuth Multichannel SAR With Partial Channels Missing

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The azimuth multichannel synthetic aperture radar (SAR) system enhances spatial sampling by increasing channels, resolving the conflict between high resolution and wide mapping swath.
Zonglin Yang, Zhi Min Zhang, Fanlong Meng, Huaitao Fan, Chen Zhen, Yongwei Zhang, Sixi Hou, Yihai Wei   +7 more
doaj   +1 more source

Cascade Clutter Suppression Method for Airborne Frequency Diversity Array Radar Based on Elevation Oblique Subspace Projection and Azimuth-Doppler Space-Time Adaptive Processing

Remote Sensing
Airborne Frequency Diversity Array (FDA) radar operating at a high pulse repetition frequency encounters severe range-ambiguous clutter. The slight frequency increments introduced by the FDA result in angle and range coupling.
Rongwei Lu, Yifeng Wu, Lei Zhang, Ziyi Chen   +3 more
doaj   +1 more source