Results 31 to 40 of about 232 (143)

Advancing Ensemble Streamflow Prediction Through Satellite‐Based Precipitation Product and Model Parameter Uncertainty Quantification

Journal of Advances in Modeling Earth Systems, Volume 17, Issue 10, October 2025.
Abstract Satellite‐based quantitative precipitation estimates (QPE), such as NASA's Integrated Multi‐satellitE Retrievals for GPM (IMERG), provide easily accessible continental‐to‐global precipitation forcings for flood prediction and other hydrologic applications.
Kaidi Peng, Daniel B. Wright, Yagmur Derin, G. Aaron Alexander, Ankita Pradhan, Davide Zoccatelli, Samantha H. Hartke, Zhe Li, Jackson Tan   +8 more
wiley   +1 more source

Fault Network Geometry Modulates Earthquake Source Spectra Across Scales

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract Earthquake source spectra provide unique insights into the earthquake rupture process. Motivated by previous research suggesting that complex fault geometries enhance high‐frequency seismic radiation, we study the influence of fault network geometry on earthquake source spectra using multiple independent observations.
Jaeseok Lee, Victor C. Tsai, Daniel T. Trugman, Greg Hirth, Avigyan Chatterjee   +4 more
wiley   +1 more source

Ambiguity and area preserving linear transformations in over‐the‐horizon radar

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
The use of recurrent waveforms in over‐the‐horizon radar (OTHR) necessitates techniques for ambiguity resolution and manipulation. In this paper, the authors elucidate methods for systematically transforming any given waveform so that its ambiguity function is transformed by any desired area preserving the linear transformation of the delay‐Doppler ...
Stephen D. Howard, Van Khanh Nguyen
wiley   +1 more source

Circular synthetic aperture radar sub‐aperture angle information complementation based on azimuth‐controllable generative adversarial network

IET Radar, Sonar &Navigation, Volume 18, Issue 10, Page 1779-1795, October 2024.
Specifically, the authors propose a novel CGAN architecture that can control the azimuth angle for arbitrary angle generation, capable of complementing missing CSAR sub‐aperture information. The network incorporates angular labels for various scenarios and integrates a dynamic region‐aware convolution (DRconv) module.
Bingxuan Li, Yanheng Ma, Lina Chu, Wei Li, Yuanping Shi   +4 more
wiley   +1 more source

On the Use of SuperDARN Ground Backscatter Measurements for Ionospheric Propagation Model Validation

Space Weather, Volume 22, Issue 9, September 2024.
Abstract Prior to use in operational systems, it is essential to validate ionospheric models in a manner relevant to their intended application to ensure satisfactory performance. For Over‐the‐Horizon radars (OTHR) operating in the high‐frequency (HF) band (3–30 MHz), the problem of model validation is severe when used in Coordinate Registration (CR ...
Joshua J. Ruck, David R. Themens, Pasha Ponomarenko, Angeline G. Burrell, Bharat Kunduri, J. Michael Ruohoniemi, Sean Elvidge   +6 more
wiley   +1 more source

A chirplet‐based masking algorithm for smeared spectrum jamming suppression and signal separation

IET Radar, Sonar &Navigation, Volume 18, Issue 9, Page 1409-1430, September 2024.
The authors propose a chirplet‐based masking algorithm that can solve the problem of SMSP jamming suppression and address a more complex problem: the separation of jamming signal and multiple LFM signals from intercepted mixed signal. First, the authors obtain matched chirp rates of the source signals through the changing tendency of the Rényi entropy.
Yifan Wang, Yibing Li, Gang Yu, Xiaoyu Geng, Zitao Zhou   +4 more
wiley   +1 more source

Study on the Influence of Evaporation Duct on Electromagnetic Wave Propagation in the Bay Area of West Indian Ocean

工程科学与技术, 2017
:According to insufficient research on the effect of evaporation duct on the propagation of electromagnetic wave in the bay area of West Indian Ocean,PJ evaporation duct model and parabolic equation method were used to investigate the feasibility of ...
田斌, 葛义军, 李晖宙, 于萍, 崔玉娟   +4 more
doaj  

Extremely Long‐Range Observations of Ionospheric Irregularities in a Large Longitude Zone From Pacific to Africa Using a Low Latitude Over‐The‐Horizon Radar in China

Geophysical Research Letters, Volume 51, Issue 16, 28 August 2024.
Abstract Monitoring the generation and movement of equatorial plasma bubbles (EPBs) in a large longitude region is crucial important for better understanding their day‐to‐day variability. Using the newly developed Low lAtitude long Range Ionospheric raDar (LARID) at Dongfang (19.2°N, 108.8°E, dip lat.
Lianhuan Hu, Guozhu Li, Baiqi Ning, Guofeng Dai, Wenjie Sun, Xiukuan Zhao, Haiyong Xie, Yi Li, Bo Xiong, Yu Li, Michi Nishioka, Septi Perwitasari   +11 more
wiley   +1 more source

Surface waves magnitude estimation from ionospheric signature of Rayleigh waves measured by Doppler sounder and OTH radar. [PDF]

Sci Rep, 2018
Occhipinti G, Aden-Antoniow F, Bablet A, Molinie JP, Farges T.   +4 more
europepmc   +1 more source

Precursor-free eruption triggered by edifice rupture at Nyiragongo volcano. [PDF]

Nature, 2022
Smittarello D, Smets B, Barrière J, Michellier C, Oth A, Shreve T, Grandin R, Theys N, Brenot H, Cayol V, Allard P, Caudron C, Chevrel O, Darchambeau F, de Buyl P, Delhaye L, Derauw D, Ganci G, Geirsson H, Kamate Kaleghetso E, Kambale Makundi J, Kambale Nguomoja I, Kasereka Mahinda C, Kervyn M, Kimanuka Ruriho C, Le Mével H, Molendijk S, Namur O, Poppe S, Schmid M, Subira J, Wauthier C, Yalire M, d'Oreye N, Kervyn F, Syavulisembo Muhindo A.   +35 more
europepmc   +1 more source