Results 111 to 120 of about 2,767,562 (223)

Quasiperiodic Super-Alfvénic Slippage along Flare Ribbons Observed by the Interface Region Imaging Spectrograph

The Astrophysical Journal Letters
The apparent slipping motion of flare loops is regarded as a key feature of the 3D magnetic reconnection in the solar flares. The slippage with a super-Alfvénic speed could be defined as slipping–running reconnection, while the slippage with a sub ...
Yining Zhang, Ting Li, Yijun Hou, Xuchun Duan, Zheng Sun, Guiping Zhou   +5 more
doaj   +1 more source

Multimode Quasiperiodic Pulsations in Extreme-ultraviolet Emissions Associated with an X-Class Solar Flare

The Astrophysical Journal
Abstract We report detection of quasi-periodic pulsations in extreme-ultraviolet (EUV) emissions during the peak phase of an X-class solar flare. Temporal variation of EUV intensity in 171 Å and 335 Å channels of SDO/AIA were analyzed using wavelet transform, Ensemble Empirical Mode Decomposition (EEMD), Hilbert–Huang spectral ...
Sachin Rajkapoor Kanaujiya, Ram Ajor Maurya, Valery M. Nakariakov   +2 more
openaire   +1 more source

Markov‐Chain Monte Carlo Reconstruction of Emission Measure Distributions: Application to Solar Extreme‐Ultraviolet Spectra

The Astrophysical Journal, 1998
We have developed a new method for the reconstruction of differential emission measure distributions based on a Metropolis Markov-chain Monte Carlo (MCMC[M]) method. This technique allows us to (1) relax nonphysical smoothness constraints generally imposed on DEMs, (2) determine confidence bounds on the computed values, and (3) include extra ...
Vinay Kashyap, Jeremy J. Drake
openaire   +1 more source

Data‐Guided Photocatalysis: Supervised Machine Learning in Water Splitting and CO2 Conversion

Advanced Intelligent Discovery, EarlyView.
This review highlights recent advances in supervised machine learning (ML) for photocatalysis, emphasizing methods to optimize photocatalyst properties and design materials for solar‐driven water splitting and CO2 reduction. Key applications, challenges, and future directions are discussed, offering a practical framework for integrating ML into the ...
Paul Rossener Regonia, Christian Mark Pelicano   +1 more
wiley   +1 more source

Quasiperiodic Oscillations of Flare Loops and Slipping Motion of Ribbon Substructures during a C-class Flare

The Astrophysical Journal
Quasiperiodic oscillations in solar-flaring emission have been observed over the past few decades. To date, the underpinning processes resulting in the quasiperiodic oscillations remain unknown.
Yining Zhang, Ting Li, Jing Ye
doaj   +1 more source

Transient coronal extreme ultraviolet emission before and during the impulsive phase of a solar flare

The Astrophysical Journal, 1989
Transient coronal EUV emission, recorded in an emission line of Fe XI at 180.4 A, has been observed prior to and during the initial stages of a solar flare. This emission provides direct evidence of the interactions between the lower corona and the chromosphere during flare initiation.
openaire   +1 more source

Accelerating Materials Discovery: A Review of Machine Learning in X‐Ray Absorption Spectroscopy

Advanced Intelligent Systems, EarlyView.
This review systematically details how machine learning transforms X‐ray absorption spectroscopy (XAS) analysis. It covers advanced deep learning architectures for structure‐spectra mapping and inverse tasks, while discussing key challenges like the simulation‐to‐reality gap.
Melaku Lake Tegegne, Haodong Yao, Liyuan Wu, Yihe Pang, Fazhi Qi, Lina Zhao   +5 more
wiley   +1 more source

Green Hydrogen for Public Transportation: Insights From an ABM and From Palma de Mallorca Case Study

Business Strategy and the Environment, EarlyView.
ABSTRACT The development of green hydrogen (GH2) value chains is crucial for decarbonizing sectors such as transport and industry. Their emergence, however, requires coordination among diverse actors, technologies, and regulations, which traditional analytical approaches struggle to capture.
Roberta De Cristofaro, Cristina Ponsiglione, Simonetta Primario   +2 more
wiley   +1 more source

Solar Atmospheric Oscillations as Measured by the GOES-R Series EXIS EUVS-C Instrument

The Astrophysical Journal Letters
This Letter presents first observations of distinct solar atmospheric oscillations from signals collected by the Extreme Ultraviolet and X-ray Irradiance Sensors EUVS-C instrument, which is part of each Geostationary Observational Environmental Satellite
Thomas D. Eden Jr., Francis. G. Eparvier, Andrew R. Jones, William E. McClintock, Donald L. Woodraska, Tom Woods, Martin Snow   +6 more
doaj   +1 more source

Bismuth‐Based Semiconductors in Photocatalytic CO2 Reduction: Catalysts, Progress, and Future Perspectives

Carbon and Hydrogen, EarlyView.
This review systematically summarizes research progress on bismuth‐based semiconductor photocatalytic materials in the field of CO2 reduction. It focuses on elucidating the mechanisms by which four modification strategies—including heteroatom doping, oxygen vacancy engineering, microstructural control, and heterostructure fabrication—regulate band ...
Shuisen He, Guodong Zhang, Mengchi Guo, Song Zhong, Jie Yang, Tongrui Zhang, Xingye Zeng   +6 more
wiley   +1 more source