Results 111 to 120 of about 58,091 (257)

The Occurrence of Powerful Flares Stronger than X10 Class in Solar Cycles

The Astrophysical Journal Letters
Solar flares stronger than X10 (S-flares,  >X10) are the highest-class flares that significantly impact on the Sun's evolution and space weather. Based on observations of Geostationary Orbiting Environmental Satellites at soft X-ray wavelength and the ...
Baolin Tan, Yin Zhang, Jing Huang, Kaifan Ji   +3 more
doaj   +1 more source

Global solar photospheric and coronal magnetic field over activity cycles 21–25

Journal of Space Weather and Space Climate
The evolution of the global solar magnetic field from the beginning of cycle 21 (mid-1970s) until the currently-ascending cycle 25 is described using photospheric full-disk and synoptic magnetograms from NSO Kitt Peak Vacuum Telescope (KPVT) 512-channel ...
Petrie Gordon J. D.
doaj   +1 more source

Cu‐Pd Dual Single Atoms Promoting Selective CO2 Photoreduction to C2 Products in Seawater

Advanced Materials, EarlyView.
Cu and Pd dual single atoms anchored on TiO2 cooperatively enhance C─C coupling during CO2 photoreduction in seawater. Under xenon‐light irradiation and without a sacrificial reagent/alkaline trapping agent, the catalyst achieves highly selective acetic acid formation.
Elhussein M. Hashem, Yiran Jiao, Amin Talebian‐Kiakalaieh, Xin Xu, Shiying Ren, Teng Liang, Wenzhong Ji, Teng Lu, Yun Liu, Bingquan Xia, Ashley Slattery, Jingyu Wang, Feiyan Xu, Ping She, Yan Jiao, Jingrun Ran   +15 more
wiley   +1 more source

An Improved Prediction of Solar Cycles 25 and 26 Using the Informer Model: Gnevyshev Peaks and North–South Asymmetry

The Astrophysical Journal
Forecasting the amplitude and timing of the sunspot cycle is highly important for solar physics and space weather applications, but high-precision prediction of solar magnetic activity has remained an outstanding challenge.
Jie Cao, Tingting Xu, Linhua Deng, Xueliang Zhou, Shangxi Li, Yuxia Liu, Wenhua Wang, Weihong Zhou   +7 more
doaj   +1 more source

Electrocatalyst/Semiconductor Interfaces in Photoelectrocatalysts: Mechanistic Analysis of the Impact of Nanoparticle Electrocatalyst Coverage on Performance

Advanced Materials, EarlyView.
Reducing Ni nanoparticle coverage on n‐Si photoanodes enhances photovoltage by promoting thicker interfacial SiOx formation during photoelectrochemical oxygen evolution reaction (OER). Experiments, analytical modeling, and finite‐element simulations reveal that coverage‐dependent chemical interface evolution, rather than geometric effects alone ...
Aarti Mathur, Ahmet Sert, Suljo Linic
wiley   +1 more source

Solar Cycles: Can they be Predicted?

Research Notes of the AAS
Abstract The solar magnetic field, thought to be generated by the motion of plasma within the Sun, alternates on the order of 11 yr cycles and is incompletely understood. Industries rely on accurate forecasts of solar activity, but can solar cycles be predicted? Of more than 100 predictions for cycle 25, most underestimated the amplitude
openaire   +2 more sources

Detailed understanding of reduced geoeffectiveness of solar cycle 24 in association with geomagnetic storms

Frontiers in Astronomy and Space Sciences
Solar Cycle 24, the weakest in over a century, exhibited significant deviations from previous cycles, beginning with a prolonged minimum, weak polar fields, and asynchronous polar field reversal, leading to hemispheric asymmetry.
R. Selvakumaran, Sneha A. Gokani, Shirsh Lata Soni   +2 more
doaj   +1 more source

Engineering the Assembly Freedom of Donor–Acceptor Type Self‐Assembled Monolayers Toward Efficient and Stable Flexible Perovskite Photovoltaics

Advanced Materials, EarlyView.
Assembly freedom engineering breaks the vertical alignment constraint of donor–acceptor self‐assembled monolayers, tuning their assembly freedom to achieve quasi‐random molecular orientation. This strategy simultaneously boosts interfacial charge transport and mechanical robustness, enabling high‐efficiency and mechanically stable flexible perovskite ...
Biao Zhou, Guosen Zhang, Hao Wang, Juntao Zhao, Ruijia Zhang, Hong Zhang, Mingwei An, Yue Wang, Yang Wang, Wallace C. H. Choy   +9 more
wiley   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

The Recent Anomalously Weak Polar Field Does Not Imply a Weak Field at Solar Cycle 25 Minimum

The Astrophysical Journal Letters
The ongoing solar cycle 25 has progressed past its peak of sunspot numbers, being stronger than the previous cycle 24. However, the present polar field is rather weak compared to previous cycles at the same evolution phase, particularly in the northern ...
Zi-Fan Wang, Jie Jiang, Yukun Luo, Ruihui Wang, Xinchun Ma, Jing-Xiu Wang   +5 more
doaj   +1 more source