Results 31 to 40 of about 423,592 (152)

The Temporal Evolution of Nonneutralized Electric Currents and the Complexity of Solar Active Regions

The Astrophysical Journal
We study the evolution of electric currents during the emergence of magnetic flux in the solar photosphere and the differences exhibited between solar active regions of different Hale complexity classes. A sample of 59 active regions was analyzed using a
Ioannis Kontogiannis, Manolis K. Georgoulis   +1 more
doaj   +1 more source

South Africa's Inflation: Monetary or Fiscal

South African Journal of Economics, Volume 94, Issue 4, December 2026.
ABSTRACT Conventional macroeconomics has viewed inflation as a monetary phenomenon through the quantity theory of money. Ever‐increasing sovereign debt globally has caused concern amongst economists. These concerns follow not from the ability of governments to repay their debt, but rather the impact of sizeable debt portfolios on price levels.
Guangling Liu, Christopher D. Solomon
wiley   +1 more source

Simulations of Switchback, Fragmentation and Sunspot Pair in δ-Sunspots during Magnetic Flux Emergence

, 2021
Strong flares and coronal mass ejections (CMEs), launched from δ-sunspots, are the most catastrophic energy-releasing events in the solar system.
Che-Jui Chang, Jean-Fu Kiang
core   +1 more source

A Causal Examination of the Solar Influence on Holocene Climate

Geophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract Variations in Total Solar Irradiance (TSI) have long been hypothesized to influence global mean surface temperature (GMST) on multidecadal to millennial timescales, but empirical evidence has remained elusive. Here, we explore the link between solar variability and climate over the pre‐industrial Holocene, when anthropogenic influences were ...
Jordan P. Landers, Julien Emile‐Geay, Alexander K. James, Stephan B. Munch, Deborah Khider, Edouard Bard   +5 more
wiley   +1 more source

A Review of Artificial Intelligence in Ophthalmology: Key Aspects, Challenges, and Future Directions

Eye &ENT Research, Volume 3, Issue 3, Page 125-154, September 2026.
ABSTRACT Artificial intelligence (AI) is increasingly reshaping ophthalmology because the specialty depends heavily on structured imaging, quantitative measurements, and repeatable diagnostic workflows. This review provides a clinically grounded and translationally oriented synthesis of AI in ophthalmology, covering methodological foundations ...
Partha Pratim Ray
wiley   +1 more source

A Solar Analog Model for Decrease in Far Ultraviolet Irradiance Under a Grand Minimum

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract Solar analog field stars having a range of magnetic activity can provide an estimate of solar spectral irradiance (SSI) variability relevant to understanding the Sun's influence on terrestrial climate. This approach is particularly useful for far ultraviolet (FUV) irradiance that cannot be observed from the Earth surface.
D. Lubin, C. Melis, D. Tytler
wiley   +1 more source

EL ROL DEL ALGORITMO DE ENTRENAMIENTO EN LA SELECCIÓN DE MODELOS DE REDES NEURONALES ROLE OF THE TRAINING ALGORITHM IN MODEL SELECTION ON NEURAL NETWORKS

Revista U.D.C.A Actualidad & Divulgación Científica, 2011
La capacidad de ajuste de una red neuronal se ve a menudo afectada por la configuración usada, en especial, en relación al número de neuronas ocultas y de variables de entrada, toda vez que, a medida que el número de parámetros del modelo aumenta, se ...
Paola Sánchez, Juan Velásquez
doaj  

High speed photospheric material flow observed at the polarity inversion line of a delta-type sunspot producing an X5.4 flare on 7 March 2012

, 2014
Solar flares abruptly release the free energy stored as a non-potential magnetic field in the corona and may be accompanied by eruptions of the coronal plasma. Formation of a non-potential magnetic field and the mechanisms for triggering the onset of flares are still poorly understood.
Shimizu, Toshifumi, Lites, Bruce W., Bamba, Yumi   +2 more
openaire   +2 more sources

On the Effects of the Solar Wind Structure in the Global Distribution of dBH/dt ${\text{dB}}_{H}/\text{dt}$ Spikes During Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Variations in the solar wind, particularly those associated with interplanetary coronal mass ejections (ICMEs) and high‐speed streams (HSSs), drive geomagnetic disturbances that produce rapid changes in the ground magnetic field. These variations, commonly quantified by the time derivative of the horizontal magnetic field dBH/dt $\left({\text ...
José P. Marchezi, Amy Keesee, Michael Coughlan, Raman Mukundan, Victor Pinto, Ligia A. Da Silva, Livia R. Alves, Hyunju Connor, Don Hampton   +8 more
wiley   +1 more source

Iono‐PhyTAU: A Lightweight Global Ionospheric TEC Prediction Model Based on Temporal Attention Unit and Physical Condition Constraints of the Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Ionospheric Total Electron Content (TEC) is the primary error source causing signal delay in Global Navigation Satellite Systems (GNSS). High‐precision TEC prediction is essential for positioning, navigation, and space weather monitoring. Although deep learning models including ConvLSTM, ConvGRU, and Transformer have advanced TEC forecasting ...
Yiling Gui, Yajun Xu, Song Jia, Miaomiao Wang, Boyang Hao, Xinjie Wu   +5 more
wiley   +1 more source