Results 31 to 40 of about 961,519 (212)

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source

Solar and stellar photospheric abundances

Living Reviews in Solar Physics, 2016
The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations. Improving those foundations to refine the accuracy of the inferred abundances has proven challenging, but progress has been made.
openaire   +3 more sources

MAGNETOHYDRODYNAMICS OF THE WEAKLY IONIZED SOLAR PHOTOSPHERE [PDF]

The Astrophysical Journal, 2012
We investigate the importance of ambipolar diffusion and Hall currents for high-resolution comprehensive ('realistic') photospheric simulations. To do so we extended the radiative magnetohydrodynamics code \emph{MURaM} to use the generalized Ohm's law under the assumption of local thermodynamic equilibrium.
Cheung, M., Cameron, R.
openaire   +3 more sources

A High-resolution, Inversion-based Synoptic Study of Solar Granulation

The Astrophysical Journal
The convectively driven, weakly magnetized regions of the solar photosphere dominate the Sun’s surface at any given time, but the temporal variations of these quiet regions of the photosphere throughout the solar cycle are still not well known.
James W. Crowley, Ivan Milić, Gianna Cauzzi, Kevin Reardon   +3 more
doaj   +1 more source

Forecasting Continuum Intensity for Solar Active Region Emergence Prediction Using Transformers

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract Early and accurate prediction of solar active region (AR) emergence is crucial for space weather forecasting. Building on established Long Short‐Term Memory (LSTM) based approaches for forecasting the continuum intensity decrease associated with AR emergence, this work expands the modeling with new architectures and targets.
Jonas Tirona, Sarang Patil, Spiridon Kasapis, Eren Dogan, John Stefan, Irina N. Kitiashvili, Alexander G. Kosovichev, Mengjia Xu   +7 more
wiley   +1 more source

Simulated magnetic flows in the solar photosphere [PDF]

Astronomy & Astrophysics, 2015
Recent Sunrise/IMaX observations have revealed the existence of supersonic magnetic flows. Our aim is to determine the origin of such flows by using realistic MHD simulations. We simulate cancellation and emergence of magnetic flux through the solar photosphere. Our first numerical experiment starts with magnetic field of both polarities.
Danilovic, S., Cameron, R., Solanki, S.
openaire   +3 more sources

Optimization Algorithm for Determining the Source Surface Radius Based on Parker Solar Probe In Situ Measurements From Encounters 1 to 19

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract The Potential Field Source Surface (PFSS) extrapolation is a method for estimating the large scale coronal magnetic field from photospheric magnetograms. The source surface serves as the outer boundary of its solution domain, and is typically a spherical surface.
Shiouhe Wang, Fang Shen, Yi Yang, Xueshang Feng, Jiansen He   +4 more
wiley   +1 more source

Granular Spots in the Solar Photosphere

The Astrophysical Journal Letters
Granulation and sunspots are fundamental structures of the solar photosphere. Here, we discover the universal dark regions in TiO images from the New Vacuum Solar Telescope and name them granular spots (GSs).
Shaoxuan Tong, Jun Zhang, Zhenyu Jin
doaj   +1 more source

The effect of colour on the thermal performance of building integrated solar collectors [PDF]

, 2010
The use of solar collectors with coloured absorbers for water heating is an area of particular interest when considering their integration with buildings.
Carson, James K., Duke, Mike, Anderson, Timothy Nicholas   +2 more
core   +1 more source

Identifying Coronal Sources of L1 Solar Wind Disturbances Using the Fisk Heliospheric Magnetic Field and Potential Field Extrapolations during Three Solar Minima

The Astrophysical Journal
The solar minima between solar cycles 22–23, 23–24, and 24–25 are the best observed minima on record. In situ solar wind and interplanetary magnetic field measurements by the Wind and ACE spacecraft at L1 with 1 hr cadence are explored using wavelet ...
P. J. Steyn, D. Johnson, G. J. J. Botha, S. Régnier   +3 more
doaj   +1 more source