Results 21 to 30 of about 525 (133)
MODELING THE SUN’S SMALL-SCALE GLOBAL PHOTOSPHERIC MAGNETIC FIELD [PDF]
The Astrophysical Journal, 2016 ABSTRACT We present a new model for the Sun’s global photospheric magnetic field during a deep minimum of activity, in which no active regions emerge. The emergence and subsequent evolution of small-scale magnetic features across the full solar surface is simulated, subject to the influence of a global supergranular flow pattern ...
K. A. Meyer, D. H. Mackay
openaire +3 more sources
Search for photospheric footpoints of quiet Sun transition region loops [PDF]
Astronomy & Astrophysics, 2007 CONTEXT:The footpoints of quiet Sun Transition Region (TR) loops do not seem to coincide with the photospheric magnetic structures appearing in traditional low-sensitivity magnetograms. AIMS: To look for the so-far unidentified photospheric footpoints of TR loops using G-band bright points (BPs) as proxies for photospheric magnetic field concentrations.
Sánchez Almeida, J. +5 more
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MAGNETIC UPFLOW EVENTS IN THE QUIET-SUN PHOTOSPHERE. I. OBSERVATIONS [PDF]
The Astrophysical Journal, 2015 12 pages, 6 figures, 2 ...
S. Jafarzadeh +2 more
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Centre-to-limb properties of small, photospheric quiet-Sun jets [PDF]
Astronomy & Astrophysics, 2015 9 pages, 9 ...
Rubio da Costa, F. +4 more
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PHOTOSPHERIC ABUNDANCES OF POLAR JETS ON THE SUN OBSERVED BYHINODE [PDF]
The Astrophysical Journal, 2015 Many jets are detected at X-ray wavelengths in the Sun's polar regions, and the ejected plasma along the jets has been suggested to contribute mass to the fast solar wind. From in-situ measurements in the magnetosphere, it has been found that the fast solar wind has photospheric abundances while the slow solar wind has coronal abundances. Therefore, we
Kyoung-Sun Lee +2 more
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The Sun's Global Photospheric and Coronal Magnetic Fields: Observations and Models [PDF]
Living Reviews in Solar Physics, 2012 61 pages, 18 figures.
Mackay, Duncan Hendry +1 more
openaire +5 more sources
Spectral Irradiance Observations and Projections for Solar Cycle 25
Earth and Space Science, Volume 13, Issue 4, April 2026.Abstract The Ozone Monitoring Instrument (OMI) on the Aura satellite makes near‐daily measurements of solar spectral irradiance (SSI) at wavelengths between 265 and 500 nm for instrument calibration purposes. The low degradation and exceptional stability of OMI's calibration during its lifetime facilitates the creation of a new 18‐year OMI Version 7 ...
Matthew T. DeLand +3 more
wiley +1 more source
Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.Abstract We present a novel data analysis technique based on physics‐informed neural networks (PINNs) to reconstruct two‐dimensional (2D) magnetohydrodynamic (MHD) and Hall MHD equilibria in a space plasma from in situ spacecraft measurements. Our method incorporates the steady‐state MHD or Hall MHD equations—a set of partial differential equations ...
Hiroshi Hasegawa +3 more
wiley +1 more source
Reconstructing Historical Solar Indices for Predicting Past Space Weather Events
Space Weather, Volume 24, Issue 4, April 2026.Abstract Modeling and forecasting the near‐Earth space environment, specifically the thermosphere, is particularly important because it affects the motion of low‐Earth orbit objects through atmospheric drag. Solar indices such as F10.7, S10.7, M10.7, and Y10.7 are commonly used as inputs to ionospheric and thermospheric density models.
Poshan Belbase +4 more
wiley +1 more source
Post‐Processing Probabilistic Forecasts of the Solar Wind by Data Mining Similar Scenarios
Space Weather, Volume 24, Issue 4, April 2026.Abstract The solar wind speed at Earth is one of the most important parameters regarding the effects of space weather on society. Thus far, most approaches for predicting the solar wind speed produce a single‐value time series without uncertainty, or utilize ensemble methods which require custom calibration development.
Daniel E. da Silva +3 more
wiley +1 more source