Results 31 to 40 of about 8,745 (214)
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 +4 more
wiley +1 more source
Long-Term Variations in Background Bias and Magnetic Field Noise in HSOS/SMFT Observations
UniverseThe Solar Magnetic Field Telescope (SMFT) at Huairou Solar Observing Station (HSOS) has conducted continuous observations of solar vector magnetic fields for nearly four decades, and while the primary optical system remains unchanged, critical components—
Haiqing Xu +7 more
doaj +1 more source
DIFFERENT MODES OF TURBULENCE IN THE ACTIVE REGIONS OF THE SOLAR PHOTOSPHERE
Odessa Astronomical Publications, 2013 In work the range of different methods for the analysis of characteristics of turbulent processes in the active regions of the solar photosphere has been used.
L. V. Kozak +2 more
doaj +1 more source
The UK Met Office’s Coronal Mass Ejection (CME) Ensemble Prediction System
Space Weather, Volume 24, Issue 7, July 2026.Abstract We describe the 24‐member Coronal Mass Ejection (CME) ensemble prediction system that is used operationally at the UK's Met Office Space Weather Operations Center (MOSWOC) to forecast the arrival time of CMEs at Earth. The ensemble system was built on ad‐hoc assumptions and there is the need to investigate whether the technique can be improved
Siegfried Gonzi +8 more
wiley +1 more source
THE SUN’S PHOTOSPHERIC CONVECTION SPECTRUM [PDF]
The Astrophysical Journal, 2015 Spectra of the cellular photospheric flows are determined from full-disk Doppler velocity observations acquired by the Helioseismic and Magnetic Imager (HMI) instrument on the Solar Dynamics Observatory (SDO) spacecraft. Three different analysis methods are used to separately determine spectral coefficients representing the poloidal flows, the toroidal
David H. Hathaway +3 more
openaire +2 more sources
Noble gases and nitrogen in material from asteroid Bennu
Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1593-1609, July 2026.Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty +7 more
wiley +1 more source
Quantifying the Impact of Relativistic Precession on Tidal Disruption Event Light Curves
Astronomische Nachrichten, Volume 347, Issue 5, June 2026.ABSTRACT The tidal field of a black hole can turn a star into a gas stream whose orbit can precess, especially if the a black hole is rapidly spinning. In this work, we investigate the impact of precession on the light curves of tidal disruption events (TDE).
Diego Calderón +4 more
wiley +1 more source
Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei
Astronomische Nachrichten, Volume 347, Issue 5, June 2026.ABSTRACT Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre‐existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources.
Patrik Milán Veres
wiley +1 more source
Apparent Photosphere of Massive Accretion-Disk Winds
, 2021 We examined the observational appearance of highly optically thick winds from supercritical accretion disks, while especially focusing on the shape of a “photosphere" of the wind. When a massive wind blows from an accretion disk, the optical depth of the
FUKUE, Jun +2 more
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