Results 71 to 80 of about 3,072 (224)
Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.Abstract Solar superflares of S‐class (>X10 in soft X‐rays) pose extreme space weather hazards, yet their prediction remains a fundamental challenge owing to their rapid and transient natures and the limitations of conventional event‐based forecasts. We introduce for the first time, a probabilistic spatiotemporal framework designed to identify extended
V. M. Velasco Herrera +12 more
wiley +1 more source
Impulsively generated two-fluid magnetoacoustic-gravity waves: Solar chromosphere heating and plasma outflows [PDF]
, 2022 Context. We use a two-fluid model to study the heating of the solar chromosphere by magnetoacoustic and magnetoacoustic-gravity waves. In the model, we include energy dissipation as a result of ion–neutral collisions. Aims.
Poedts, Stefaan +9 more
core +1 more source
The magnetic sensitivity of the Ca II H and K lines
Astronomy & AstrophysicsContext. The solar chromosphere is a transition layer between the cool, dense photosphere and the hot, rarefied corona. This boundary region plays a key role in regulating energy transport and structuring the magnetic field throughout the solar ...
Kriginsky M. +4 more
doaj +1 more source
MORPHOLOGY AND DYNAMICS OF THE LOW SOLAR CHROMOSPHERE [PDF]
The Astrophysical Journal, 2009 accepted by ApJ, 16 pages, 8 ...
Wöger, F. +3 more
openaire +2 more sources
Space Weather Impact of Three Solar Flares Observed by the POEMAS Telescope at 45 and 90 GHz
Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.Abstract Solar flares are often associated with coronal mass ejections (CMEs) that, when directed toward Earth, can disrupt the magnetosphere and impact space weather. In this study, we investigate three long‐duration solar flares observed in 2012 by the POlarization Emission of Millimeter Activity at the Sun (POEMAS) telescopes at 45 and 90 GHz.
Adriana Valio +4 more
wiley +1 more source
Structure and dynamics of the solar chromosphere [PDF]
, 2002 The thesis "Structure and dynamics of the solar chromosphere" of J.M. Krijger is a study on the behavior of the solar chromosphere, the thin layer just above the solar surface (photosphere) visible in purple red light during a total solar eclipse.
Krijger, Johannes Mattheus
core
Measurement of Turbulence Injection Scale Down to the Chromosphere
The Astrophysical Journal LettersThe solar atmosphere displays a sharp temperature gradient, starting from spicules in the chromosphere at 2 × 10 ^4 K, outward into the corona exceeding ${10}^{6}$ K.
Zachary Bailey +3 more
doaj +1 more source
Radiative Diagnostics in the Solar Photosphere and Chromosphere [PDF]
Space Science Reviews, 2016 Accepted for publication in Space Science Reviews.
J. de la Cruz Rodríguez, M. van Noort
openaire +4 more sources
Space Weather, Volume 23, Issue 11, November 2025.Abstract A new daily composite of the solar flare index (SFI) and the hemispherically‐resolved versions (hSFI) are presented for 1937 to 2024. The data set confirms that the northern hemisphere (NH) dominated solar flare activity during Solar Cycles 17 to 21, but that the southern hemisphere has dominated from Solar Cycle 22 to present.
V. M. Velasco Herrera +14 more
wiley +1 more source
Solar Radio Wide‐Band Spectroscopy and Imaging Facilities of the Chinese Meridian Project Phase II
Space Weather, Volume 23, Issue 11, November 2025.Abstract Solar eruptions, including flares and coronal mass ejections, are the most energetic phenomena in the solar system. These explosive events accelerate high‐energy particles and generate electromagnetic radiation from radio to gamma‐ray wavelengths, producing heliospheric disturbances and acting as primary drivers of space weather hazards.
Yihua Yan +19 more
wiley +1 more source