Results 61 to 70 of about 1,559,234 (209)
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
Multiline Spectropolarimetric Observation of Flare Ribbon Fine Structures with ViSP/DKIST
The Astrophysical JournalWe present an analysis of flare ribbon fine structure observed during a GOES C2-class flare using high spatial and spectral resolution multiline spectropolarimetric observations from the ViSP instrument at the DKIST. The ViSP recorded full Stokes spectra
Rahul Yadav +5 more
doaj +1 more source
Magnetoacoustic Portals and the Basal Heating of the Solar Chromosphere
The Astrophysical Journal, 2006 We show that inclined magnetic field lines at the boundaries of large-scale convective cells (supergranules) provide "portals" through which low-frequency ( 5 mHz) acoustic waves, which are believed to provide the dominant source of wave heating of the chromosphere. This result opens up the possibility that low-frequency magnetoacoustic waves provide a
James D. Armstrong +6 more
openaire +2 more sources
Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.Abstract During a solar flare, the fluxes in various lines and continua of the solar spectrum increase, leading to enhanced ionization of the illuminated part of the Earth's ionosphere and an increase in the total electron content (TEC $TEC$). It has been previously shown that nearly 50% of X‐class solar flares exhibit a second peak in warm coronal ...
S. Z. Bekker +2 more
wiley +1 more source
The Astrophysical JournalWe introduce an improved and fast inversion tool that is able to provide the thermodynamics of the solar atmosphere from the photosphere to the top of the chromosphere, as well as the integrated radiative losses (IRLs) in the chromosphere for data ...
Alberto Sainz Dalda +4 more
doaj +1 more source
Chromospheric Evaporation in Solar Flares
, 2012 Chromospheric evaporation suggests the mass upflows from chromosphere to corona after the electron heating at the chromosphere during the solar flares. It takes place at the rising phase, and has a typical timescale about 100 s and a typical speed about ...
Z. Ning, Zongjun Ning
core +1 more source
Heating of the solar chromosphere by ionization pumping
The Astrophysical Journal, 1981 A new theory is proposed to explain the heating of the solar chromosphere, and possibly the corona, by the dissipation of hydrodynamic compression waves. The basis of the dissipative mechanism, here referred to as ionization pumping, is hysteresis caused by irreversible relaxation of the chromospheric medium to ionization equilibrium following pressure
openaire +1 more source
Eigen‐Swarm: Swarm's Thermospheric Mass Density Modeling via Eigen‐Decomposition
Space Weather, Volume 23, Issue 7, July 2025.Abstract Precise thermospheric mass density (TMD) prediction is essential for satellite orbital tracking, reentry calculations, and upper atmospheric processes under varying solar and magnetospheric conditions. In this paper, we construct an empirical model of TMD at 450 km altitude with accelerometer‐derived (ACC) TMD observations from the Swarm‐C ...
Charles Owolabi +6 more
wiley +1 more source
Calcium Bright Knots and the Formation of Chromospheric Anemone Jets on the Sun
The Astrophysical Journal LettersSpace-based observations show that the solar atmosphere from the solar chromosphere to the solar corona is filled with small-scale jets and is linked with small-scale explosions.
Kunwar Alkendra Pratap Singh +2 more
doaj +1 more source
Multi‐Source Forecast of Solar Cycle Flare Activity Using the Novel Informer‐Based Models
Space Weather, Volume 23, Issue 4, April 2025.Abstract Solar flares, the significant indicators of solar activity, have an impact on Earth's satellites and communication systems. Accurate prediction of solar flare events is crucial for mitigating these effects. In this work, we use multiple data sources, including Geostationary Operational Environmental Satellites soft X‐ray flare flux and the ...
Jie Cao +11 more
wiley +1 more source