Results 51 to 60 of about 1,559,234 (209)
Spatio-temporal analysis of chromospheric heating in a plage region
, 2022 Context. Our knowledge of the heating mechanisms that are at work in the chromosphere of plage regions remains highly unconstrained from observational studies.
de la Cruz Rodríguez, Jaime, +7 more
core +1 more source
Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.Abstract Recent studies have demonstrated that warm coronal emissions during the extreme ultraviolet late phase (ELP) of X‐class solar flares can be sufficiently strong to also affect electron density in the Earth's ionosphere. The Fe XV 28.4 nm line was identified as one of the most geoeffective emissions produced during the ELP.
S. Z. Bekker +8 more
wiley +1 more source
The solar chromosphere at high resolution with IBIS [PDF]
Astronomy & Astrophysics, 2009 The structure and energy balance of the solar chromosphere remain poorly known. We have used the imaging spectrometer IBIS at the Dunn Solar Telescope to obtain fast-cadence, multi-wavelength profile sampling of Halpha and Ca II 854.2 nm over a sizable two-dimensional field of view encompassing quiet-Sun network. We provide a first inventory of how the
Cauzzi, G. +4 more
openaire +4 more sources
Simulations Show that Vortex Flows Could Heat the Chromosphere in Solar Plage [PDF]
The Astrophysical Journal Letters, 2020 Abstract The relationship between vortex flows at different spatial scales and their contribution to the energy balance in the chromosphere is not yet fully understood. We perform three-dimensional (3D) radiation-magnetohydrodynamic simulations of a unipolar solar plage region at a spatial resolution of 10 km using the MURaM code. We use
Nitin Yadav +2 more
openaire +3 more sources
Space Weather, Volume 24, Issue 6, June 2026.Abstract Ejections of magnetized plasma from the Sun, known as coronal mass ejections, can drive major geomagnetic activity if Earth‐directed, and are therefore monitored by space weather forecasters. The current focus being the forecast of the arrival time of a coronal mass ejection at Earth and the level of geomagnetic impact.
L. M. Green +7 more
wiley +1 more source
Multi‐Wavelength Transformer‐Based 24‐Hour Solar Flare Forecasting at the Active‐Region Level
Space Weather, Volume 24, Issue 6, June 2026.Abstract Solar flare forecasting remains challenging due to the complex spatiotemporal evolution of solar active regions (ARs) and the severe class imbalance associated with high‐impact events. In this work, we investigate a transformer‐based framework for active‐region–level solar flare forecasting using short sequences of multi‐wavelength ...
Dunia Alatoom, Nikos Nikolaou
wiley +1 more source
Magnetic Fields and Plasma Heating in the Sun’s Atmosphere
The Astrophysical JournalWe use the first publicly available data from the Daniel K. Inouye Solar Telescope to track magnetic connections from the solar photosphere into the corona.
P. Judge +5 more
doaj +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
Kink Instability of Flux Ropes in Partially Ionized Plasmas
The Astrophysical JournalIn the solar atmosphere, flux ropes are subject to current-driven instabilities that are crucial in driving plasma eruptions, ejections, and heating. A typical ideal magnetohydrodynamics instability developing in flux ropes is the helical kink, which ...
Giulia Murtas, Andrew Hillier, Ben Snow
doaj +1 more source
The Astrophysical Journal, 2023 Models fail to reproduce observations of the coldest parts of the Sun’s atmosphere, where interactions between multiple ionized and neutral species prevent an accurate MHD representation.
Samuel Evans +4 more
doaj +1 more source