Results 61 to 70 of about 881 (218)

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, Denny M. Oliveira, Theodosios Chatzistergos, Gangkai Poh, Eftyhia Zesta   +4 more
wiley   +1 more source

Chromospheric heating by magnetohydrodynamic waves and instabilities

, 2021
The importance of the chromosphere in the mass and energy transport within the solar atmosphere is now widely recognised. This review discusses the physics of magnetohydrodynamic (MHD) waves and instabilities in large-scale chromospheric structures as ...
Srivastava, Abhishek Kumar, Jess, D. B.; id_orcid, Jess, D.B., Jess, David B., M. Goossens, Cally, P S, A. K. Srivastava, P. S. Cally, D. B. Jess, Murawski, K., Ballester, J.L., Carlsson, Mats, Ballester, Jose Luis, Khomenko, Elena, Murawski, Kris, Zaqarashvili, T.V., M. Carlsson, Cally, P.S., Goossens, M, Mathioudakis, M., Ballester, J L, M. Mathioudakis, Carlsson, M, Khomenko, E., Zaqarashvili, T V, J. L. Ballester, E. Khomenko, Srivastava, A.K., Srivastava, A K, K. Murawski, Goossens, M., Khomenko, E, Cally, Paul Stuart, Mathioudakis, Mihalis, Carlsson, M., T. V. Zaqarashvili, Murawski, K, Zaqarashvili, Teimuraz   +37 more
core   +1 more source

A New Method for Probabilistic Spatiotemporal Forecasts of Solar Soft X‐Ray “S‐Class” (>X10) Superflares

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, G. Velasco Herrera, W. Soon, A. Özgüç, N. Babynets, A. Tlatov, M. Švanda, S. Qiu, S. Baliunas, B. Kotan, G. González González, L. A. Bautista Flores, M. Pazos   +12 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., Reardon, K., Rutten, R.J., Tritschler, A., Uitenbroek, H.   +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, R. H. Cameron, S. K. Solanki   +2 more
openaire   +3 more sources

Response of Ionospheric Total Electron Content to the Impulsive and Late Phases of X‐Class Solar Flares With Various Center‐to‐Limb Locations

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, R. O. Milligan, I. A. Ryakhovsky   +2 more
wiley   +1 more source

Coronal Heating and Solar Wind Generation by Flux Cancellation Reconnection

The Astrophysical Journal, 2023
In this paper, we propose that flux cancellation on small granular scales (≲1000 km) ubiquitously drives reconnection at a multitude of sites in the low solar atmosphere, contributing to chromospheric/coronal heating and the generation of the solar wind.
D. I. Pontin, E. R. Priest, L. P. Chitta, V. S. Titov   +3 more
doaj   +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, Hyunju Connor, Don Hampton, Denny M. Oliveira, Andres Calabia, V. Sai Gowtam, Eftyhia Zesta   +6 more
wiley   +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, Tingting Xu, Linhua Deng, Miao Wan, Xinhua Zhao, Yang Peng, Xueliang Zhou, Wenhua Wang, Lidong Huang, Wencheng Wang, Lei Yang, Weihong Zhou   +11 more
wiley   +1 more source

Magnetic Fields and Plasma Heating in the Sun’s Atmosphere

The Astrophysical Journal
We 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, L. Kleint, R. Casini, A. G. de Wijn, T. Schad, A. Tritschler   +5 more
doaj   +1 more source