Results 111 to 120 of about 14,709 (209)

Accelerated particle beams in a 3D simulation of the quiet Sun

, 2020
Observational and theoretical evidence suggest that beams of accelerated particles are produced in flaring events of all sizes in the solar atmosphere, from X-class flares to nanoflares.
Bakke, H., Frogner, L., Gudiksen, B. V.
core   +1 more source

A Comparison of MAVEN SIR Observations With the Stationary WSA‐ENLIL Solar Wind Model

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract Predicting times of arrival and properties of space weather events, such as coronal mass ejections and stream interaction regions (SIRs), has become an important focus of the space physics community within recent years. Extensive efforts have been undertaken to model these space weather events throughout the heliosphere in order to better ...
Sarah Henderson, Rachael Filwett, Sophia Owen, Jasper Halekas, Jacob Gruesbeck   +4 more
wiley   +1 more source

Thread Displacement and Intensity Oscillations in a Quiescent Prominence

The Astrophysical Journal
In this paper, we investigate the thread displacement and intensity oscillations in a quiescent prominence observed by New Vacuum Solar Telescope at the H α line center on 2019 October 31.
Yuxiang Song, Zongjun Ning, Dong Li, Fanpeng Shi, Jun Xu, Yuzhi Yang   +5 more
doaj   +1 more source

STEREO REleASE+: Adding Robustness to Solar Proton Event Forecasting in the Heliosphere by Means of Automated Recognition of Type‐III Radio Bursts

Space Weather, Volume 23, Issue 12, December 2025.
Abstract This work reports on the real‐time implementation of a local solar proton event forecasting system at the Solar Terrestrial Relations Observatory—Ahead (STEREO‐A) spacecraft, namely STEREO REleASE+. The forecasting uses the finding that relativistic electrons provide the “earliest indication” that a solar particle event has started, arriving ...
Arik Posner, Olga Ε. Malandraki, Kostas Tziotziou, Michalis Karavolos, Henrik Dröge, Bernd Heber, Patrick Kühl, Lefteris Tsipis   +7 more
wiley   +1 more source

Coronal Cells in Coronal Holes: Systematic Analysis and Implications for Coronal Evolution

The Astrophysical Journal
Using advanced processing techniques, we analyze high-cadence, high-resolution extreme-ultraviolet images and show that, throughout the solar cycle, midlatitude coronal holes (CHs) are made up of ubiquitous and space-filling funnel-shaped structures (or ...
Nathalia Alzate, Simone Di Matteo, Aleida Higginson   +2 more
doaj   +1 more source

Is There a High‐Energy Particle Population in the Quiet Solar Corona?

The Astrophysical Journal, 2007
A study of spectra emitted by the quiet solar corona indicates that the majority of line intensities originating in low-lying levels are consistent with isothermal plasma of ~1.3 × 106 K. Nevertheless, a number of line intensities and, in particular, those belonging to ions that are typical of higher temperatures are brighter than expected.
Yu. Ralchenko, U. Feldman, G. A. Doschek
openaire   +1 more source

Periodic Variations in Visible Light Brightness as Tracers of Fine Coronal Structures

The Astrophysical Journal
The quiescent or dynamic nature of fine-scale raylike features in the Sun corona, observed in visible light, is still an open question. Here, we show that most of the daily and hourly periodic variations in visible light brightness of the high corona (up
Nathalia Alzate, Simone Di Matteo
doaj   +1 more source

Recent Advances in Chromospheric and Coronal Polarization Diagnostics

, 2009
I review some recent advances in methods to diagnose polarized radiation with which we may hope to explore the magnetism of the solar chromosphere and corona.
A Asensio Ramos, A Lagg, A Lagg, A Lagg, A López Ariste, A López Ariste, A Pietarila, E Landi Degl’Innocenti, E Landi Degl’Innocenti, F Paletou, H Socas-Navarro, H. Socas‐Navarro, H. Socas‐Navarro, J Trujillo Bueno, J Trujillo Bueno, J Trujillo Bueno, J Trujillo Bueno, J Trujillo Bueno, J Trujillo Bueno, JO Stenflo, L Belluzzi, L Merenda, M Sampoorna, P Charbonneau, PG Judge, R Casini, R Casini, R Casini, R Casini, R Centeno, R Centeno, R Holzreuter, R Manso Sainz, S Tomczyk, SK Solanki, V Bommier   +35 more
core   +1 more source

Turbulent Suppression of Alfvénic Wave Resonances in Coronal Loops

The Astrophysical Journal
Alfvénic wave turbulence is a leading mechanism for explaining the heating of the solar corona and the acceleration of the solar wind. Alfvénic waves are observed to be prevalent throughout the inner corona.
Edris Tajfirouze, Richard Morton, Mahboubeh Asgari-Targhi   +2 more
doaj   +1 more source

THE EFFECT OF TURBULENCE INTERMITTENCE ON THE EMISSION OF SOLAR ENERGETIC PARTICLES BY CORONAL AND INTERPLANETARY SHOCKS [PDF]

Major solar energetic particle events are associated with shock waves in solar corona and solar wind. Fast scattering of charged particles by plasma turbulence near the shock wave increases the efficiency of the particle acceleration in the shock, but ...
Kocharov, Leon, Laitinen, Timo Lauri Mikael, Vainio, Rami   +2 more
core   +1 more source