Results 101 to 110 of about 14,687 (203)
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
Thread Displacement and Intensity Oscillations in a Quiescent Prominence
The Astrophysical JournalIn 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 +5 more
doaj +1 more source
Space Weather, Volume 23, Issue 10, October 2025.Abstract Using observations from the National Space Weather Laboratory's (LANCE acronym in Spanish) ground‐based network, we characterize regional space weather conditions in Mexico during the solar minimum 24/25 (2018–2020). Data analyzed include regional geomagnetic indices (the regional K index, Kmex, and Δ ${\Delta }$H), ionospheric Total Electron ...
J. A. Gonzalez‐Esparza +6 more
wiley +1 more source
Coronal Cells in Coronal Holes: Systematic Analysis and Implications for Coronal Evolution
The Astrophysical JournalUsing 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 +2 more
doaj +1 more source
Periodic Variations in Visible Light Brightness as Tracers of Fine Coronal Structures
The Astrophysical JournalThe 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 +35 more
core +1 more source
Turbulent Suppression of Alfvénic Wave Resonances in Coronal Loops
The Astrophysical JournalAlfvénic 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 +2 more
doaj +1 more source
Connecting the Low to High Corona: Propagating Disturbances as Tracers of the Near-Sun Solar Wind
The Astrophysical JournalWe revisit a quiet 14 day period of solar minimum during 2008 January and track substreamer propagating disturbances (PDs) from low heights in STEREO/EUVI to the extended corona through STEREO/COR1 and into STEREO/COR2 along nonradial paths that trace ...
Nathalia Alzate +4 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 +2 more
core +1 more source
The Astrophysical Journal, 2022 Abstract The reconstruction of the differential emission measure (DEM) from observations of spectral line intensities provides information on the temperature distribution of the emission measure in the region observed. The inversion process is known to be highly unstable, and it has been necessary to provide additional constraints, such ...
openaire +2 more sources