Results 61 to 70 of about 14,496 (257)

Observations of small-scale energetic events in the solar transition region: explosive events, UV bursts, and network jets

Solar-Terrestrial Physics, 2019
In this paper, we review observational aspects of three common small-scale energetic events in the solar transition region (TR), namely TR explosive events, ultraviolet bursts and jets.
Zhenghua Huang, Bo Li, Lidong Xia
doaj   +1 more source

Structure of the Solar Atmosphere: A Radio Perspective

Frontiers in Astronomy and Space Sciences, 2020
Solar radio emission has been providing information about the Sun for over half a century. In order to fully exploit this information, one needs to have a broader view of the solar atmosphere, which cannot be provided by radio observations alone.
Costas E. Alissandrakis
doaj   +1 more source

Formation of the Lyman Continuum during Solar Flares

The Astrophysical Journal, 2023
The Lyman continuum (LyC;
Shaun A. McLaughlin, Ryan O. Milligan, Graham S. Kerr, Aaron J. Monson, Paulo J. A. Simões, Mihalis Mathioudakis   +5 more
doaj   +1 more source

On the Origin of the Slow Speed Solar Wind: Helium Abundance Variations

, 2012
The First Ionization Potential (FIP) effect is the by now well known enhancement in abundance over photospheric values of Fe and other elements with first ionization potential below about 10 eV observed in the solar corona and slow speed solar wind.
Antiochos, Avrett, Bourouaine, Bruno, Bryans, Byhring, Campos, Cara E. Rakowski, Cranmer, Cranmer, Feldman, Heggland, J. Martin Laming, Kasper, Kigure, Killie, Ko, Laming, Laming, Laming, Laming, Laming, Litwin, Longcope, Noci, Ofman, Ofman, Parker, Parker, Rappazzo, Rappazzo, Ruderman, Schwadron, Sturrock, Verdini, Wang, Wang, Wood   +37 more
core   +1 more source

Atmosphere above a large solar pore [PDF]

, 2013
A large solar pore with a granular light bridge was observed on October 15, 2008 with the IBIS spectrometer at the Dunn Solar Telescope and a 69-min long time series of spectral scans in the lines Ca II 854.2 nm and Fe I 617.3 nm was obtained.
Del Moro, D., Heinzel, P., Jurcak, J., Sobotka, M., Svanda, M.   +4 more
core   +2 more sources

On the Freeze‐In Distance of Solar Wind Fluid Entropy Variability in the Corona

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract The strong correlation between solar wind entropy and the frozen‐in ion charge state ratio O7+/O6+ ${\mathrm{O}}^{7+}/{\mathrm{O}}^{6+}$ indicates that entropy variability on timescales of hours or longer is preserved from its solar source. This prompts the question: where in the solar atmosphere does this entropy variability come from, and at
Aidan J. Nakhleh, Nicholeen M. Viall, Susan T. Lepri, Jim M. Raines   +3 more
wiley   +1 more source

Numerical simulation of the three-dimensional structure and dynamics of the non-magnetic solar chromosphere

, 2003
Three-dimensional numerical simulations with CO5BOLD, a new radiation hydrodynamics code, result in a dynamic, thermally bifurcated model of the non-magnetic chromosphere of the quiet Sun.
Freytag, Bernd, Holweger, Hartmut, Ludwig, Hans-Günter, Steffen, Matthias, Wedemeyer, Sven   +4 more
core   +1 more source

Solar Activity Impacts on Ionospheric Scintillation and Precise Point Positioning Based on Multi‐Year GNSS and Scintillation Observations

Space Weather, Volume 24, Issue 3, March 2026.
Abstract Solar activity induces ionospheric irregularities that degrade Global Navigation Satellite System (GNSS) performance through amplitude and phase scintillation. Although numerous studies have investigated event‐driven or regional responses, the nonlinear coupling between solar radiation, ionospheric scintillation, and precise point positioning (
Jincheng Li, Qi Liu, Xiaomin Luo, Manuel Hernández‐Pajares, Enric Monte‐Moreno, Guangxia Wang, Heng Yang, Chuanding Zhang, Li Yang, Yaoyao Liu   +9 more
wiley   +1 more source

Effect of Magnetic Diffusion in the Chromosphere on the Solar Wind

The Astrophysical Journal
We investigate nonideal magnetohydrodynamical (MHD) effects in the chromosphere on the solar wind by performing MHD simulations for Alfvén-wave-driven winds, explicitly including ohmic and ambipolar diffusion.
Masato Matsuoka, Takeru K. Suzuki, Takato Tokuno, Kensuke Kakiuchi   +3 more
doaj   +1 more source

The chromosphere and prominence magnetometer

, 2012
The Chromosphere and Prominence Magnetometer (ChroMag) is conceived with the goal of quantifying the intertwined dynamics and magnetism of the solar chromosphere and in prominences through imaging spectro-polarimetry of the full solar disk.
Bethge, Christian, de Wijn, Alfred G., McIntosh, Scott, Tomczyk, Steven   +3 more
core   +1 more source