Results 81 to 90 of about 14,709 (209)

Estimating the contribution of Alfvén waves to the process of heating the quiet solar corona [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
We solve numerically the ideal MHD equations with an external gravitational field in 2D in order to study the effects of impulsively generated linear and non-linear Alfv n waves into isolated solar arcades and coronal funnels. We analyze the region containing the interface between the photosphere and the corona.
Gonzalez-Aviles, J. J., Guzman, F. S.
openaire   +2 more sources

The quiet Sun average Doppler shift of coronal lines up to 2 MK [PDF]

, 2011
The average Doppler shift shown by spectral lines formed from the chromosphere to the corona reveals important information on the mass and energy balance of the solar atmosphere, providing an important observational constraint to any models of the solar ...
Achour, Athay, Athay, Ayres, Brekke, Brekke, Chae, Cheng, Culhane, Dammasch, Danilovic, De Pontieu, De Pontieu, Delaboudinière, Domínguez Cerdeña, Doschek, Edlén, Hansteen, Hansteen, Hansteen, Hara, Hassler, Judge, Korendyke, L. Teriaca, Laming, Lemaire, Mariska, Marsch, McIntosh, McIntosh, N. Dadashi, Pagano, Peter, Peter, Peter, Peter, Peter, Pneuman, S. K. Solanki, Samain, Spadaro, Teriaca, Teriaca, Teriaca, Tian, Trujillo Bueno, Tu, Wilhelm, Withbroe, Wood   +50 more
core   +1 more source

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

Thermal structuring of the quiet solar corona

Astronomy & Astrophysics
Context. The quiet solar atmosphere is populated with plasma loops that are typically observed in the ultraviolet (UV) and extreme-ultraviolet (EUV) wavelengths. The coronal counterparts of these loops are traditionally referred to as coronal bright points.
N. Milanović, H. Peter, L. P. Chitta, P. R. Young   +3 more
openaire   +1 more source

How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?

The Astrophysical Journal
The corona is a structure possessed by stars, including the Sun. The abnormal heating of the solar corona and chromosphere is one of the greatest mysteries in modern astronomy.
K. J. Li, J. C. Xu, W. Feng, J. L. Xie, X. J. Shi, L. H. Deng   +5 more
doaj   +1 more source

Deciphering the birth region, formation, and evolution of ambient and transient solar wind using heavy ion observations

Frontiers in Astronomy and Space Sciences, 2022
This paper outlines key scientific topics that are important for the development of solar system physics and how observations of heavy ion composition can address them.
Yeimy. J. Rivera, Aleida Higginson, Susan T. Lepri, Nicholeen M. Viall, B. L. Alterman, Enrico Landi, Sarah A. Spitzer, Jim M. Raines, Steven R. Cranmer, John M. Laming, Emily I. Mason, Samantha Wallace, John C. Raymond, Benjamin J. Lynch, Chris R. Gilly, Thomas Y. Chen, Ryan M. Dewey   +16 more
doaj   +1 more source

Surface Alfven Wave Damping in a 3D Simulation of the Solar Wind

, 2009
Here we investigate the contribution of surface Alfven wave damping to the heating of the solar wind in minima conditions. These waves are present in regions of strong inhomogeneities in density or magnetic field (e.
Cohen, Cranmer, Cranmer, De Pontieu, Esser, Evans, Hasegawa, Heyvaerts, Jatenco-Pereira, Kohl, Lionello, M. Opher, Matthaeus, Matthaeus, Parker, Patsourakos, R. M. Evans, Roussev, Suzuki, T. I. Gombosi, Tomczyk, V. Jatenco-Pereira, Verdini   +22 more
core   +1 more source

Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode) [PDF]

, 2008
Twisting motions of different nature are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are examples of the large scale twisted topology of many ...
Berger, Bonet, Brandt, D. E. Innes, H. E. Potts, Krijger, Meunier, Potts, Potts, R. Attie, Rieutord, Roudier, Shine, Wang, Welsch, Zirker   +15 more
core   +1 more source

Evaluating the OMNI Database: Statistical Analysis of Time‐Shifted L1 Data Versus Direct Near‐Earth Solar Wind Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract This study presents a comprehensive statistical comparison of solar wind measurements between the OMNI database which contains data collected at L1 that is shifted to the bow shock nose, and near‐Earth observations from MMS, Cluster, and THEMIS missions near the bow shock nose.
G. H. Blüthner, M. Volwerk, D. Schmid, R. Nakamura, M. Temmer, O. W. Roberts, F. Koller, A. Varsani   +7 more
wiley   +1 more source

On the Million-degree Signature of Spicules

The Astrophysical Journal Letters
Spicules have often been proposed as substantial contributors toward the mass and energy balance of the solar corona. While their transition region (TR) counterpart has unequivocally been established over the past decade, the observations concerning the ...
Souvik Bose, Jayant Joshi, Paola Testa, Bart De Pontieu   +3 more
doaj   +1 more source