Results 1 to 10 of about 871 (133)
Are Nonthermal Velocities in Active Region Coronal Loops Anisotropic?
The Astrophysical Journal, 2023 We have measured line widths in active region coronal loops in order to determine whether the nonthermal broadening is anisotropic with respect to the magnetic field direction. These nonthermal velocities are caused by unresolved fluid motions.
Michael Hahn +2 more
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Energy and Mass Transport Associated with Impulsive Spicular Flows in Solar Coronal Holes
The Astrophysical Journal LettersHow the solar atmosphere is heated from a temperature of about 5000 to 6000 K in the lower atmosphere to about 1–2 MK in the corona has challenged the astrophysical community for nearly 80 yr.
Lei Ni +5 more
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The Astrophysical Journal LettersThe variability of helium abundance in the solar corona and the solar wind is an important signature of solar activity, solar cycle, and solar wind sources, as well as coronal heating processes.
Leon Ofman, Yogesh, Silvio Giordano
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The Astrophysical JournalThe solar corona is much hotter than the photosphere and chromosphere, but the physical mechanism responsible for heating the coronal plasma remains unidentified. The thermal microwave emission, which is produced in a strong magnetic field above sunspots,
Alexey A. Kuznetsov +3 more
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Simulation of Thermal Nonequilibrium Cycles in the Solar Wind
The Astrophysical JournalThermal nonequilibrium (TNE) is a condition of the plasma in the solar corona in which the local rate of energy loss due to radiation increases to the point that it cannot be sustained by the various heating terms acting on the plasma, precluding the ...
Roger B. Scott +3 more
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Kinetic Physics of the Solar Corona and Solar Wind
Living Reviews in Solar Physics, 2006 Kinetic plasma physics of the solar corona and solar wind are reviewed with emphasis on the theoretical understanding of the in situ measurements of solar wind particles and waves, as well as on the remote-sensing observations of the solar corona made by
Marsch Eckart
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Modeling the Propagation of Slow Magnetoacoustic Waves in a Multistranded Coronal Loop
The Astrophysical JournalWe study the propagation properties of slow magnetoacoustic waves in a multithermal coronal loop using a 3D MHD model, for the first time. A bundle of 33 vertical cylinders, each of 100 km radius, randomly distributed over a circular region of radius 1 ...
S. Krishna Prasad, T. Van Doorsselaere
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Atmospheric Heating Events Associated with Fine-scale Flux Emergence in Ephemeral Regions
The Astrophysical JournalCoronal heating has puzzled solar physicists for decades. The question of why the Sun’s upper atmosphere is significantly hotter than its lower atmosphere remains a key mystery.
Hanlin Yang, Jingxiu Wang, Chunlan Jin
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Modeling multiphase plasma in the corona: prominences and rain
Living Reviews in Solar PhysicsWe review major achievements in our understanding of multiphase coronal plasma, where cool-dense and hot-tenuous matter coexists, brought about by advances in modeling and theory, inspired by observations.
Rony Keppens, Yuhao Zhou, Chun Xia
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How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?
The Astrophysical JournalThe 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 +5 more
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