Results 171 to 180 of about 1,264 (196)

3D MHD modelling of a chromosphere above the sun's convective zone

Proceedings of the International Astronomical Union, 2010
AbstractWe report on the extension of the ASH code to include an atmospheric stable layer (i.e not convective). This layer is meant to model the sun's chromosphere within the anelastic approximation limits while coping with the wide range of densities, time and spatial scales between r = 0.7 R⊙ and r = 1.03 R⊙.
Pinto, R. & Brun, A.S.
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Observation of the chromospheric magnetic field of quiet-sun regions

Chinese Astronomy and Astrophysics, 2001
Abstract Using the solar magnetic field telescope at Huairou Station of Beijing Astronomical Observatory, the solar photospheric and chromospheric magnetic fields in quiet-sun regions were observed for the first time. From a study of deep magnetograms of the solar photosphere, chromosphere and different level of the chromosphere, it is found that the
Zhang Mei, Zhang Hong-qi
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Similarities between chromospheric and photospheric quiet-Sun magnetograms

Solar Physics, 2000
Simultaneous observations of chromospheric (Hβ) and photospheric (Fe i λ5324.19 A) magnetograms in quiet solar regions enable us to study the spatial configuration of the magnetic field in the solar atmosphere. With the typical spatial resolution of the Huairou magnetograph, the photospheric and chromospheric magnetic structures of the quiet Sun ...
Hongqi Zhang, Mei Zhang
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Red shift of spectral lines in the Sun's chromosphere

IEEE Transactions on Plasma Science, 1989
An unexplained center-to-limb variation (CLV) of solar wavelengths has been known for 75 years. A theory is described which not only explains this variation but also predicts its amplitude without the use of any adjustable parameter. The model considered is based on the fact that the momentum transfer of the solar photons to the electrons of the atoms ...
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Differential rotation: the chromosphere to the quiet chromosphere

Monthly Notices of the Royal Astronomical Society, 2023
J C Xu, X J Shi, N B Xiang
exaly  

The quiet chromosphere: Phase relation with the solar cycle

Advances in Space Research, 2022
K J Li
exaly  

Spicules and downflows in the solar chromosphere

Astronomy and Astrophysics, 2021
Souvik Bose, Jayant Joshi, Vasco M J Henriques   +2 more
exaly  

A Theoretical Model of the Solar Chromosphere over a Suns Pot

1982
The emission coefficient of the solar matter in the chromosphere has been calculated by Cox and Daltabuit (1971): $${\varepsilon _e} = {10^{ - 23}}f(T){n_e}{n_H}ergc{m^{ - 3}}{\sec ^{ - 1}},$$ (1) where f(T) is a numerically calculated function, ne and nH are the electron and the hydrogen densities.
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An optically thin view of the flaring chromosphere: non-thermal widths in a chromospheric condensation during an X-class solar flare

Monthly Notices of the Royal Astronomical Society, 2023
Graham S Kerr, Adam F Kowalski, Joel C Allred   +2 more
exaly  

Phase relation of the quiet chromosphere in the He I line with the solar cycle

Advances in Space Research, 2022
K J Li
exaly