Results 151 to 160 of about 285 (167)

The Solar Chromosphere and Corona: Quiet Sun

Astrophysics and Space Science Library, 1975
R Grant Athay
exaly   +2 more sources

Phase Relation of the Quiet Chromosphere in the He I Line With the Solar Cycle

Advances in Space Research, 2022
K J Li
exaly   +2 more sources

Velocity waves in the quiet solar chromosphere

Solar Physics, 1976
Propagation of velocity waves are investigated in the solar chromosphere, with a special view to high frequencies (periods ≥ 60 s). Four line profiles have been observed during 27 mn with the Sacramento Peak vacuum telescope (Hα, 3933, 8498 and 8542 Ca ii). Three Fourier analysis are performed according to the location in the cells of the chromospheric
Nicole Mein, Pierre Mein
openaire   +1 more source

The hydrogen balmer lines and the structure of the quiet solar chromosphere

Solar Physics, 1975
Spectra of Hα, Hβ and Hδ have been taken under good seeing conditions with the vacuum tower telescope of Sacramento Peak Observatory. Intensity curves are given at various wavelengths in these lines to permit further comparison with a theoretical model.
Pierre Mein, Nicole Mein
openaire   +1 more source

The Solar Quiet Chromosphere-Corona Transition Region

Space Science Reviews, 1998
The chromosphere-corona transition region of the Sun enjoys both simplicities of character and complexities of character which result from its very thin geometrical extent. The simplicities derive from the reasonably clear view of the energy balance (both observationally and theoretically), while the complexities derive from both the proximity of the ...
openaire   +1 more source

Plasma flows in the quiet solar chromosphere-corona transition region

Moscow University Physics Bulletin, 2015
This article is devoted to solving the problem of the plasma temperature distribution along a magnetic tube, one end of which is in the chromosphere, while the other is in the corona. The plasma temperature dependences of the density, pressure, and velocity of plasma are determined for various velocities of the plasma flow, which are given at the lower
O. V. Dunin-Barkovskaya, B. V. Somov
openaire   +1 more source

Wave propagation in the quiet solar chromosphere

Solar Physics, 1977
In order to precise previous results about wave propagation in the quiet chromosphere (N. Mein and P. Mein, 1976), we study the behaviour of Doppler shifts and intensity fluctuations in 3 lines of Ca ii.
openaire   +1 more source

Source functions and profiles of λλ4571, 5173 Mg I lines in chromosphere models of quiet Sun, solar flares and T tauri stars

Astronomical & Astrophysical Transactions, 1997
Abstract The formation conditions of the λλ4571, 5173 Mg I lines in the atmospheres of quiet Sun, solar flares and T Tauri stars (TTS) are considered. It has been found that the line λ4571 is formed in local thermodynamic equilibrium (LTE) conditions only in the quiet Sun. In the case of the more dense atmospheres of solar flares and TTS the line λ4571
U. Sh. Bayazitov, I. Kh. Saghidullin
openaire   +1 more source

Pole-Equator-Difference of the Size of the Chromospheric Ca II ’ K ’ Network in Quiet and Active Solar Regions

1989
The dependence of the size of chromospheric network cells on latitude was investigated for quiet and active solar regions. Calibrated photographic Ca II K — filtergrams were taken at the Schauinsland observatory of the Kiepenheuer-Institut during the period 1982 until 1984.
H. Münzer, A. Hanslmeier, E. H. Schröter, H. Wöhl   +3 more
openaire   +1 more source

The Solar Chromosphere and Corona: Quiet Sun

Physics Today, 1976
R. G. Athay, Jacques M. Beckers
openaire   +1 more source