Results 101 to 110 of about 318 (133)

The Problem of the Sun's Chromosphere

Nature, 1962
Physics of the Solar Chromosphere By Richard N. Thomas and R. Grant Athay. (Interscience Monographs and Texts in Physics and Astronomy, Vol. 6.) Pp. x + 422. (New York: Interscience Publishers, Inc.; London: Interscience Publishers, Ltd., 1961.) 15.50 dollars.
openaire   +1 more source

The EUV chromospheric network in the quiet Sun

Solar Physics, 1976
Investigations on the structure and intensity of the chromospheric network from quiet solar regions have been carried out with EUV data obtained with a spectroheliometer on the Apollo Telescope Mount of Skylab. The distribution of intensities within supergranulation cell interiors follows a near-normal function, where the standard deviation exceeds the
openaire   +1 more source

A comparison between photospheric and chromospheric quiet-Sun magnetograms

Solar Physics, 2000
Photospheric (Fe i λ5324.19 A line) and chromospheric (Hβ line) magnetic fields in quiet-Sun regions have been observed in the solar disk center by using the vector video magnetograph at Huairou Solar Observing Station of Beijing Astronomical Observatory.
Mei Zhang, Hongqi Zhang
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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 ...
openaire   +1 more source

Chromospheric Internetwork Oscillations at Various Locations of the Quiet Sun

Chinese Journal of Astronomy and Astrophysics, 2005
We analyze oscillation behaviours in chromospheric internetwork regions using spectral observations of the CII 1334 angstrom line obtained with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER) aboard Solar and Heliospheric Observatory (SOHO). Three areas, 26 x 120 arcsec(2) each, at the various latitudes from the disk center
Ning, Z., Ding, M.
openaire   +2 more sources

Observations of longperiod mass velocity oscillations in the Sun's chromosphere

Solar Physics, 1987
Observations made by the differential method in the Hβ line have revealed longperiod (on a timescale of 40 to 80 min) line-of-sight velocity oscillations which increase in amplitude with distance from the centre to the solar limb and, as we believe, give rise to prominence oscillations. As a test, we present some results of simultaneous observations at
V. S. Bashkirtsev, N. I. Kobanov, G. P. Mashnich   +2 more
openaire   +1 more source

A model of the inhomogeneous chromosphere of the sun

Solar Physics, 1967
A new model is proposed for the solar chromosphere, which is assumed to be an instable inhomogeneous formation, consisting of numerous elements (filaments), each with different temperature and density. Fluctuations of the magnetic field may give rise to chromospheric turbulence and may also cause the chromospheric inhomogeneities.
openaire   +1 more source

Electrical Conductivity of the Lower Chromosphere of the Sun

Publications of the Astronomical Society of Japan, 1955
Abstract The electrical conductivity of a ternary gas mixture including neutral atoms, ions and electrons is calculated to the second approximation by the method of Enskog-Chapman. The conductivity of the lower chromosphere is given numerically. The result indicates that the value of conductivity thus calculated is about half as large as
openaire   +1 more source