Results 101 to 110 of about 332 (133)
Some of the next articles are maybe not open access.
Electrical Conductivity of the Lower Chromosphere of the Sun
Publications of the Astronomical Society of Japan, 1955Abstract 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
The EUV chromospheric network in the quiet Sun
Solar Physics, 1976Investigations 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
ChroTel: a robotic telescope to observe the chromosphere of the Sun
SPIE Proceedings, 2008The Chromospheric Telescope (ChroTel) is a 10 cm robotic telescope to observe the full solar disk with a 2k × 2k CCD at high temporal cadence. It is located at the Observatorio del Teide, Tenerife, Spain, next to the 70 cm German Vacuum Tower Telescope (VTT).
T. J. Kentischer +9 more
openaire +1 more source
Flow of Material at the Chromosphere-Corona Transition Zone of the Sun
Space Science Reviews, 1982Early models of the Chromosphere-Corona transition zone of the Sun considered it to be a static plane-parallel region. From these it became clear that the layer was extremely thin and had an important role in the conduction of energy from the Corona. More recent observations show mass motions of order 10 km s -1, which means that heating and cooling of
openaire +1 more source
Observations of longperiod mass velocity oscillations in the Sun's chromosphere
Solar Physics, 1987Observations 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 +2 more
openaire +1 more source
3D MHD modelling of a chromosphere above the sun's convective zone
Proceedings of the International Astronomical Union, 2010AbstractWe 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
Red shift of spectral lines in the Sun's chromosphere
IEEE Transactions on Plasma Science, 1989An 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
A comparison of photospheric, chromospheric and coronal indices for the sun
Advances in Space Research, 1986Abstract Indices of photospheric activity as reconstructed sunspot blocking (essentially sunspot areas) are compared with the White and Livingston 1A Ca II K index and a polarization-brightness index of the corona that is proportional to mean hemispheric coronal electron density.
openaire +1 more source
Differential rotation: the chromosphere to the quiet chromosphere
Monthly Notices of the Royal Astronomical Society, 2023J L Xie
exaly
Spicules and downflows in the solar chromosphere
Astronomy and Astrophysics, 2021Vasco Henriques, Jayant Joshi
exaly