Results 191 to 200 of about 3,875 (223)

Temperature variations in the solar photosphere

Solar Physics, 1974
From the variations in equivalent width of a selected set of Fraunhofer lines, we derived the variation of effective temperature and microturbulence velocity between the equator and the regions at heliographic latitude of ∼- 72°. The reliability of the results (ΔT/T = 0 ± 0.6%, Δξ/ξ = 6% ± 13%) needs further investigations, but from the analysis of our
R. Falciani, M. Rigutti, G. Roberti
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The potassium abundance in the solar photosphere

Solar Physics, 1975
High precision center-limb spectrograms of the K i resonance doublet line at λ 7699 A were used to study the line formation and to determine the abundance of potassium in the solar atmosphere. The LTE assumption is not valid for these lines. Synthetic profiles computed in NLTE reproduce very well the observed center-limb line behaviour and yield logɛ
Ramiro De La Reza, Edith A. Müller
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Temperature variations in the solar photosphere

Solar Physics, 1973
Detailed LTE calculations were made of the sensitivities of some Fraunhofer lines to local variations of the effective temperature of the Sun, taking also into account the effects of local variations of the microturbulence. The temperature sensitivities show a clear dependence upon the mean optical depth at which lines originate and upon the binding ...
B. Caccin, A. Donati-Falchi, R. Falciani
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Temperature fluctuations in the solar photosphere

Solar Physics, 1969
The general problem of interpreting granulation data, in particular Edmonds' r.m.s. intensity fluctuation distribution against heliocentric angle θ, is discussed.
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4.1.1.4 Solar photosphere and chromosphere

2009
Traditionally, the atmosphere of the Sun has been divided into four layers, starting with the photosphere at the bottom, followed by the chromosphere, the transition region, and the corona as the outermost region. The photosphere is a layer of only a few hundred kilometers thickness in which the temperature drops outwards from around 6000 K at the ...
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The photospheric solar oxygen project

2015
International ...
Caffau, E., Ludwig, H.-G., Steffen, M., Livingston, W., Bonifacio, P., Malherbe, J.-M., Doerr, H.-P., Schmidt, W.   +7 more
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Solar Photosphere

2004
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Solar photosphere

2011
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Granules of the Solar Photosphere

Scientific American, 1936
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On the distribution of magnetic null points above the solar photosphere

Physics of Plasmas, 2003
D W Longcope, D S Brown, E R Priest
exaly