Results 91 to 100 of about 332 (133)

Biosynthesis of TiO₂ nano particles by using Rosemary (Rosmarinus officinalis) leaf extracts and its application for crystal dye degradation under sunlight. [PDF]

BMC Chem
Saka A, Jule LT, Badassa B, Gudata L, Nagaprasad N, Shanmugam R, Dwarampudi LP, Seenivasan V, Ramaswamy K.   +8 more
europepmc   +1 more source

Triangulation of Hard X-Ray Sources in an X-Class Solar Flare with ASO-S/HXI and Solar Orbiter/STIX. [PDF]

Sol Phys
Ryan DF, Massa P, Battaglia AF, Dickson ECM, Su Y, Chen W, Krucker S.   +6 more
europepmc   +1 more source

Butterfly Diagram and Other Properties of Plage Areas from Kodaikanal Ca ii K Photographs Covering 1904 - 2007. [PDF]

Sol Phys
Jha BK, Chatzistergos T, Banerjee D, Ermolli I, Krivova NA, Solanki SK, Priyadarshi A.   +6 more
europepmc   +1 more source

The quiet-Sun photosphere and chromosphere [PDF]

Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2012
Abstract The overall structure and the fine structure of the solar photosphere outside active regions are largely understood, except possibly the important roles of a turbulent near-surface dynamo at its bottom, internal gravity waves at its top and small-scale vorticity. Classical one-dimensional static radiation-escape modelling has
Robert J Rütten
exaly   +4 more sources

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Sounding the Sun's Chromosphere

The Astrophysical Journal, 1997
Time-distance analysis of solar acoustic waves with frequencies above the nominal atmospheric acoustic cutoff frequency (~5.3 mHz) shows partial reflection of the waves at both the Sun's photosphere and a layer located higher in the atmosphere. This result supports recent reports of chromospheric modes.
S. M. Jefferies, Y. Osaki, H. Shibahashi, J. W. Harvey, S. D'Silva, T. L. Duvall, Jr.   +5 more
openaire   +1 more source

Physical Processes in the Lower Chromosphere of the Sun

Plasma Physics Reports, 2020
A specificity of the boundary between the photosphere and the chromosphere of the Sun consists in considerable acceleration of plasma spicules above this boundary and appearance of wave motions (predominantly Alfven waves). Analytical solution to the equations of magnetic hydrodynamics is constructed in the vicinity of this boundary from the ...
I. A. Molotkov, N. A. Ryabova
openaire   +1 more source

Oxygen in the Sun's Chromosphere

Nature, 1935
PHOTOGRAPHS which I have taken at the Kodaikanal Observatory show that oxygen is a normal constituent of the sun's chromosphere, and is probably in great abundance.
openaire   +1 more source

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

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

Does the Sun Have a Full-Time Chromosphere?

The Astrophysical Journal, 1999
The successful modeling of the dynamics of H2v bright points in the nonmagnetic chromosphere by Carlsson & Stein gave as a by-product a part-time chromosphere lacking the persistent outward temperature increase of time-average empirical models, which is needed to explain observations of UV emission lines and continua.
Wolfgang Kalkofen, Peter Ulmschneider, Eugene H. Avrett   +2 more
openaire   +1 more source