Results 101 to 110 of about 1,568 (212)

Persistent Near-Surface Flow Structures from Local Helioseismology [PDF]

, 2015
Near-surface flows measured by the ring-diagram technique of local helioseismology show structures that persist over multiple rotations. We examine these phenomena using data from the Global Oscillation Network Group (GONG) and the Helioseismic and ...
Komm, R. W., Van Driel Gesztelyi, Lídia, Bogart, R., Bogart, R. S., Bogart, RS, Howe, R, Baker, D., Baker, D, Komm, R., van Driel-Gesztelyi, L, Howe, Rachel, Harra, L., Van Driel-Gesztelyi, L., Howe, R., Harra, L, Komm, RW   +15 more
core   +1 more source

Stray Light Correction for the Helioseismic and Magnetic Imager

The Astrophysical Journal Supplement Series
We report a point-spread function (PSF) and deconvolution procedure to remove stray light from the Helioseismic and Magnetic Imager (HMI) data. Prelaunch calibration observations, postlaunch Venus transit, and lunar transit data were used to develop the ...
A. A. Norton, T. L. Duvall Jr., J. Schou, R. S. Bogart, Junwei Zhao, M. C. Rabello-Soares, P. J. Levens, J. T. Hoeksema, C. S. Baldner   +8 more
doaj   +1 more source

New Solar Metallicity Measurements

Atoms, 2019
In the past years, a systematic downward revision of the metallicity of the Sun has led to the “solar modeling problem„, namely the disagreement between predictions of standard solar models and inferences from helioseismology.
Sunny Vagnozzi
doaj   +1 more source

Dynamics of Large-Scale Solar Flows. [PDF]

Space Sci Rev, 2023
Hotta H, Bekki Y, Gizon L, Noraz Q, Rast M.   +4 more
europepmc   +1 more source

Helioseismology – from oscillations toward the internal structure

, 2009
Solar oscillations make it possible to construct a detailed model od the Sun and to map details of the solar interior.
Švanda, Michal
core  

Determining solar abundances using helioseismology

, 2006
The recent downward revision of solar photospheric abundances of oxygen and other heavy elements has resulted in serious discrepancies between solar models and solar structure as determined through helioseismology.
Basu, Sarbani, Antia, H. M.
core   +1 more source

Computational aspects of Green's kernels in local helioseismology.

International audienceHelioseismology infers the interior of the Sun from oscillations which are continuously excited by near-surface turbulent convection and observed in the photosphere.
Gizon, Laurent,, Pham, Ha, Barucq, Hélène, Fournier, Damien, Faucher, Florian   +4 more
core   +5 more sources

Neutrino Helioseismology

, 1992
The observed deficit of $\rm ^8B$ solar neutrinos may call for an improved standard model of the sun or an expanded standard model of particle physics ({\it e.g.,} with neutrino masses and mixing). In the former case, contemporary fluid motions and thermal fluctuations in the sun's core may modify nuclear reaction rates and restore agreement.
De Rújula, A., Glashow, S. L.
openaire   +2 more sources

The New Era in Helioseismology [PDF]

Symposium - International Astronomical Union, 2001
The end of the millennium marks the beginning of the third phase of helioseismology. The first phase was the establishment of the initial astronomical inferences, such as estimates of the depth of the solar convection zone and the protosolar helium abundance, obtained by comparing the seismic properties of theoretical solar models with the first wave ...
openaire   +1 more source

Effects of Dynamo-generated Large-scale Magnetic Fields on the Surface Gravity (f) Mode

The Astrophysical Journal Letters
By modeling the upper layers of the Sun in terms of a two-layer setup where a free surface exists within the computational domain, we numerically study the interaction between the surface gravity, or the fundamental ( f ) mode, and the magnetic fields ...
Rajesh Mondal, Nishant K. Singh
doaj   +1 more source