Results 31 to 40 of about 6,507 (247)

Helioseismology and solar neutrinos: an update [PDF]

open access: yes, 2000
We review recent advances concerning helioseismology, solar models and solar neutrinos. Particularly we address the following points: i) helioseismic tests of recent SSMs; ii) predictions of the Beryllium neutrino flux based on helioseismology; iii ...
Adelberget   +27 more
core   +3 more sources

Progress in Global Helioseismology: A New Light on the Solar Modeling Problem and Its Implications for Solar-Like Stars

open access: yesFrontiers in Astronomy and Space Sciences, 2019
Since the first observations of solar oscillations in 1960, helioseismology has probably been one of the most successful fields of astrophysics.
Gaël Buldgen   +4 more
doaj   +1 more source

Effects of localized horizontal flow patterns on eigenfrequencies of stellar global modes [PDF]

open access: yesSerbian Astronomical Journal, 2005
The main goal of this paper is to estimate the significance of effects the flow profile U0(z) induces on computed global oscillation spectra. We solve numerically the eigenvalue problem for the described basic state configuration with reference to solar ...
Čadež V.M., Vanlommel P.
doaj   +1 more source

Deciphering Solar Magnetic Activity: On Grand Minima in Solar Activity

open access: yesFrontiers in Astronomy and Space Sciences, 2015
The Sun provides the energy necessary to sustain our existence. While the Sun provides for us, it is also capable of taking away. The weather and climatic scales of solar evolution and the Sun-Earth connection are not well understood.
Scott William Mcintosh, Robert J Leamon
doaj   +1 more source

Identifying Acoustic Wave Sources on the Sun. II. Improved Filter Techniques for Source Wavefield Seismology

open access: yesThe Astrophysical Journal, 2023
In this paper, we refine a previously developed acoustic source filter, improving its reliability and extending its capabilities. We demonstrate how to fine-tune the filter to meet observational constraints and focus on specific wave-front speeds.
Shah Mohammad Bahauddin, Mark Peter Rast
doaj   +1 more source

Waves from the Sun: to the 100th anniversary of V.A. Troitskaya’s birth

open access: yesSolar-Terrestrial Physics, 2017
It has been one hundred years since the birth of the outstanding scientist Professor V.A. Troitskaya. Her remarkable achievements in solar-terrestrial physics are widely known. For many years, Valeria A.
Guglielmi A.V., Potapov A.S.
doaj   +1 more source

Purely Gain-Coupled Distributed-Feedback Bragg Semiconductor Laser Diode Emitting at 770 nm

open access: yesApplied Sciences, 2021
The transition lines of Mg, K, Fe, Ni, and other atoms lie near 770 nm, therefore, this spectral region is important for helioseismology, solar atmospheric studies, the pumping of atomic clocks, and laser gyroscopes.
Chunkao Ruan   +9 more
doaj   +1 more source

Low abundances of heavy elements in the solar outer layers: comparisons of solar models with helioseismic inversions [PDF]

open access: yes, 2006
Recent solar photospheric abundance analyses have led to a significant reduction of the metal abundances compared to the previous determinations. The solar models computed with standard opacities and diffusion processes using these new abundances give ...
Alexander   +26 more
core   +4 more sources

An Iterative OLA Method for Inversion of Solar Spectropolarimetric Data. I. Single- and Multiple-variable Inversions of Thermodynamic Quantities

open access: yesThe Astrophysical Journal, 2023
This paper describes an adaptation of the Optimally Localized Averaging (OLA) inversion technique, originally developed for geo- and helioseismological applications, to the interpretation of solar spectroscopic data.
Piyush Agrawal   +2 more
doaj   +1 more source

Differential Rotation in Convecting Spherical Shells with Non-Uniform Viscosity and Entropy Diffusivity

open access: yesFluids, 2023
Contemporary three-dimensional physics-based simulations of the solar convection zone disagree with observations. They feature differential rotation substantially different from the true rotation inferred by solar helioseismology and exhibit a conveyor ...
Parag Gupta   +2 more
doaj   +1 more source

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