نتایج جستجو برای: sun oscillations
تعداد نتایج: 82031 فیلتر نتایج به سال:
We examine oscillations in a number of sums arithmetic functions involving [Formula: see text], the total prime factors and distinct text]. In particular, we text] for show example that each inequalities is true infinitely often, disproving some hypotheses Sun.
Despite numerous attempts and many hours of telescope time, there has so far been no confirmed detection of solar-like oscillations in any star except the Sun. We review recent efforts, with particular emphasis on the technique of monitoring equivalent widths of Balmer lines and the steps in data reduction.
The interior of the Sun is filled acoustic waves with periods of about 5 min. These waves, called "p modes," are understood to be excited by convection in a thin layer beneath the Sun's surface. The p modes cause seismic ripples, which we call "the solar oscillations." Helioseismic observatories use Doppler observations to map these oscillations, both spatially and temporally. The p modes propa...
The goal of this research is to investigate how well various turbulence models can describe physical properties of the upper convective boundary layer of the Sun. An accurate modeling of the turbulence motions is necessary for understanding the excitation mechanisms of solar oscillation modes. We have carried out realistic numerical simulations using several different physical Large Eddy Simula...
Waves connect all the layers of the Sun, from its interior to the upper atmosphere. It is becoming clear now the important role of magnetic field on the wave propagation. Magnetic field modifies propagation speed of waves, thus affecting the conclusions of helioseismological studies. It can change the direction of the wave propagation, help channeling them straight up to the corona, extending t...
The hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements of mono-radionuclide sources were performed over periods from 200 days up to four decades at 14 laboratories across the globe. Residuals from the exponential nuclear decay curves were inspected for annual oscillations. Systematic deviations...
The evolution of the solar interior is actively studied theoretically, numerically, and observationally. Many recent advancements in our understanding of the structure and dynamics of the sun have been made by studying solar oscillation. This is the science of helioseismology. Through groundand satellite-based telescopes, oscillations on the solar surface are being observed and, through appropr...
We present some new criteria for the oscillation of even order dynamic equation[Formula: see text]on time scale T, where α is the ratio of positive odd integers a and q is a real valued positive rd-continuous functions defined on T.
In December 2002, the Japan-based Kamioka Liquid scintillator Anti Neutrino Detector (KamLAND) collaboration announced that its measured rate of antineutrino fluxes from fission reactions in nuclear reactors was smaller than theoretically expected. In September 2003, The Canada-based Sudbury Neutrino Observatory (SNO) collaboration released its latest data on neutrinos from the sun. They conclu...
It is of great importance to monitor large solar active regions in the far-side of the Sun for space weather forecast, in particular, to predict their appearance before they rotate into our view from the solar east limb. Local helioseismology techniques, including helioseismic holography and time-distance, have successfully imaged solar far-side active regions. In this Letter, we further explor...
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