Effect of asymmetry in peak profiles on solar oscillation frequencies
نویسنده
چکیده
Most helioseismic analyses are based on solar oscillations frequencies obtained by fitting symmetric peak profiles to the power spectra. However, it has now been demonstrated that the peaks are not symmetric. In this work we study the effects of asymmetry of the peak profiles on the solar oscillations frequencies of p-modes for low and intermediate degrees. We also investigate how the resulting shift in frequencies affects helioseismic inferences. Subject headings: Sun: oscillations; Sun: interior
منابع مشابه
Numerical Simulations of Oscillation Modes of the Solar Convection Zone.
We use the three-dimensional hydrodynamic code of Stein & Nordlund to realistically simulate the upper layers of the solar convection zone in order to study physical characteristics of solar oscillations. Our first result is that the properties of oscillation modes in the simulation closely match the observed properties. Recent observations from the Solar and Heliospheric Observatory (SOHO)/Mic...
متن کاملLine asymmetry of solar p-modes: Reversal of asymmetry in intensity power spectra
The sense of line asymmetry of solar p-modes in the intensity power spectra is observed to be opposite of that seen in the velocity power spectra. Theoretical calculations provide a good understanding and fit to the observed velocity power spectra whereas the reverse sense of asymmetry in the intensity power spectrum has been poorly understood. We show that when turbulent eddies arrive at the t...
متن کاملar X iv : a st ro - p h / 99 06 25 2 v 1 1 5 Ju n 19 99 Large scale flows in the solar interior : Effect of asymmetry in peak profiles
Ring diagram analysis can be used to study large scale velocity fields in the outer part of the solar convection zone. All previous works assume that the peak profiles in the solar oscillation power spectrum are symmetric. However, it has now been demonstrated that the peaks are not symmetric. In this work we study how the explicit use of asymmetric peak profiles in ring-diagram analysis influe...
متن کاملEffects of Line Asymmetries on the Determination of Solar Oscillation Frequencies
Despite the strong evidence that the peaks in the spectrum of solar oscillations are asymmetric, most determinations of mode frequencies have been based on ts of symmetric Lorentzian prooles to the Fourier or power spectra of oscillation time strings. The systematic errors resulting from neglecting the line asymmetry could have serious eeects on inversions for the solar internal structure and r...
متن کاملEffects of line asymmetries on the determination of solar internal structure
Despite the strong evidence that the peaks in the spectrum of solar oscillations are asymmetric, most de-terminations of mode frequencies have been based on fits of symmetric Lorentzian profiles to the Fourier or power spectra of oscillation time strings. The systematic errors resulting from neglecting the line asymmetry could have serious effects on inversions for the solar internal structure ...
متن کامل