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Category/Subcategory: Natural Sciences/Astronomy

Stellar magnetic activity and variability of oscillation parameters - An investigation of 24 solar-like stars observed by Kepler

Author: René Kiefer
Context. The Sun and solar-like stars undergo activity cycles for which the underlying mechanisms are not well understood. The oscillations of the Sun are known to vary with its activity cycle and these changes provide diagnostics ... more

Views: 430

The Importance of Long-term Synoptic Observations and Data Sets for Solar Physics and Helioseismology

Author: Markus Roth
A casual single glance at the Sun would not lead an observer to conclude that it varies. The discovery of the 11-year sunspot cycle was only made possible through systematic daily observations of the Sun over 150 years and even to ... more

Views: 423

Validation of Spherical Born Approximation Sensitivity Functions for Measuring Deep Solar Meridional Flow

Author: Vincent Böning
Accurate measurements of deep solar meridional flow are of vital interest for understanding the solar dynamo. In this paper, we validate a recently developed method for obtaining sensitivity functions (kernels) for travel-time mea ... more

Views: 352

Experimental results for infrared aberration tracking using a correlation algorithm on two star extended field

Author: Narsireddy Anugu
We report an experimental results of different correlation algorithms for an extended source wavefront sensor.

Views: 422

Meridional Circulation and Global Solar Oscillations

Author: Markus Roth
We investigate the influence of large-scale meridional circulation on solar p-modes by quasi-degenerate perturbation theory, as proposed by Lavely and Ritzwoller (1992). As an input flow we use various models of stationary meridio ... more

Views: 484

Surface waves in solar granulation observed with Sunrise

Author: Markus Roth
Solar oscillations are expected to be excited by turbulent flows in the intergranular lanes near the solar surface. Time series recorded by the IMaX instrument aboard the {\sc Sunrise} observatory reveal solar oscillations at hig ... more

Views: 321

Verification of the helioseismic Fourier-Legendre analysis for meridional flow measurements

Author: Markus Roth
{Measuring the Sun's internal meridional flow is one of the key issues of helioseismology. Using the Fourier-Legendre analysis is a technique for addressing this problem.} {We validate this technique with the help of artificial ... more

Views: 386

The SpaceInn-SISMA database: characterization of a large sample of variable and active stars by means of HARPS spectra

Author: Monica Rainer
We created a large database of physical parameters and variability indicators by fully reducing and analysing the large number of spectra taken to complement the asteroseismic observations of the CoRoT satellite. 7103 spectra of 2 ... more

Views: 426

Global helioseismic evidence for a deeply penetrating Solar meridional flow consisting of multiple flow cells

Author: Markus Roth
We use a novel global helioseismic analysis method to infer the meridional flow in the deep Solar interior. The method is based on the perturbation of eigenfunctions of Solar p modes due to meridional flow. We apply this method ... more

Views: 673