The ScienceMedia Network
From scientists for scientists! - Now at your service.

Category/Subcategory: Natural Sciences/Astronomy

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: 466

Recent developments in helioseismic analysis methods and solar data assimilation

Author: Markus Roth
We overview recent advances and results in enhancing and developing helioseismic analysis methods and in solar data assimilation. In the first part of this paper we will focus on selected developments in time-distance and global h ... more

Views: 432

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: 493

Modelling solar and stellar brightness variabilities

Author: Alexander Shapiro
Total and spectral solar irradiance, TSI and SSI, have been measured from space since 1978. This is accompanied by the development of models aimed at replicating the observed variability by relating it to solar surface magnetism. ... more

Views: 408

A new cosmic coincidence in conjunction with the cosmic expansion.

Author: Christian Nutto
The discovery of the cosmic acceleration (Perlmutter & Riess, 1999; Perlmutter et al., 1999; Riess et al., 1998) along with the presence of dark matter is one of the most intriguing puzzles in modern physics and cosmology. Up to n ... more

Views: 345

Observational evidence for variations of the acoustic cutoff frequency with height in the solar atmosphere

Author: Aneta Wisniewska
Direct evidence for the existence of an acoustic cuto frequency in the solar atmosphere is given by observations performed by using the HELioseismological Large Regions Interferometric DEvice operating on the Vacuum Tower Teles ... more

Views: 393

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: 410

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

Author: Markus Roth
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: 147