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Category/Subcategory: Natural Sciences/Astronomy

CR 2100: meridional flow measurements with Fourier-Legendre decomposition technique and ring-diagram analysis

Author: Markus Roth
Presentation on the Fourier-Legendre decomposition technique shown at the LoHCo Meeting in Stanford in August 2011.

Views: 269

Stellar Inversion Techniques

Author: Daniel Reese
This course describes stellar inversion techniques. It starts with the variational principle, shows how to derive various kernels, then describes different inversion techniques (regularised least-squares, optimally-localised aver ... more

Views: 261

Helioseismology Overview and Solar Orbiter

Author: Markus Roth
This presentation was given at the Solar Orbiter Science Activity Plan Meeting #4. It is a review on the techniques and achievements of helioseismology during the last decades. Furthermore, it gives an outlook on the science to ... more

Views: 127

Contribution of sunspots to the observed frequency shifts

Author: Ângela R. G. Santos
The frequencies of the solar oscillations are known to vary in phase with the Sun's activity level. The solar cycle is accompanied by changes in the overall magnetic field as well as in the area covered by active regions, which c ... more

Views: 254

Implementing 3D T-tau relations in 1D Stellar Evolutionary Calculations

Author: Jakob Mosumgaard
Brief presentation on the procedure for implementing T-tau relations extracted from 3D simulations into 1D stellar models. More specifically, how the T-tau relations from Trampedach et al. (2014, MNRAS, 442, 805) and variable mixi ... more

Views: 184

The first K2 roAp star: HD 24355 pulsating in a distorted quadruploe mode

Author: Daniel Holdsworth
We present an analysis of the rst K2 observations of a rapidly oscillating Ap (roAp) star, HD 24355. The star was discovered to be a roAp star by Holdsworth et al. (2014), with a frequency of 224.31 c/d (2596.18 microHz; P = 6.4 ... more

Views: 276

Observations of absolute convective blue-shifts with LARS at the VTT

Author: Johannes Löhner-Böttcher
The Laser Absolute Reference Spectrograph (LARS) is a novel scientific instrument for solar observations with the Vacuum Tower Telescope (VTT) on Tenerife. It works as a combination of the high-resolution Echelle Spectrograph of t ... more

Views: 149

Vector Magnetic Field and ChroMag

Author: Alfred de Wijn
Vector Magnetic Field and ChroMag

Views: 164