Author: Daniel ReeseThis 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
Author: Markus RothThis 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
Author: Ângela R. G. SantosThe 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
Author: Jakob MosumgaardBrief 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
Author: Daniel HoldsworthWe 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
Author: Johannes Löhner-BöttcherThe 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