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Category/Subcategory: Natural Sciences/Physics

Accurate numerical solutions to the forward problem of local helioseismology

Author: Chris Hanson
We compute acoustic Green’s functions in an axisymmetric solar background model, which may include a meridional flow and differential rotation. The wave equation is solved in the frequency domain using a finite element solver. ... more

Views: 4105

LARS – the Laser Absolute Reference Spectrograph at the VTT

Author: Johannes Löhner-Böttcher
LARS is an Absolute Reference Spectrograph. It performs fiber-coupled solar observations with the high-resolution Echelle Spectrograph of the Vacuum Tower Telescope (VTT) at the Observatorio del Teide on Tenerife. The scientific i ... more

Views: 225

Numerical simulations of magneto-acoustic wave propagation from the upper convection zone into the chromosphere.

Author: Christian Nutto
The contribution of acoustic waves to the chromospheric heating is still an open question. To discuss this Issue, it is crucial to understand the propagation of waves from the convection zone, where the waves are excited, into the ... more

Views: 391

Interference of geomagnetic storms in ionospheric plasma bubbles over last solar minimum period

Author: Flavia Coelho Tardelli
Studies presented on the relation Sun-Earth system are of great importance currently. Ionospheric irregularities in the F-region, caused by geomagnetic storms have meanings and adverse effects on the Earth. The recent advancement ... more

Views: 395

High-resolution modeling of the solar photosphere with the ANTARES RHD-code

Author: Peter Leitner
Small granules that do not originate from the fragmentation process of regular sized granular cells and evolve on a considerably shorter timescale populate the intergranular lanes. They are found in high-resolution observational a ... more

Views: 483

Modelling the Line-of-Sight Projection and Filtering-Induced Leakage in Time-Distance Helioseismology

Author: Vincent Böning
In current approaches to time-distance helioseismology, the line-of-sight projection effect on the traveltimes is not fully taken into account. Furthermore, filtering of full-disc data induces leakage due to the projection onto ... more

Views: 379

Asteroseismic signature of a starspot

Author: Emanuele Papini
Stellar acoustic oscillations are affected by magnetic activity, however it is unclear how a single starspot would affect the power spectrum of oscillations. Since the starspot rotates with the star, it causes a perturbation that ... more

Views: 272

Computational Local Helioseismology in the Frequency Domain

Author: Chris Hanson
Forward problems in local helioseismology have thus far been addressed in a semi-analytical fashion using the Born approximation and normal-mode expansions or direct simulations. However, it has proven difficult to take into acco ... more

Views: 355

Spherical Born Kernels for Flows in Time-Distance Helioseismology

Author: Vincent Böning
We extend an existing Born approximation model for calculating the linear sensitivity of helioseismic travel-times to flows from Cartesian to spherical geometry. This development is necessary to use the Born approximation for in ... more

Views: 389

Solar Physics Research Integrated Network Group (SPRING) : A Next Generation Ground-based Synoptic Network

Author: Sanjay gosain
SPRING is an evolving concept for next generation solar synoptic observations network. It is envisaged that the new network will cater to the needs of (i) Helioseismology community, by providing improved resolution Doppler observa ... more

Views: 466