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Category/Subcategory: Natural Sciences/Physics

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: 508

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: 446

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: 503

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: 773

Temporal variations of Solar and Interplanetary conditions for the last 4 decades

Author: Bogyeong Kim
There are many parameters representing the conditions of space environments. Those are modulated in general by Solar Cycle (SC) defined by sunspot number temporal variation. However, all parameters do not have same cyclic features ... more

Views: 610

Exploitation of Space Data for Innovative Helio- and Asteroseismology - SpaceInn

Author: Markus Roth
The European Helio- and Asteroseismology Network (HELAS) has initiated the follow-up project "SpaceInn - Exploitation of Space Data for Innovative Helio- and Asteroseismolgoy" with the mission to build on the existing European str ... more

Views: 622

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: 358

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: 567

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: 486

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: 4189