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Category/Subcategory: Natural Sciences/Physics

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: 577

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: 583

Validating Spherical Born Kernels for Meridional Flows

Author: Vincent Böning
We present the current status of an undergoing validation of a recently developed model for computing spherical Born approximation sensitivity functions for flows. In a first step, power spectra and reference cross-correlations fr ... more

Views: 581

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: 4241

Statistical investigation of CMEs properties and their correlation with flares during Solar Cycle 23 and 24.

Author: compagnino antonio alessio
The Large Angle Spectrometric Coronagraph (LASCO), onboard the Solar and Heliospheric Observatory (SOHO) provided us observations extending for the two Solar Cycles 23 and 24 (31 July 1996 - 31 March 2014) that allow one to compar ... more

Views: 84

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: 681

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: 406

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: 779

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: 688

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: 573