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Category/Subcategory: Natural Sciences/Astronomy

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: 555

Suppression of kinematic dynamo by shear flow

Author: Aditi Sood
Magnetic fields and shear flows play an important role in many systems including astrophysical, geophysical and laboratory plasmas. We report how the growth of magnetic fields is modified by large-scale shear flow by investiga ... more

Views: 421

The Envelope Spectrum

Author: René Kiefer
Solar-like oscillations exhibit a regular pattern of frequencies. This pattern is dominated by the small and large frequency separations between modes. The accurate determination of these parameters is of great interest, because ... more

Views: 572

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: 667

Measurements of helioseismic travel times

Author: Markus Roth
In time-distance helioseismology wave travel times are measured from the cross-correlation between Doppler velocities recorded at any two locations on the solar surface. All local helioseismology inferences rely critically on the ... more

Views: 435

Radial mode widths in red giant star spectra observed by Kepler

Author: Mathieu Vrard
The Kepler space mission has observed many solar-like pulsators, and helped to decipher their main characteristics (e.g: mass, radius, rotation). Most of the achievements recently obtained in that domain consist of the analysis of ... more

Views: 225

Simulations of the Visible Tunable Filter for the Daniel K. Inouye Solar Telescope

Author: Wolfgang Schmidt
The Visible Tunable Filter (VTF) is a narrowband tunable filter system for imaging spectroscopy and spectropolarimetry based. The instrument will be one of the first-light instruments of the Daniel K. Inouye Solar Telescope that i ... more

Views: 442

Observations of Red Giants with SONG

Author: Pere L. Pallé
One of the outstanding and unforeseen results from the Kepler mission is our new insight and understanding of red giant stars. These highly evolved stars, which are in the last stages of their life, provide extremely useful inform ... more

Views: 428

Quiet sun magnetic field evolution observed with Hinode SOT and IRIS

Author: Catherine Fischer
We have calibrated and aligned a co-spatial and co-temporal 3 hour quiet sun time series taken with the Hinode and IRIS satellites. Hinode SOT observed full Stokes profiles of the Fe I 630 line pairs with the Spectro-polarim ... more

Views: 392

Filaments data since 1919: A basis for statistics

Author: Jean Aboudarham
From 1919 to 2002, Paris-Meudon Observatory published synoptic maps of the Solar activity. Together with maps, tables were provided, containing some information concerning at least filaments. The board of Paris Observatory funded ... more

Views: 446