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Category/Subcategory: Natural Sciences/Astronomy

Testing the Gallavotti-Cohen Fluctuation Theorem on the Solar Photosphere

Author: Giorgio Viavattene
The understanding of fluctuations in systems far from equilibrium is one of the key issues of non-equilibrium statistical thermodynamics. The Fluctuation Theorem of Gallavotti and Cohen (1995) [GCFT] portrays some symmetry featur ... more

Views: 466

European Helio- and Asteroseismology Network - Achievements after four years of HELAS

Author: Markus Roth
HELAS had the major objective to bring together the widely dispersed European research groups active in helio- and asteroseismology. The transfer of knowledge and data analysis techniques through HELAS lead to a structuring of thi ... more

Views: 561

Improving 1D Stellar Models with 3D Atmospheres

Author: Jakob Mosumgaard
How to improve traditional 1D models of stellar structure and evolution using results from sophisticated 3D simulations of stellar atmospheres. More specifically, how T-tau relations from Trampedach et al. (2014, MNRAS, 442, 805) ... more

Views: 588

A fitting LEGACY – modelling Kepler’s best stars

Author: Magnus Johan Aarslev
The LEGACY sample represents the best solar-like stars observed in the Kepler mission. The 66 stars in the sample are on the main sequence and have more than one year’s data in short cadence, allowing for precise extraction of i ... more

Views: 393

16CygA&B and Kepler Legacy values : Differences between the values of frequencies by different fitters

Author: Ian Roxburgh
The differences between the oscillation frequencies and uncertainty estimates of a star derived by different fitters can be large, sufficiently large so that, were one to find a stellar model that fitted one frequency set ($\chi^ ... more

Views: 1002

20 Years of GONG: p Mode Parameters and the Solar Cycle

Author: René Kiefer
The properties of solar acoustic oscillations are known to vary with the solar cycle. With 20 years of continuous observations by GONG, we are now in the position to carry out a comparison of the variation of the p mode parameters ... more

Views: 487

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: 604

Core Overshooting and Extra Mixing in Two Kepler Slowly Pulsating B stars

Author: ehsan moravveji
KIC 7760680 was discovered by Papics et al. (2015) to be the richest known Slowly Pulsating B star, by exhibiting 36 consecutive dipole prograde (l=1, m=+1) gravity (g-) modes. Moreover, the monotonically decreasing period spacing ... more

Views: 388

The CoMP-S and SCD spectropolarimeters at the Lomnicky Peak Observatory as supporting instrumentation to EST.

Author: Peter Gomory
We present actual status and observing possibilities of the Coronal Multi-channel Polarimeter (CoMP-S) and Solar Chromospheric Detector (SCD) installed at the Lomnicky Peak Observatory. The CoMP-S is a dual beam spectropolarimeter ... more

Views: 400

Continuum emission enhancements in flares observed by ROSA and IRIS

Author: Francesca Zuccarello
During solar flares, magnetic energy can be converted into electromagnetic radiation from radio waves to gamma rays. In the most energetic events, enhancements in the continuum at visible wavelengths may be present (white-light [W ... more

Views: 68