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Category/Subcategory: Natural Sciences/Astronomy

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: 540

Celebrating Mopra: looking to the future

Author: Michael Burton
Workshop poster for "Celebrating Mopra: looking to the future", held at the University of New South Wales in Sydney on Dec 9-11, 2015. Also including a workshop on the JCMT and the East Asia Observatory.

Views: 618

The Early Local Universe – Inside and Outside the Stars

Author: Birgitta Nordstrom
Extremely metal-poor (EMP) halo stars with [Fe/H] below ~ -3 are considered to be fossil records of conditions in the early halo. In the naïve picture in which iron is a proxy for overall metallicity and indirectly for time, EMP ... more

Views: 533

Solarnet Transnational Access and Service Programme 2013 - 2017

Author: Solarnet - High Resolution Solar Physics Network
As a part of the SOLARNET project, the Transnational Access and Service Programme supports the access of the European solar physics community to some of the best European telescopes. To enhance the efficiency of data usage, exte ... more

Views: 454

Non-LTE inversion of spectropolarimetric and spectroscopic observations of a small active-region filament observed at the VTT

Author: Pavol Schwartz
An active-region filament in the active region NOAA 12159 (at solar disk coordinates [x,y] = [225,-440] arcsec) was observed with the Vacuum Tower Telescope at Tenerife on 11 September 2014. Full-Stokes spectropolarimetric observa ... more

Views: 631

Compensated diffraction-limited imaging with adaptive optics at the GREGOR Solar Telescope

Author: Oskar von der Lühe
The combination of adaptive optics with post processing of sequences of short exposures is a very successful technique to produce diffraction limited images of the solar photosphere throughout the visible spectral domain. Viable a ... more

Views: 1060

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: 47

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

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: 541

European Helio- and Asteroseismology Network - HELAS

Author: Markus Roth
The objective of the European Helio- and Asteroseismology Network (HELAS) is to coordinate the activities of the European activities in helio- and asteroseismology. HELAS was funded as Coordination Action under the European Uni ... more

Views: 546