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Category/Subcategory: Natural Sciences/Astronomy

VARIATION OF ACOUSTIC CUTOFF PERIOD WITH HEIGHT IN THE SOLAR ATMOSPHERE: THEORY VERSUS OBSRVETIONS

Author: Aneta Wisniewska
Recently Wiśniewska et al. demonstrated observationally how the acoustic cutoff frequency varies with height in the solar atmosphere including the upper photosphere and the lower and middle chromosphere, and showed that the obser ... more

Views: 388

The Carina Nebula and Gum 31 molecular complex: I. Molecular gas distribution, column densities and dust temperatures

Author: Michael Burton
We report high resolution observations of the 12CO(1 → 0) and 13CO(1 → 0) molecular lines in the Carina Nebula and the Gum 31 region obtained with the 22-m Mopra telescope as part of the The Mopra Southern Galactic Plane CO Su ... more

Views: 420

Modelling solar and stellar brightness variabilities

Author: Alexander Shapiro
Total and spectral solar irradiance, TSI and SSI, have been measured from space since 1978. This is accompanied by the development of models aimed at replicating the observed variability by relating it to solar surface magnetism. ... more

Views: 382

Stellar magnetic activity and variability of oscillation parameters - An investigation of 24 solar-like stars observed by Kepler

Author: René Kiefer
Context. The Sun and solar-like stars undergo activity cycles for which the underlying mechanisms are not well understood. The oscillations of the Sun are known to vary with its activity cycle and these changes provide diagnostics ... more

Views: 430

Design of a next generation synoptic solar observing network: solar physics research integrated network group (SPRING)

Author: Markus Roth
Long-term synoptic observations of the Sun in different wavelength regions are essential to understand its secular behavior. Such observations have proven very important for discovery of 11 year solar activity cycle, 22 year magne ... more

Views: 12

Recent developments in helioseismic analysis methods and solar data assimilation

Author: Markus Roth
We overview recent advances and results in enhancing and developing helioseismic analysis methods and in solar data assimilation. In the first part of this paper we will focus on selected developments in time-distance and global h ... more

Views: 395

The GREGOR Fabry‐Pérot Interferometer (GFPI) ‐ Technical Innovations and Results achieved in 2013

Author: Klaus Gerhard Puschmann
This paper shall provide a summary of not yet published technical innovations to the GREGOR Fabry-Pérot Interferometer (GFPI) at the 1.5m GREGOR Solar Telescope (Europe's largest solar telescope) that I implemented in 2013 as the ... more

Views: 1054

Design, development and calibration of the GRAVITY acquisition camera software to monitor four telescope beams

Author: Narsireddy Anugu
We report the development of the GRAVITY acquisition camera software to monitor and analyse the four very large telescopes interferometer beams.

Views: 339

Verification of the helioseismic Fourier-Legendre analysis for meridional flow measurements

Author: Markus Roth
{Measuring the Sun's internal meridional flow is one of the key issues of helioseismology. Using the Fourier-Legendre analysis is a technique for addressing this problem.} {We validate this technique with the help of artificial ... more

Views: 386