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Category/Subcategory: Natural Sciences/Astronomy

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: 993

Observational evidence for variations of the acoustic cutoff frequency with height in the solar atmosphere

Author: Aneta Wisniewska
Direct evidence for the existence of an acoustic cuto frequency in the solar atmosphere is given by observations performed by using the HELioseismological Large Regions Interferometric DEvice operating on the Vacuum Tower Teles ... more

Views: 317

The Importance of Long-term Synoptic Observations and Data Sets for Solar Physics and Helioseismology

Author: Markus Roth
A casual single glance at the Sun would not lead an observer to conclude that it varies. The discovery of the 11-year sunspot cycle was only made possible through systematic daily observations of the Sun over 150 years and even to ... more

Views: 390

Spicules and their on-disk counterparts - the main driver for solar chromospheric heating?

Author: Klaus Gerhard Puschmann
The question how the outer solar atmosphere is heated from solar photospheric temperatures of about 5800K up to solar chromospheric and coronal temperatures of about 20.000K and millions of degrees respectively, remained without a ... more

Views: 915


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: 355

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: 333

Meridional Circulation and Global Solar Oscillations

Author: Markus Roth
We investigate the influence of large-scale meridional circulation on solar p-modes by quasi-degenerate perturbation theory, as proposed by Lavely and Ritzwoller (1992). As an input flow we use various models of stationary meridio ... more

Views: 434

Surface waves in solar granulation observed with Sunrise

Author: Markus Roth
Solar oscillations are expected to be excited by turbulent flows in the intergranular lanes near the solar surface. Time series recorded by the IMaX instrument aboard the {\sc Sunrise} observatory reveal solar oscillations at hig ... more

Views: 297