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Category/Subcategory: Natural Sciences/Astronomy

“Old” data – new science or why do we need long-term synoptic programs

Author: Alexei Pevtsov
It is not uncommon to see the references to recent (cycle 24) solar activity as “exceptionally low” or as an “extended long-term decline”. But how would we know that the current level of activity is unusual if we did not ... more

Views: 367

Thoughts on the 1 mHz dip, and the description of granulation seen in power spectra

Author: Hans-G. Ludwig
The presentation revolves around the issue whether one can devise a theoretical functional form for the granulation background in temporal power spectra.

Views: 52

Investigation of the frequency shifts 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 activity cycle and these changes provide diagnostics on ... more

Views: 446

The IAU working group on Coordination of Synoptic Observations of the Sun

Author: Alexei Pevtsov
In 2011, the International Astronomical Union (IAU) created a working group now known as the IAU inter-Division B-E working group on Coordination of Synoptic Observations of the Sun. The mission of this group is to facilitate the ... more

Views: 267

Differential Rotation and Dynamo Action in Solar-like Stars

Author: Jacobo Varela
The aim of the present study is to characterize the effect of the rotation rate in building magnetic field via dynamo action in solar-like stars. We use the code ASH to model the convective dynamo for solar-like stars at vario ... more

Views: 478

Observation of tiny flux tubes in the photosphere

Author: Zhong Liu
This is the first part of my talk at the meeting EST2018.

Views: 30

Convective full-sphere cross-helicity dynamo

Author: Valery Pipin
We study effects of the cross-helicity in the full-sphere large-scale mean-field dynamo models of the $\mathrm{0.3M_{\odot}}$ star rotating with the period of 10 days. In exploring several dynamo scenarios which are stemming from ... more

Views: 146

12mm Overlap with Galactic TeV emission

Author: Phoebe de Wilt
12mm Overlap with Galactic TeV emission

Views: 262

Straylight in data from the GREGOR Infrared Spectrograph

Author: Morten Franz
In this contribution, we investigate to which degree strayligh influences results from the GREGOR Infrared Spectrograph. To this end, we use the synthesis module of the SIR code to perform radiative transfer calculations in a 3D-M ... more

Views: 137