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Category/Subcategory: Natural Sciences/Astronomy

The revised sunspot number: new properties and new data standards

Author: Frederic Clette
In 2015, a new entirely recalibrated version of the sunspot number and group number series has been released. Important changes, by up to 40\%, have been applied to the original historical series, leading to a new picture of the s ... more

Views: 450

Observations of absolute convective blue-shifts with LARS at the VTT

Author: Johannes Löhner-Böttcher
The Laser Absolute Reference Spectrograph (LARS) is a novel scientific instrument for solar observations with the Vacuum Tower Telescope (VTT) on Tenerife. It works as a combination of the high-resolution Echelle Spectrograph of t ... more

Views: 242

Magnetic sensitivity of the scattering polarization signals in the wings of the Ca I line at $4227$ angstrom

Author: Ernest Alsina
The scattering polarization signal of the Ca I line at $4227$ angstrom shows a peculiar triple-peak profile, with a sharp peak in the line core and broader peaks in the wings. This structure is due to frequency coherence in line s ... more

Views: 29

Flow-twist coupling in the solar atmosphere

Author: Youra Taroyan
The ubiquity of magnetic twists and plasma flows, as well as their importance in generating the dynamic behaviour of the Sun has become apparent only recently due to improvements in spectral, temporal and spatial resolution of ins ... more

Views: 38

Halo formation in 3D MHD simulations of sunspots

Author: Irina Thaler
Halo formation in realistic 3D MHD simulations Thaler I., Vigeesh G., Roth, M. Since the first discovery of acoustic halos around magnetic regions by (Brown 1992, Toner and LaBonte 1993) many observational and theoretica ... more

Views: 302

Characteristics of magnetic helicity flux in the solar active region photosphere

Author: Sung-Hong Park
We investigated statistical characteristics of magnetic helicity injected per unit time through the active region photosphere using vector magnetic field data from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynam ... more

Views: 112

Overview of the four SOLARNET campaigns in 2016 at GREGOR

Author: Christoph Kuckein
Short overview of the four SOLARNET campaigns in 2016 at GREGOR

Views: 218

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: 80