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Category/Subcategory: Natural Sciences/Astronomy

Science challenges for EST

Author: Oskar Steiner
From numerical simulations of highest spatial resolution and high resolution observations, we may guess the science questions to be tackled with future large solar telescopes. Selected examples are discussed, trying to determine t ... more

Views: 102

The quest of the horizontal magnetic field

Author: Oskar Steiner
An important discovery achieved with Hinode’s Solar Optical Telescope/Spectro-Polarimeter (SOT/SP) was that in the mean, the magnetic field over wide areas of the quiet Sun photosphere is predominantly horizontal, i.e., parallel ... more

Views: 33

Non-adiabatic pulsations in ESTER models

Author: Daniel Reese
One of the greatest challenges in interpreting the pulsations of rapidly rotating stars is mode identification, i.e. correctly matching theoretical modes to observed pulsation frequencies. Indeed, the latest observations as well ... more

Views: 301

Synpotic Solar Physics: Past and Future

Author: Markus Roth
Presentation on the need for synoptic observations of the Sun. This presentation was given at the 2nd SPRING workshop in Tatranska Lomnica, October 14, 2014.

Views: 296

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: 145

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: 83

Future Synoptic Ground-based Network - Results of the SPRING Feasibility Study

Author: Markus Roth
These are the slides given on October 16, 2017 at the Splinter Meeting on Synoptic Observations. This summarizes the results of the Work Package (WP) 80 of the EU FP7 activity Solarnet.

Views: 138

Subsurface helicity of active regions 12192 and 10486

Author: Rudolf Komm
The active region 10486 that produced the Halloween flares in 2003 initiated our interest in the kinetic helicity of subsurface flows associated with active regions. This lead to the realization that the helicity of subsurface fl ... more

Views: 223

Magnetic Helicity in the Solar Atmosphere: Much Gained, Still a Lot to Learn

Author: Manolis Georgoulis
The 1980s and 1990s saw seminal works on the role of magnetic helicity in the magnetized solar atmosphere. Thanks to helicity, our understanding of the quiescent and eruptive solar magnetism has progressed substantially since then ... more

Views: 116

Magnetic topology of a North polar region

Author: Adur Pastor Yabar
The magnetism at the poles is similar to that of the quiet Sun in the sense that no active regions are present there. However, the polar quiet Sun is somewhat different from that at the activity belt as it has a global polarity th ... more

Views: 21