Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Lagg, Andreas"'
Publikováno v:
A&A 665, A141 (2022)
The origin of the quiet Sun magnetism is under debate. Investigating the solar cycle variation observationally in more detail can give us clues about how to resolve the controversies. We investigate the solar cycle variation of the most magnetically
Externí odkaz:
http://arxiv.org/abs/2205.04419
Publikováno v:
A&A 651, L1 (2021)
One of the main characteristics of the penumbra of sunspots is the radially outward-directed Evershed flow. Only recently have penumbral regions been reported with similar characteristics to normal penumbral filaments, but with an opposite direction
Externí odkaz:
http://arxiv.org/abs/2106.05592
Studying the properties of the solar convection using high-resolution spectropolarimetry began in the early 90's with the focus on observations in the visible wavelength regions. Its extension to the infrared (IR) remains largely unexplored. The IR i
Externí odkaz:
http://arxiv.org/abs/1904.07306
Autor:
Singh, Nishant K., Käpylä, Maarit J., Brandenburg, Axel, Käpylä, Petri J., Lagg, Andreas, Virtanen, Ilpo
Publikováno v:
Astrophys. J. 863, 182 (2018)
Using a recently developed two-scale formalism to determine the magnetic helicity spectrum (Brandenburg et al. 2017), we analyze synoptic vector magnetograms built with data from the Vector Spectromagnetograph (VSM) instrument on the \emph{Synoptic O
Externí odkaz:
http://arxiv.org/abs/1804.04994
Publikováno v:
A&A 604, A98 (2017)
We investigate the magnetic field of a sunspot in the upper chromosphere and compare it to the field's photospheric properties. We observed the main leading sunspot of the active region NOAA 11124 on two days with the Tenrife Infrared Polarimeter-2 (
Externí odkaz:
http://arxiv.org/abs/1705.08404
Autor:
Käpylä, Petri J., Rheinhardt, Matthias, Brandenburg, Axel, Arlt, Rainer, Käpylä, Maarit J., Lagg, Andreas, Olspert, Nigul, Warnecke, Jörn
Publikováno v:
Astrophys. J. Lett. 845, L23 (2017)
We present numerical simulations of hydrodynamic overshooting convection in local Cartesian domains. We find that a substantial fraction of the lower part of the convection zone (CZ) is stably stratified according to the Schwarzschild criterion while
Externí odkaz:
http://arxiv.org/abs/1703.06845
Publikováno v:
A&A 599, A35 (2017)
We investigate the vertical gradient of the magnetic field of sunspots in the photospheric layer. Independent observations were obtained with the SOT/SP onboard the Hinode spacecraft and with the TIP-2 mounted at the VTT. We apply state-of-the-art in
Externí odkaz:
http://arxiv.org/abs/1610.00500
The Sun is replete with magnetic fields, with sunspots, pores and plage regions being their most prominent representatives on the solar surface. But even far away from these active regions, magnetic fields are ubiquitous. To a large extent, their imp
Externí odkaz:
http://arxiv.org/abs/1510.06865
Publikováno v:
A&A 583, A119 (2015)
The 3D structure of sunspots has been extensively studied for the last two decades. A recent advancement of the Stokes inversion technique prompts us to revisit the problem. We investigate the global depth-dependent thermal, velocity and magnetic pro
Externí odkaz:
http://arxiv.org/abs/1508.04830
The solar atmosphere is extremely dynamic, and many important phenomena develop on small scales that are unresolved in observations with the Helioseismic and Magnetic Imager (HMI) instrument on the Solar Dynamics Observatory (SDO). For correct calibr
Externí odkaz:
http://arxiv.org/abs/1407.2663