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12 papers · 2 filters
Plasma Beta Stratification in the Solar Atmosphere: A Possible Explanation for the Penumbra Formation
Philippe-A. Bourdin
Plasma beta is an important and fundamental physical quantity in order to understand plasma dynamics, particularly in the context of magnetically active stars, because it tells abo…
A new method of measuring center-of-mass velocities of radially pulsating stars from high-resolution spectroscopy
N. E. Britavskiy, E. Pancino, V. Tsymbal +2
We present a radial velocity analysis of 20 solar neighborhood RR Lyrae and 3 Population II Cepheids variables. We obtained high-resolution, moderate-to-high signal-to-noise ratio…
Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES
P. Leitner, B. Lemmerer, A. Hanslmeier +4
The ANTARES radiation hydrodynamics code is capable of simulating the solar granulation in detail unequaled by direct observation. We introduce a state-of-the-art numerical tool to…
The Association of a J-burst with a Solar Jet
D. E. Morosan, P. T. Gallagher, R. A. Fallows +56
Context. The Sun is an active star that produces large-scale energetic events such as solar flares and coronal mass ejections and numerous smaller-scale events such as solar jets.…
Spectroscopic inversions of the Ca ii 8542 Å line in a C-class solar flare
D. Kuridze, V. Henriques, M. Mathioudakis +5
We study the C8.4 class solar flare SOL2016-05-14T11:34 UT using high-resolution spectral imaging in the Ca ii 8542 Å line obtained with the CRISP imaging spectropolarimeter on the…
Stellar Coronal Mass Ejections I. Estimating occurrence frequencies and mass-loss rates
P. Odert, M. Leitzinger, A. Hanslmeier +1
Stellar coronal mass ejections (CMEs) may play an important role in mass- and angular momentum loss of young Sun-like stars. If occurring frequently, they may also have a strong ef…