492 citations
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5 papers · 2 filters
Hydromagnetic turbulence in computer simulations
A. Brandenburg, W. Dobler
In ordinary turbulence research it has been a long standing tradition to solve the equations in spectral space giving the best possible accuracy. This is indeed a natural choice fo…
Multiwavelenght analysis of Gl 355 (LQ Hya)
S. Covino, G. Tagliaferri, E. Bertone +8
We discuss ROSAT, ASCA, {\it Beppo}SAX and optical observations of the young active star Gl 355. During the ROSAT observation a strong flare was detected with a peak flux more than…
Magnetoconvection and dynamo coefficients: Dependence of the alpha-effect on rotation and magnetic field
M. Ossendrijver, M. Stix, A. Brandenburg
We present numerical simulations of three-dimensional compressible magnetoconvection in a rotating rectangular box that represents a section of the solar convection zone. The box c…
Ground-Based Coronagraphy with High Order Adaptive Optics
A. Sivaramakrishnan, C. D. Koresko, R. B. Makidon +2
We summarize the theory of coronagraphic optics, and identify a dimensionless fine-tuning parameter, F, which we use to describe the Lyot stop size in the natural units of the coro…
Multi-Conjugate Adaptive Optics with two Deformable Mirrors - Requirements and Performance
T. Berkefeld, A. Glindemann, S. Hippler
In order to increase the corrected field of view of an adaptive optics (AO) system, several deformable mirrors (DM) have to be placed in the conjugate planes of the dominant turbul…