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6 papers · 1 filter
Exoplanets imaging with a Phase-Induced Amplitude Apodization Coronagraph - I. Principle
Olivier Guyon, Eugene A. Pluzhnik, Raphael Galicher +3
Using 2 aspheric mirrors, it is possible to apodize a telescope beam without losing light or angular resolution: the output beam is produced by ``remapping'' the entrance beam to p…
Nonperturbative dynamics of scalar field theories through the Feynman-Schwinger representation
Cetin Savkli, Franz Gross, John Tjon
In this paper we present a summary of results obtained for scalar field theories using the Feynman-Schwinger (FSR) approach. Specifically, scalar QED and chi^2phi theories are cons…
High-amplitude, long-term X-ray variability in the solar-type star HD 81809: the beginning of an X-ray activity cycle?
F. Favata, G. Micela, S. L. Baliunas
We present the initial results from our XMM program aimed at searching for X-ray activity cycles in solar-type stars. HD 81809 is a G2-type star (somewhat more evolved than the Sun…
Flare Generated Acoustic Oscillations in Solar and Stellar Coronal Loops
D. Tsiklauri, V. M. Nakariakov, T. D. Arber +1
Low-frequency longitudinal oscillations of a flaring coronal loop are studied numerically. In the recent work of Nakariakov et al., Astron. and Astrophys., 414, L25-L28 (2004) it h…
Radiative Hydrodynamic Modeling of the Bastille-Day Flare (14 July, 2000): I. Numerical Simulations
D. Tsiklauri, M. J. Aschwanden, V. M. Nakariakov +1
A 1-D loop radiative hydrodynamic model that incorporates the effects of gravitational stratification, heat conduction, radiative losses, external heat input, presence of helium, a…
Acoustic Oscillations in Solar and Stellar Flaring Loops
V. M. Nakariakov, D. Tsiklauri, A. Kelly +2
Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbati…