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- Ethiopian Space Science and Technology InstituteET10 papers
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4 papers · 1 filter
Coronal Magnetic Field Structure and Evolution for Flaring AR 11117 and its Surroundings
Tilaye Tadesse, T. Wiegelmann, B. Inhester +1
In this study, photospheric vector magnetograms obtained with the Synoptic Optical Long-term Investigations of the Sun survey (SOLIS), are used as boundary conditions to model the…
The Cosmological Constant and the Gravitational Light Bending
Tolu Biressa, J. A. de Freitas Pacheco
The solution of the null non-radial geodesic in a Schwarzschild-de Sitter background is revisited. The gravitational bending of a light ray is affected by the cosmological constant…
Cross section for double charmonium production in electron-positron annihilation at energy = 10.6 GeV
Elias Mengesha, Shashank Bhatnagar
In this work we study the process at energy observed recently at B-factories whose measurements were made by Babar and…
Magnetic Connectivity between Active Regions 10987, 10988, and 10989 by Means of Nonlinear Force-Free Field Extrapolation
T. Tadesse, T. Wiegelmann, B. Inhester +1
Extrapolation codes for modelling the magnetic field in the corona in cartesian geometry do not take the curvature of the Sun's surface into account and can only be applied to rela…