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22 papers · 1 filter
Scattering polarization of hydrogen lines in the presence of turbulent electric fields
R. Casini, R. Manso Sainz
We study the broadband polarization of hydrogen lines produced by scattering of radiation, in the presence of isotropic electric fields. In this paper, we focus on two distinct pro…
A Qualitative Interpretation of the Second Solar Spectrum of Ce ll
R. Manso Sainz, E. Landi Degl'Innocenti, J. Trujillo Bueno
This is a theoretical investigation on the formation of the linearly polarized line spectrum of ionized cerium in the sun. We calculate the scattering line polarization pattern eme…
Simulation of quiet Sun waves in the Ca II infrared triplet
A. Pietarila, H. Socas-Navarro, T. Bogdan +2
The Ca II infrared triplet around 8540 A is a good candidate for observing chromospheric magnetism. We show results from combining a radiation hydrodynamic simulation with a Stokes…
Evidence for Fine Structure in the Chromospheric Umbral Oscillation
R. Centeno, H. Socas-Navarro, M. Collados +1
Novel spectro-polarimetric observations of the \ion{He}{1} multiplet are used to explore the dynamics of the chromospheric oscillation above sunspot umbrae. The results presented h…
On the fine structure of the sunspot penumbrae. III The vertical extension of penumbral filaments
J. M. Borrero, S. K. Solanki, A. Lagg +2
In this paper we study the fine structure of the penumbra as inferred from the uncombed model (flux tube embedded in a magnetic surrounding) when applied to penumbral spectropolari…
A ~ 7.5 Earth-Mass Planet Orbiting the Nearby Star, GJ 876
E. J. Rivera, J. J. Lissauer, R. P. Butler +6
High precision, high cadence radial velocity monitoring over the past 8 years at the W. M. Keck Observatory reveals evidence for a third planet orbiting the nearby (4.69 pc) dM4 st…