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pro vyhledávání: '"Stenflo J"'
Angle-frequency coupling in scattering of polarized light on atoms is represented by the angle-dependent (AD) partial frequency redistribution (PRD) matrices. There are several lines in the linearly polarized solar spectrum, for which PRD combined wi
Externí odkaz:
http://arxiv.org/abs/2007.04044
Publikováno v:
2019, The Astrophysical Journal, 883, 188 (11 pages)
Quantum interference effects together with partial frequency redistribution (PFR) in line scattering produce subtle signatures in the so called Second Solar Spectrum (the linearly polarized spectrum of the Sun). These signatures are modified in the p
Externí odkaz:
http://arxiv.org/abs/1910.10913
Autor:
Bianda, M., Berdyugina, S., Gisler, D., Ramelli, R., Belluzzi, L., Carlin, E. S., Stenflo, J. O., Berkefeld, T.
Publikováno v:
A&A 614, A89 (2018)
Context. The scattering polarization signal observed in the photospheric Sr i 4607 {\AA} line is expected to vary at granular spatial scales. This variation can be due to changes in the magnetic field intensity and orientation (Hanle effect), but als
Externí odkaz:
http://arxiv.org/abs/1803.03531
Autor:
Ramelli, R., Setzer, M., Engelhard, M., Bianda, M., Paglia, F., Stenflo, J. O., Küveler, G., Plewe, R.
The solar limb darkening function is well known and is widely employed in models of the solar atmosphere. However, there has been a lack of systematic spectrally resolved measurements. Therefore we recently decided to start an observing campaign with
Externí odkaz:
http://arxiv.org/abs/1708.03284
Autor:
Stenflo, J. O.
The D$_1$ enigma is an anomaly, which was first observed on the Sun as a symmetric polarization peak centered in the core of the sodium D$_1$ line that is expected to be intrinsically unpolarizable. To resolve this problem the underlying physics was
Externí odkaz:
http://arxiv.org/abs/1610.09861
Interference between magnetic substates of the hyperfine structure states belonging to different fine structure states of the same term influences the polarization for some of the diagnostically important lines of the Sun's spectrum, like the sodium
Externí odkaz:
http://arxiv.org/abs/1512.07736
$F$-state interference significantly modifies the polarization produced by scattering processes in the solar atmosphere. Its signature in the emergent Stokes spectrum in the absence of magnetic fields is depolarization in the line core. In the presen
Externí odkaz:
http://arxiv.org/abs/1512.07731
Autor:
Stenflo, J. O.
The Swiss Federal Observatory, which had been founded in 1863 by Rudolf Wolf, was dissolved in connection with the retirement of Max Waldmeier in 1979. The determination of the Zurich sunpot number, which had been a cornerstone activity of the observ
Externí odkaz:
http://arxiv.org/abs/1512.06229
The Ba II D2 line at 4554 A is a good example, where the F-state interference effects due to the odd isotopes produce polarization profiles, which are very different from those of the even isotopes that do not exhibit F-state interference. It is ther
Externí odkaz:
http://arxiv.org/abs/1409.0465
The Sc II 4247 A line formed in the chromosphere is one of the lines well known, like the Na I D_2 and Ba II D_2, for its prominent triple peak structure in Q/I and the underlying quantum interference effects governing it. In this paper, we try to st
Externí odkaz:
http://arxiv.org/abs/1408.4247