Zobrazeno 1 - 10
of 101
pro vyhledávání: '"Smitha, H."'
Poynting flux generated by random shuffling of photospheric magnetic footpoints is transferred through the upper atmosphere of the Sun where the plasma is heated to over 1 MK in the corona. High spatiotemporal resolution observations of the lower atm
Externí odkaz:
http://arxiv.org/abs/2410.04964
The Mg ii h&k lines are key diagnostics of the solar chromosphere. They are sensitive to the temperature, density, and non-thermal velocities in the chromosphere. The average Mg ii h&k line profiles arising from previous 3D chromospheric simulations
Externí odkaz:
http://arxiv.org/abs/2410.04594
Autor:
Vukadinović, D., Smitha, H. N., Korpi-Lagg, A., van Noort, M., Durán, J. S. Castellanos, Solanki, S. K.
Publikováno v:
A&A 686, A262 (2024)
For many transitions, atomic data, such as the oscillator strength (log(gf)) and the central wavelength of the line, are poorly constrained or even unknown. We present and test a new inversion method that infers atomic line parameters and the height
Externí odkaz:
http://arxiv.org/abs/2404.03291
Autor:
Campbell, Ryan J., Keys, P H., Mathioudakis, M., Woeger, F., Schad, T. A., Tritschler, A., de Wijn, A. G., Smitha, H. N., Beck, C. A., Christian, D J., Jess, D. B., Erdelyi, R.
We present the first quiet Sun spectropolarimetric observations obtained with the Visible SpectroPolarimeter (ViSP) at the $4-$m Daniel K. Inouye Solar Telescope (DKIST). We recorded observations in a wavelength range that includes the magnetically s
Externí odkaz:
http://arxiv.org/abs/2309.05836
Publikováno v:
A&A 669, A144 (2023)
The current analysis is dedicated to a detailed investigation of the non-Local Thermodynamic Equilibrium (NLTE) effects influencing the formation of the Fe I 6173 A line, which is widely used by many instruments including the Helioseismic and Magneti
Externí odkaz:
http://arxiv.org/abs/2211.10236
Publikováno v:
A&A 653, A91 (2021)
The sunspot umbra harbors the coolest plasma on the solar surface due to the presence of strong magnetic fields. The routinely used atomic lines to observe the photosphere have weak signals in the umbra and are often swamped by molecular lines. This
Externí odkaz:
http://arxiv.org/abs/2107.01247
Publikováno v:
A&A 647, A46 (2021)
This paper forms the second part of our study on how the neglect of NLTE conditions in the formation of Fe I 6301.5 A and the 6302.5 A lines influences the atmosphere obtained by inverting their profiles in LTE. The main cause of NLTE effects is the
Externí odkaz:
http://arxiv.org/abs/2101.00506
Publikováno v:
A&A 633, A157 (2020)
Ultraviolet over-ionisation of iron atoms in the solar atmosphere leads to deviations in their level populations from the Saha-Boltzmann statistics. This causes their line profiles to form in Non-Local Thermodynamic Equilibrium (NLTE) conditions. Whi
Externí odkaz:
http://arxiv.org/abs/1912.07007
Akademický článek
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Publikováno v:
A&A 617, A128 (2018)
A wide variety of phenomena such as gentle but persistent brightening, dynamic slender features (~100 km), and compact (~1'') ultraviolet (UV) bursts are associated with the heating of the solar chromosphere. High spatio-temporal resolution is requir
Externí odkaz:
http://arxiv.org/abs/1807.01078