Výsledky vyhledávání - "photosphere [Sun]"

Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes

Autor: David B. Jess, Shahin Jafarzadeh, Peter H. Keys, Marco Stangalini, Gary Verth, Samuel D. T. Grant

Publikováno v: Jess, D B, Jafarzadeh, S, Keys, P H, Stangalini, M, Verth, G & Grant, S D T 2023, ' Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes ', Living Reviews in Solar Physics, vol. 20, no. 1 . https://doi.org/10.1007/s41116-022-00035-6

Waves and oscillations have been observed in the Sun's atmosphere for over half a century. While such phenomena have readily been observed across the entire electromagnetic spectrum, spanning radio to gamma-ray sources, the underlying role of waves i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d439c2ead2f862a039ae04417b05761
http://arxiv.org/abs/2212.09788

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Solar oxygen abundance

Autor: Maria Bergemann, Andrey K. Belyaev, Yaroslav V. Voronov, Richard Hoppe, S. A. Yakovleva, Monika Ellwarth, Manuel A. Bautista, Mats Carlsson, Ekaterina Semenova, Ansgar Reiners, Lyudmila Mashonkina, Ahmad Nemer, Jorrit Leenaarts

Publikováno v: Bergemann, M, Hoppe, R, Semenova, E, Carlsson, M, Yakovleva, S A, Voronov, Y V, Bautista, M, Nemer, A, Belyaev, A K, Leenaarts, J, Mashonkina, L, Reiners, A & Ellwarth, M 2021, ' Solar oxygen abundance ', Monthly Notices of the Royal Astronomical Society, vol. 508, no. 2, pp. 2236-2253 . https://doi.org/10.1093/mnras/stab2160

Motivated by the controversy over the surface metallicity of the Sun, we present a re-analysis of the solar photospheric oxygen (O) abundance. New atomic models of O and Ni are used to perform Non-Local Thermodynamic Equilibrium (NLTE) calculations w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12dc907208d4f6ff047230d272373e17
https://doi.org/10.1093/mnras/stab2160

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Magnetized supersonic downflows in the chromosphere

Autor: Sowmya, K., Lagg, A., Solanki, S. K., Castellanos Durán, J. S.

Funding Information: Acknowledgements. We thank L. P. Chitta for useful discussions and J. de la Cruz Rodríguez for providing the data from 01 June 2015. This project has received funding from the European Research Council (ERC) under the European U

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______661::8b3590c1eaa4f6dc32ee3ba3359237f5
https://aaltodoc.aalto.fi/handle/123456789/115848

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Fan-shaped jet close to a light bridge

Autor: Y. Liu, G. P. Ruan, B. Schmieder, S. Masson, Y. Chen, J. T. Su, B. Wang, X. Y. Bai, Y. Su, W. Cao

On the Sun,jets in light bridges are frequently observed with high-resolution instruments.The respective roles played by convection and the magnetic field in triggering such jets are not yet clear.We report a small fan-shaped jet along a LB observed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::202175f5643eab258ee49bcf0659c191

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The solar photospheric silicon abundance according to CO5BOLD. Investigating line broadening, magnetic fields, and model effects

Autor: S. A. Deshmukh, H.-G. Ludwig, A. Kučinskas, M. Steffen, P. S. Barklem, E. Caffau, V. Dobrovolskas, P. Bonifacio

Publikováno v: Astronomy and astrophysics, Paris : EDP Sciences, 2022, vol. 668, art. no. A48, p. 1-25

In this work, we present a photospheric solar silicon abundance derived using CO5BOLD model atmospheres and the LINFOR3D spectral synthesis code. Previous works have differed in their choice of a spectral line sample and model atmosphere as well as t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::137d5aa1483b1a6d40e91b51cfb07aa6
https://repository.vu.lt/VU:ELABAPDB152735780&prefLang=en_US

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Reconstructing solar magnetic fields from historical observations:VIII. AIA 1600 Å contrast as a proxy of solar magnetic fields

Autor: Tähtinen, I. (Ismo), Virtanen, I. (I.I.), Pevtsov, A. A. (Alexei A.), Mursula, K. (Kalevi)

Context: The bright regions in the solar chromosphere and temperature minimum have a good spatial correspondence with regions of intense photospheric magnetic field. Bright regions are visible in different emission lines and parts of the continuum. T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______2423::47307745b41368907f05349e04a2d7e4
http://urn.fi/urn:nbn:fi-fe2022102763381

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Reconstructing solar magnetic fields from historical observations:IX. The photospheric magnetic field from 1915 to 1985

Autor: I. O. I. Virtanen, A. A. Pevtsov, L. Bertello, K. Mursula

Context. We apply our recently developed method to reconstruct synoptic maps of the photospheric magnetic field from observations of chromospheric plages and the magnetic polarity of sunspots. Here, we apply the method to an extended time interval fr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f1f9943b36e1887e5b034c0522c934e
http://urn.fi/urn:nbn:fi-fe2022122072748

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Autor: Andreas Lagg, Björn Löptien, M. van Noort, Sami K. Solanki

Context. It is unclear why there is a rather sharp boundary in sunspots between the umbra and the penumbra. Both regions exhibit magnetoconvection, manifesting in penumbral filaments in the penumbra and in umbral dots in the umbra. Aims. Here we comp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da506a640f8dbcbb27f708fd53ed40c1
http://arxiv.org/abs/2110.01352

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The chemical make-up of the Sun: A 2020 vision

Autor: Nicolas Grevesse, Martin Asplund, Anish M. Amarsi

The chemical composition of the Sun is a fundamental yardstick in astronomy, relative to which essentially all cosmic objects are referenced. We reassess the solar abundances of all 83 long-lived elements, using highly realistic solar modelling and s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47a4b6369227ce4c8d4c2d1021d4217e
http://arxiv.org/abs/2105.01661

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Finding the mechanism of wave energy flux damping in solar pores using numerical simulations

Autor: S. D. T. Grant, Caitlin A. Gilchrist-Millar, Julia M. Riedl, T. Van Doorsselaere, David B. Jess

Publikováno v: Riedl, J M, Gilchrist-Millar, C A, Van Doorsselaere, T, Jess, D B & Grant, S D T 2021, ' Finding the mechanism of wave energy flux damping in solar pores using numerical simulations ', Astronomy & Astrophysics, vol. 648, A77 . https://doi.org/10.1051/0004-6361/202040163

Context. Solar magnetic pores are, due to their concentrated magnetic fields, suitable guides for magnetoacoustic waves. Recent observations have shown that propagating energy flux in pores is subject to strong damping with height; however, the reaso

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68adb1e69522dc75d52404ffa8990d65
https://pure.qub.ac.uk/en/publications/finding-the-mechanism-of-wave-energy-flux-damping-in-solar-pores-using-numerical-simulations(8fa0709f-66ff-4658-9906-9b18ccd49c05).html

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