Spectropolarimetrically accurate magnetohydrostatic sunspot model for forward modelling in helioseismology

Damien Przybylski, Sergiy Shelyag, Paul Stuart Cally

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

We present a technique to construct a spectropolarimetrically accurate magnetohydrostatic model of a large-scale solar magnetic field concentration, mimicking a sunspot. Using the constructed model we perform a simulation of acoustic wave propagation, conversion, and absorption in the solar interior and photosphere with the sunspot embedded into it. With the 6173 ? magnetically sensitive photospheric absorption line of neutral iron, we calculate observable quantities such as continuum intensities, Doppler velocities, as well as the full Stokes vector for the simulation at various positions at the solar disk, and analyze the influence of non-locality of radiative transport in the solar photosphere on helioseismic measurements. Bisector shapes were used to perform multi-height observations. The differences in acoustic power at different heights within the line formation region at different positions at the solar disk were simulated and characterized. An increase in acoustic power in the simulated observations of the sunspot umbra away from the solar disk center was confirmed as the slow magnetoacoustic wave.
Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalThe Astrophysical Journal
Volume807
Issue number1
DOIs
Publication statusPublished - 2015

Keywords

  • Sun: helioseismology
  • Sun: magnetic fields
  • Sun: oscillations
  • sunspots

Cite this

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title = "Spectropolarimetrically accurate magnetohydrostatic sunspot model for forward modelling in helioseismology",
abstract = "We present a technique to construct a spectropolarimetrically accurate magnetohydrostatic model of a large-scale solar magnetic field concentration, mimicking a sunspot. Using the constructed model we perform a simulation of acoustic wave propagation, conversion, and absorption in the solar interior and photosphere with the sunspot embedded into it. With the 6173 ? magnetically sensitive photospheric absorption line of neutral iron, we calculate observable quantities such as continuum intensities, Doppler velocities, as well as the full Stokes vector for the simulation at various positions at the solar disk, and analyze the influence of non-locality of radiative transport in the solar photosphere on helioseismic measurements. Bisector shapes were used to perform multi-height observations. The differences in acoustic power at different heights within the line formation region at different positions at the solar disk were simulated and characterized. An increase in acoustic power in the simulated observations of the sunspot umbra away from the solar disk center was confirmed as the slow magnetoacoustic wave.",
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author = "Damien Przybylski and Sergiy Shelyag and Cally, {Paul Stuart}",
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Spectropolarimetrically accurate magnetohydrostatic sunspot model for forward modelling in helioseismology. / Przybylski, Damien; Shelyag, Sergiy; Cally, Paul Stuart.

In: The Astrophysical Journal, Vol. 807, No. 1, 2015, p. 1-11.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Spectropolarimetrically accurate magnetohydrostatic sunspot model for forward modelling in helioseismology

AU - Przybylski, Damien

AU - Shelyag, Sergiy

AU - Cally, Paul Stuart

PY - 2015

Y1 - 2015

N2 - We present a technique to construct a spectropolarimetrically accurate magnetohydrostatic model of a large-scale solar magnetic field concentration, mimicking a sunspot. Using the constructed model we perform a simulation of acoustic wave propagation, conversion, and absorption in the solar interior and photosphere with the sunspot embedded into it. With the 6173 ? magnetically sensitive photospheric absorption line of neutral iron, we calculate observable quantities such as continuum intensities, Doppler velocities, as well as the full Stokes vector for the simulation at various positions at the solar disk, and analyze the influence of non-locality of radiative transport in the solar photosphere on helioseismic measurements. Bisector shapes were used to perform multi-height observations. The differences in acoustic power at different heights within the line formation region at different positions at the solar disk were simulated and characterized. An increase in acoustic power in the simulated observations of the sunspot umbra away from the solar disk center was confirmed as the slow magnetoacoustic wave.

AB - We present a technique to construct a spectropolarimetrically accurate magnetohydrostatic model of a large-scale solar magnetic field concentration, mimicking a sunspot. Using the constructed model we perform a simulation of acoustic wave propagation, conversion, and absorption in the solar interior and photosphere with the sunspot embedded into it. With the 6173 ? magnetically sensitive photospheric absorption line of neutral iron, we calculate observable quantities such as continuum intensities, Doppler velocities, as well as the full Stokes vector for the simulation at various positions at the solar disk, and analyze the influence of non-locality of radiative transport in the solar photosphere on helioseismic measurements. Bisector shapes were used to perform multi-height observations. The differences in acoustic power at different heights within the line formation region at different positions at the solar disk were simulated and characterized. An increase in acoustic power in the simulated observations of the sunspot umbra away from the solar disk center was confirmed as the slow magnetoacoustic wave.

KW - Sun: helioseismology

KW - Sun: magnetic fields

KW - Sun: oscillations

KW - sunspots

UR - http://iopscience.iop.org/0004-637X/807/1/20/pdf/0004-637X_807_1_20.pdf

U2 - 10.1088/0004-637X/807/1/20

DO - 10.1088/0004-637X/807/1/20

M3 - Article

VL - 807

SP - 1

EP - 11

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

ER -