GOLF-NG spectrometer, a space prototype for studying the dynamics of the deep solar interior

Turck‐Chièze, S.; Carton, Pierre-Henri; Ballot, J.; Barrière, Jean-Christophe; Daniel-Thomas, P.; Delbart, A.; Desforges, D.; García, Rafael A.; Granelli, Rémi; Mathur, S.; Nunio, F.; Piret, Y.; Pallé, P. L.; Jiménez, A.; Jiménez-Reyes, S. J.; Robillot, J. M.; Fossat, E.; Eff-Darwich, A.; Gelly, B.

doi:10.1016/j.asr.2005.09.033

Cited by 29 publications

(21 citation statements)

References 23 publications

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“…A corollary is that searches for global g-modes and so-called "chromosphere seismology" using full-disk resonance-cell sampling of the Na line as with GOLF-NG (e.g., Turck-Chièze et al 2006;Salabert et al 2009) will suffer noise from reversed granulation just as classical helioseismology suffers noise from granulation. Magnetic concentrations contribute much noise (literally) by their shocks.…”

Section: Discussionmentioning

confidence: 99%

Quiet-Sun imaging asymmetries in Na I D₁compared with other strong Fraunhofer lines

Rutten

Leenaarts

Voort

et al. 2011

A&A

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Imaging spectroscopy of the solar atmosphere using the Na i D 1 line yields marked asymmetry between the blue and red line wings: sampling a quiet-Sun area in the blue wing displays reversed granulation, whereas sampling in the red wing displays normal granulation. The Mg i b 2 line of comparable strength does not show this asymmetry, nor does the stronger Ca ii 8542 Å line. We demonstrate the phenomenon with near-simultaneous spectral images in Na i D 1 , Mg i b 2 , and Ca ii 8542 Å from the Swedish 1-m Solar Telescope. We then explain it with line-formation insights from classical 1D modeling and with a 3D magnetohydrodynamical simulation combined with NLTE spectral line synthesis that permits detailed comparison with the observations in a common format. The cause of the imaging asymmetry is the combination of correlations between intensity and Dopplershift modulation in granular overshoot and the sensitivity to these of the steep profile flanks of the Na i D 1 line. The Mg i b 2 line has similar core formation but much wider wings due to larger opacity buildup and damping in the photosphere. Both lines obtain marked core asymmetry from photospheric shocks in or near strong magnetic concentrations, less from higher-up internetwork shocks that produce similar asymmetry in the spatially averaged Ca ii 8542 Å profile.

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Section: Discussionmentioning

confidence: 99%

Quiet-Sun imaging asymmetries in Na I D₁compared with other strong Fraunhofer lines

Rutten

Leenaarts

Voort

et al. 2011

A&A

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show abstract

“…Simultaneous observations at several heights in the atmosphere are certainly a desirable data product (e.g., from new instrumentation, such as GOLF-NG; see Turck-Chièze et al 2006). In the meantime, it should be possible to place constraints on contributions to the asymmetry variation that come from other effects, which can be tested with Monte Carlo simulations of artificial data.…”

Section: Discussionmentioning

confidence: 99%

On the Variation of the Peak Asymmetry of Low‐ℓ SolarpModes

Jiménez-Reyes

Chaplin

Elsworth

et al. 2007

ApJ

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The resonant peaks of solar p modes show small amounts of asymmetry in frequency. Here, we use five independent sets of contemporaneous data, collected over a '8 yr period, to investigate whether peak asymmetry in low angular degree p modes changes over the solar activity cycle. Three of the data sets are from instruments on board the ESA /NASA SOHO spacecraft (GOLF, MDI, and VIRGO/SPM ); and two are from ground-based networks (BiSON and GONG). Evidence for variation in asymmetry, well correlated with the activity cycle, is uncovered in the GOLF and BiSON Doppler velocity data. Suggestions of a similar trend are present in the GONG Doppler velocity data. Apparent changes in the MDI Doppler velocity data are somewhat less significant. Meanwhile, analysis of the SPM intensity data failed to uncover any evidence for significant change of the asymmetry parameter.

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“…On the other hand, we have shown how classical seismic observables are affected by the internal dynamical processes that will allow to put constraints on our modelling from the comparison with the observations. Thus, with the first light of COROT, the preparation of KEPLER, SOHO and forthcoming helioseismic space instrument such as GOLF-NG on DynaMICCS project (Turck-Chièze et al 2005, Turck-Chièze et al 2006, we are now entering in a new exciting period of the story of stellar evolution where we hope to be able to obtain a dynamical vision of the Hertzsprung-Russel diagram with the support of helio and asteroseismology.…”

Section: Resultsmentioning

confidence: 99%

Advances in Secular Magnetohydrodynamics of Stellar Interiors Dedicated to Asteroseismic Spatial Missions

Mathis

Eggenberger

Decressin

et al. 2007

EAS Publications Series

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Abstract. With the first light of COROT, the preparation of KEPLER and the future helioseismology spatial projects such as GOLF-NG, a coherent picture of the evolution of rotating stars from their birth to their death is needed. We describe here the modelling of the macroscopic transport of angular momentum and matter in stellar interiors that we have undertaken to reach this goal. First, we recall in detail the dynamical processes that are driving these mechanisms in rotating stars and the theoretical advances we have achieved. Then, we present our new results of numerical simulations which allow us to follow in 2D the secular hydrodynamics of rotating stars, assuming that anisotropic turbulence enforces a shellular rotation law. Finally, we show how this work is leading to a dynamical vision of the Hertzsprung-Russel diagram with the support of asteroseismology and helioseismology, seismic observables giving constraints on the modelling of the internal transport and mixing processes. In conclusion, we present the different processes that should be studied in the next future to improve our description of stellar radiation zones.

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GOLF-NG spectrometer, a space prototype for studying the dynamics of the deep solar interior

Cited by 29 publications

References 23 publications

Quiet-Sun imaging asymmetries in Na I D₁compared with other strong Fraunhofer lines

Quiet-Sun imaging asymmetries in Na I D₁compared with other strong Fraunhofer lines

On the Variation of the Peak Asymmetry of Low‐ℓ SolarpModes

Advances in Secular Magnetohydrodynamics of Stellar Interiors Dedicated to Asteroseismic Spatial Missions

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GOLF-NG spectrometer, a space prototype for studying the dynamics of the deep solar interior

Cited by 29 publications

References 23 publications

Quiet-Sun imaging asymmetries in Na I D1compared with other strong Fraunhofer lines

Quiet-Sun imaging asymmetries in Na I D1compared with other strong Fraunhofer lines

On the Variation of the Peak Asymmetry of Low‐ℓ SolarpModes

Advances in Secular Magnetohydrodynamics of Stellar Interiors Dedicated to Asteroseismic Spatial Missions

Contact Info

Product

Resources

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Quiet-Sun imaging asymmetries in Na I D₁compared with other strong Fraunhofer lines

Quiet-Sun imaging asymmetries in Na I D₁compared with other strong Fraunhofer lines