Helioseismic Measurement of Solar Torsional Oscillations

Vorontsov, S. V.; Christensen‐Dalsgaard, J.; Schou, J.; Страхов, В. Н.; Thompson, M. J.

doi:10.1126/science.1069190

Cited by 195 publications

(162 citation statements)

References 8 publications

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“…The depth of these evolving zonal flows is not yet established. However, there are indications that they may be persistent through most of the convection zone, at least, at high latitudes [128]. The physical mechanism is not understood.…”

Section: Results For Solar Rotationmentioning

confidence: 99%

“…b) Variations of the zonal flows with depth and latitude during the first 4 years after the solar minimum. [128] flows at the outer (relative to the equator) part of the faster bands. Thus, the torsional flows are an important key to understanding the solar dynamo, and one of the challenges is to establish their precise depth and detect corresponding variations in the thermodynamic structure of the convection zone.…”

Section: Results For Solar Rotationmentioning

confidence: 99%

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Advances in Global and Local Helioseismology: An Introductory Review

Kosovichev

2011

The Pulsations of the Sun and the Stars

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Abstract. Helioseismology studies the structure and dynamics of the Sun's interior by observing oscillations on the surface. These studies provide information about the physical processes that control the evolution and magnetic activity of the Sun. In recent years, helioseismology has made substantial progress towards the understanding of the physics of solar oscillations and the physical processes inside the Sun, thanks to observational, theoretical and modeling efforts. In addition to the global seismology of the Sun based on measurements of global oscillation modes, a new field of local helioseismology, which studies oscillation travel times and local frequency shifts, has been developed. It is capable of providing 3D images of the subsurface structures and flows. The basic principles, recent advances and perspectives of global and local helioseismology are reviewed in this article.

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Section: Results For Solar Rotationmentioning

confidence: 99%

Section: Results For Solar Rotationmentioning

confidence: 99%

Advances in Global and Local Helioseismology: An Introductory Review

Kosovichev

2011

The Pulsations of the Sun and the Stars

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“…This change of symmetry may be due to a change between the spin of the outer layers of the sun and the dip direction, and, in turn, it may be related to the episode change in 1923. The possible role of torsional oscillations in explaining solar variability might be considered in this connection (Snodgrass and Howard, 1985;Vorontsov et al, 2002).…”

Section: The Solar Origins Of Terrestrial Temperature Variationsmentioning

confidence: 99%

Quantifying and specifying the solar influence on terrestrial surface temperature

Jager

Duhau

Geel

2010

Journal of Atmospheric and Solar-Terrestrial Physics

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tThis investigation is a follow-up of a paper in which we showed that both major magnetic components of the solar dynamo, viz. the toroidal and the poloidal ones, are correlated with average terrestrial surface temperatures. Here, we quantify, improve and specify that result and search for their causes. We studied seven recent temperature files. They were smoothed in order to eliminate the Schwabe-type (11 years) variations. While the total temperature gradient over the period of investigation (1610-1970) is 0.087 1C/century; a gradient of 0.077 1C/century is correlated with the equatorial (toroidal) magnetic field component. Half of it is explained by the increase of the Total Solar Irradiance over the period of investigation, while the other half is due to feedback by evaporated water vapour. A yet unexplained gradient of À 0.040 1C/century is correlated with the polar (poloidal) magnetic field. The residual temperature increase over that period, not correlated with solar variability, is 0.051 1C/century. It is ascribed to climatologic forcings and internal modes of variation.We used these results to study present terrestrial surface warming. By subtracting the above-mentioned components from the observed temperatures we found a residual excess of 0.311 in 1999, this being the triangularly weighted residual over the period 1990-2008. We show that solar forcing of the ground temperature associated with significant feedback is a regularly occurring feature, by describing some well observed events during the Holocene.

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“…To search for such variations, the data are analyzed in segments of a few months; the average over time of these results, as a function of (ro,0 0 ) is computed, and the residuals obtained by subtracting the average from the inferred rotation rate for each segment are investigated. In the outer parts of the convection zone the results show bands of slightly more rapid and slower rotation, often described as zonal flows, which converge towards the solar equator as time progresses, with an apparent Ll-year periodicity (e.g., Antia & Basu 2000;Howe et al 2000a;Vorontsov et al 2002). show that these variations extend through a substantial fraction of the convection zone.…”

Section: The Solar Internal Rotationmentioning

confidence: 99%

The Internal Solar Rotation from Helioseismology

Christensen‐Dalsgaard

2004

Symp. - Int. Astron. Union

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Helioseismology has provided detailed inferences about the internal rotation of the Sun, and hence stringent constraints on any attempt to understand the properties and evolution of stellar rotation. Here I briefly discuss the techniques used in the analysis and review the results that have been obtained. Strikingly, these results are markedly different from the predictions made before the helioseismic data became available, emphasizing the difficulties in the modelling of phenomena as complex as stellar internal rotation.

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Helioseismic Measurement of Solar Torsional Oscillations

Cited by 195 publications

References 8 publications

Advances in Global and Local Helioseismology: An Introductory Review

Advances in Global and Local Helioseismology: An Introductory Review

Quantifying and specifying the solar influence on terrestrial surface temperature

The Internal Solar Rotation from Helioseismology

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