Differential Rotation and Dynamics of the Solar Interior

  title={Differential Rotation and Dynamics of the Solar Interior},
  author={Michael J. Thompson and J. Toomre and E. R. Anderson and H. M. Antia and Gabrielle Berthomieu and D. Burtonclay and Shashikumar M. Chitre and J. Christensen-Dalsgaard and Thierry Corbard and Marc L. Derosa and Christopher R. Genovese and Douglas O. Gough and Deborah A. Haber and J. W. Harvey and Frank Hill and Roger T. Howe and Sylvain Gereon Korzennik and Alexander G. Kosovichev and John Leibacher and Frank P Pijpers and Janine Provost and Edward J. Rhodes and Jesper Schou and Takashi Sekii and Philip B. Stark and P. R. Wilson},
  pages={1300 - 1305}
Splitting of the sun's global oscillation frequencies by large-scale flows can be used to investigate how rotation varies with radius and latitude within the solar interior. The nearly uninterrupted observations by the Global Oscillation Network Group (GONG) yield oscillation power spectra with high duty cycles and high signal-to-noise ratios. Frequency splittings derived from GONG observations confirm that the variation of rotation rate with latitude seen at the surface carries through much of… Expand

Topics from this paper

Temporal variations of the rotation rate in the solar interior
The temporal variations of the rotation rate in the solar interior are studied using frequency splittings from Global Oscillations Network Group (GONG) data obtained during the period 1995-1999. WeExpand
Dynamic variations at the base of the solar convection zone
Changes in the rotation of the sun near the base of its convective envelope are detected, including a prominent variation with a period of 1.3 years at low latitudes, which may generate the 22-year cycles of magnetic activity. Expand
Temporal Variations of the Solar Rotation Rate at High Latitudes
Frequency splitting coefficients from Global Oscillation Network Group and Michelson Doppler Imager observations covering the period 1995-2001 are used to study temporal variations in the solarExpand
GONG Observations of Solar Surface Flows
Rotation profiles averaged over 27-day rotations of the sun reveal the torsional oscillation signal—weak, jetlike features, with amplitudes of 5 meters per second, that are associated with the sunspot latitude activity belts. Expand
The acoustic and magnetic solar cycle
The frequency variation of global modes provides information about the solar structure and the rotation rate of the solar interior. The solar-cycle variation of the rotation rate, the so-calledExpand
Solar Interior Rotation and its Variation
This article surveys the development of observational understanding of the interior rotation of the Sun and its temporal variation over approximately forty years, starting with the 1960s attempts toExpand
Data obtained by the GONG and MDI instruments over the last 7 years are used to study how solar dynamics—both rotation and other large scale flows—has changed with time. In addition to the well-knownExpand
Helioseismic Studies of Differential Rotation in the Solar Envelope by the Solar Oscillations Investigation Using the Michelson Doppler Imager
The splitting of the frequencies of the global resonant acoustic modes of the Sun by large-scale flows and rotation permits study of the variation of angular velocity Ω with both radius and latitudeExpand
Solar Convection Zone Dynamics
A comprehensive understanding of the solar magnetic cycle requires detailed modeling of the solar interior including the maintenance and variation of large scale flows (differential rotation andExpand
Deeply Penetrating Banded Zonal Flows in the Solar Convection Zone.
It is established, using complementary helioseismic observations over 4 yr from the GONG network and from the MDI instrument on board SOHO, that the banded flows are not merely a near-surface phenomenon: rather, they extend downward at least 60 Mm and thus are evident over a significant fraction of the nearly 200 Mm depth of the solar convection zone. Expand


Observations of Time Variation in the Sun's Rotation
Observations of solar p-mode frequency splittings obtained at Big Bear Solar Observatory in 1986 and during 1988-90 reveal small (∼1 percent) changes in the sun's subsurface angular velocity withExpand
Depth and latitude dependence of solar rotation
A 15-day time series of spatially resolved full-disk Doppler observations is used to measure the dependence of p-mode oscillation frequencies on the mode azimuthal order m. This dependence may beExpand
Rotational frequency splitting of solar oscillations
Prograde and retrograde sectoral oscillations of the Sun have been observed so as to determine frequency differences produced by rotation. Oscillations in the frequency range 2.1–3.7 mHz and withExpand
Solar rotation as a function of depth and latitude
A 5-day series of two-dimensional velocity images of the Sun is analysed to yield frequencies of solar p-mode oscillations with degrees between 8 and 50, with all azimuthal orders for each degree.Expand
Differential rotation and magnetic torques in the interior of the Sun
The frequencies of solar oscillations can be measured with extreme precision and 5-min oscillations reveal the internal structure of the Sun1–5. In particular, measurements of rotational splitting4Expand
Internal rotation of the Sun
The frequency difference between prograde and retrograde sectoral solar oscillations is analysed to determine the rotation rate of the solar interior, assuming no latitudinal dependence. Much of theExpand
Slow rotation of the Sun's interior
THE rotation of the Sun is not that of a rigid body; at its surface, the gas near the poles has a lower angular velocity than that near the equator1. This latitudinal variation persists to the baseExpand
Depth and latitude dependence of the solar internal angular velocity
One of the design goals for the dedicated helioseismology observing state located at Mount Wilson Observatory was the measurement of the internal solar rotation using solar p-mode oscillations. InExpand
Inferring the sun's internal angular velocity from observed p-mode frequency splittings
The sun's internal solar velocity Omega is studied as a function of latitude and radius using the solar oscillation data of Brown and Morrow (1987). An attempt is made to separate robust inferencesExpand
Angular momentum transport and dynamo action in the sun - Implications of recent oscillation measurements
The implications of a newly proposed picture of the sun's internal rotation (Brown et al., 1989; Morrow, 1988) for the distribution and transport of angular momentum and for the solar dynamo areExpand