Solar cycle induced variations in GONG p-mode frequencies and splittings

Abstract

We have analysed the recently available GONG p-mode frequencies and splitting coefficients for a period of three and half years, including the rapidly rising phase of solar cycle 23. The analysis of mean frequency shift with different activity indices shows that the shift is equally correlated with both magnetic and radiative indices. During the onset of the new cycle 23, we notice that the change in $b_4$ splitting coefficient is more prominent than the change in $b_2$. We have estimated the solar rotation rate with varying depth and latitude. In the equatorial region, the rotation first increases with depth and then decreases, while an opposite behaviour is seen in the polar region. We also find a small but significant temporal variation in the rotation rate at high latitudes.

Uses aastex, To appear in Astrophysical Journal, October 10, 2000 issue

References in corpus (1)

• GONG p-mode frequency changes with solar activity

Cited by in corpus (8)

• The quasi-biennial periodicity as a window on the solar magnetic dynamo configuration
• Solar Activity Phases and Intermediate-degree Mode Frequencies
• Analysis of the solar cycle and core rotation using 15 years of Mark-I observations:1984-1999. I. The solar cycle
• A New Challenge to Solar Dynamo Models from Helioseismic Observations: The Latitudinal Dependence of the Progression of the Solar Cycle
• What Seismic Minimum Reveals About Solar Magnetism Below the Surface?
• Seismic comparison of the 11 and 2 yr cycle signatures in the Sun
• Spectral Behavior of Solar Oscillations Modulated by Magnetic Variation
• How good are the predictions for oscillation frequencies