515 research outputs found
Solar cycle induced variations in GONG p-mode frequencies and splittings
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 splitting coefficient is more prominent than the change in
. 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.Comment: Uses aastex, To appear in Astrophysical Journal, October 10, 2000
issu
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