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Paper: What Solar Oscillation Tell Us About the Solar Minimum
Volume: 428, SOHO-23: Understanding a Peculiar Solar Minimum
Page: 57
Authors: Jain, K.; Tripathy, S. C.; Burtseva, O.; Hernández, I. G.; Hill, F.; Howe, R.; Kholikov, S.; Komm, R.; Leibacher, J.
Abstract: The availability of continuous helioseismic data for two consecutive solar minima has provided a unique opportunity to study the changes in the solar interior that might have led to this unusual minimum. We present preliminary analysis of intermediate-degree mode frequencies in the 3 mHz band during the current period of minimal solar activity and show that the mode frequencies are significantly lower than those during the previous activity minimum. Our analysis does not show any signature of the beginning of cycle 24 until the end of 2008. In addition, the zonal and meridional flow patterns inferred from inverting frequencies also hint at a delayed onset of a new cycle. The estimates of travel time are higher than the previous minimum confirming a relatively weak solar activity during the current minimum.
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