Studies of the sensitivity of p-mode oscillation frequencies to changing levels of solar activity

Physics

Scientific paper

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Solar Oscillations, Frequency Shifts

Scientific paper

Most studies of the solar cycle dependence of the p-mode oscillation frequencies have employed long-duration observing runs. Recently, Rhodes et al. (2002) have employed observing runs as short as three days in length using MDI data sets. The use of such short time series has resulted in a higher sensitivity (as measured in the slope of the linear regression of frequency differences upon the 10.7-cm flux differences) than did the use of long time series that averaged over regions varying widely in their levels of activity. Here we address the question of whether we can confirm this increased sensitivity by employing observing runs as short as three days in duration by using GONG+ data. We have employed GONG+ observations obtained during two different intervals in 2001 for these studies.

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