Solar Oscillation Frequency Changes on Time Scales of Nine Days

Abstract

We establish that global solar p-mode frequencies can be measured with sufficient precision on time scales as short as nine days to detect activity-related shifts. Using ten years of GONG data, we report that mode-mass and error-weighted frequency shifts derived from nine days are significantly correlated with the strength of solar activity and are consistent with long duration measurements from GONG and the MDI/SOHO instrument. However, the correlation varies from year to year and appears to be a complex phenomena. For the short-duration observations, the analysis indicates a higher sensitivity to activity. We also find that magnetic indices behave differently in the rising and falling phases of the activity cycle.

Major changes, additional figures and tables. Accepted for publication in Solar physics

References in corpus (2)

• GONG p-mode frequency changes with solar activity
• Analysis of hysteresis effect in p mode frequency shifts and solar activity indices

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