On the accuracy of the measurements of low-ℓ solar acoustic oscillations |
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Authors: | V G Gavryusev E A Gavryuseva |
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Institution: | CAISMI CNR, Largo E. Fermi 5, 50125 Florence, Italy;Capodimonte Astronomical Observatory, via Moiariello 16, I-80131 Naples, Italy |
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Abstract: | Using a 1154 d long measurement of solar oscillations, obtained by the Global Oscillation Network Group from 1995 June 10 to 1998 August 6, we study the dependence of the accuracy of radial p-mode parameters on the duration of the observations. It is shown that relatively rare pulses of large power lead to the decrease of the accuracy achievable for a given duration of the observations and it is usually underestimated. The corresponding correction factor to the Libbrecht formula for a frequency accuracy estimation is provided. We have also investigated the influence of the solar activity on the mode parameters soon after the solar activity minimum. There is a clearly visible increase of the radial p-mode power in the beginning of the new solar cycle while the mode frequency variations are within the corresponding error bars. |
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Keywords: | Sun: fundamental parameters Sun: oscillations |
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