On the accuracy of the measurements of low-l solar acoustic oscillations

Details On the accuracy of the measurements of low-l solar acoustic oscillations On the accuracy of the measurements of low-l solar acoustic oscillations

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.317..569g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 317, Issue 3, pp. 569-580.

Astronomy and Astrophysics

Astronomy

4

Sun: Fundamental Parameters, Sun: Oscillations

Scientific paper

Using a 1154d 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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