Open AccessOn the accuracy of the measurements of low‐ ℓ solar acoustic oscillations
Author(s) -
Gavryusev V. G.,
Gavryuseva E. A.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03656.x
Subject(s) - physics , oscillation (cell signaling) , mode (computer interface) , astrophysics , helioseismology , computational physics , optics , genetics , quantum mechanics , computer science , magnetic field , biology , operating system
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.