Bibcode
DOI
Jiménez-Reyes, S. J.; Chaplin, W. J.; Elsworth, Y.; García, R. A.
Bibliographical reference
The Astrophysical Journal, Volume 604, Issue 2, pp. 969-976.
Advertised on:
4
2004
Journal
Citations
31
Refereed citations
21
Description
We present a detailed, comparative study of low angular degree solar
p-mode variations extracted by analyses of two sets of observational
data. These were collected by the ground-based Birmingham
Solar-Oscillations Network (BiSON) and the Global Oscillations at Low
Frequency (GOLF) instrument on board the ESA/NASA SOHO satellite. The
~5.5 yr period analyzed covers the complete rising phase of solar
activity cycle 23 (1996-2002). We find an excellent level of agreement
in the uncovered variations, indicating that the two data sets are
highly correlated and dominated by the same mode realization noise (the
signature of the stochastic forcing of the resonances). The results lend
further support to the surmise that changes in damping alone may account
for observed variations in mode power and damping. While significant
variations in peak asymmetry are uncovered in the near-continuous GOLF
set, a similar analysis of the BiSON database yields a null result. This
reflects the deleterious impact of its ground-based window function on
the precision with which the asymmetry can be determined. As such we are
unable to rule out the possibility that variations of magnitude similar
to those in GOLF may be present in the BiSON observations.