Bibcode
Lefebvre, S.; García, R. A.; Jiménez-Reyes, S. J.; Turck-Chièze, S.; Mathur, S.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 490, Issue 3, 2008, pp.1143-1149
Advertised on:
11
2008
Revista
Número de citas
41
Número de citas referidas
27
Descripción
Context: Below 1 mHz, the power spectrum of helioseismic velocity
measurements is dominated by the spectrum of convective motions
(granulation and supergranulation) and it is difficult to detect the
low-order acoustic modes and gravity modes. Aims: We attempt to
understand more clearly the behavior of solar granulation as a function
of observing height in the solar atmosphere and with magnetic activity
during solar cycle 23. Methods: We analyze the Power Spectral
Density (PSD) of eleven years of GOLF/SOHO velocity time series data
using a Harvey-type model to characterize the properties of the
convective motions in the solar oscillation power spectrum. We study the
evolution of the granulation with both altitude in the solar atmosphere
and solar activity. Results: We first demonstrate that the
traditional use of a Lorentzian profile to describe the envelope of the
p modes is unsuitable for GOLF data. To model properly the solar
spectrum, we must instead adopt a second Lorentzian profile. Secondly,
we show that the granulation clearly evolves with height in the
photosphere but does not present any significant variation with the
activity cycle.
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