Bibcode
Pallé, P. L.; Regulo, C.; Roca Cortés, T.; Garcia, R. A.; Jiménez, A.; GOLF Team
Referencia bibliográfica
Structure and Dynamics of the Interior of the Sun and Sun-like Stars SOHO 6/GONG 98 Workshop Abstract, June 1-4, 1998, Boston, Massachusetts, p. 285
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1998
Número de citas
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Número de citas referidas
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Descripción
Although the occasional malfunction of rotating polarizing elements at
the beginning of the SOHO mission, which led to its stop, GOLF
instrument has been performing precise and continuous measurements over
the last two years. In this work, the nature of the actual GOLF
measurement, two monochromatic intensities Ib+ and
Ib- on the blue wing of the sodium doublet, is
investigated by comparing the temporal phase of the low degree (ell
<= 3) p-modes obtained from simultaneous data sets, either from SOHO
(GOLF in different operating modes) and from a well known ground-based
instrument (MARK-I). It is found that the signals are ``almost'' pure
velocity signals whose behaviour can be explained, amongst other
possible mechanisms, by a contamination of an intensity-like signal of
14% amplitude. Furthermore is it proved that the ratio (instrumental
velocity) as defined in MARK-I instrument (and by extension in IRIS one)
do have the same nature as the GOLF blue wing signal Xb.