Bibcode
Roca Cortes, T.; Gabriel, A. H.; Charra, J.; Grec, G.; Ulrich, R. K.; Turck-Chieze, S.; Robillot, J. M.; Boumier, P.; Régulo, C.; Baudin, F.; Lazrek, M.; Garcia, R. A.; Palle, P. L.; GOLF Team
Bibliographical reference
1st Advances in Solar Physics Euroconference. Advances in Physics of Sunspots, ASP Conf. Ser. Vol. 118., Eds.: B. Schmieder, J.C. del Toro Iniesta, & M. Vazquez, p. 249.
Advertised on:
0
1997
Citations
1
Refereed citations
1
Description
GOLF is a resonant scattering spectrophotomer which is flying onboard
SOHO. The first four months were dedicated to the commissioning and
calibration of the instrument which led to the conclusion of a
performance within design specification at system and subsystem levels.
However, mal-functioning of the polarising mechanisms at the end of this
period led to the adoption of an unplanned operating sequence in which
the mechanisms are no longer used. This photometric mode, which measures
at two points on the blue wing of the solar sodium lines, has very
little effect on the possibility of reaching the first objective of the
mission: measuring the solar spectrum of normal modes. However, the
precise calibration procedure to transform the actual measurements into
velocity is not trivial. The actual operating mode allows the obtention
of continuous data without interruptions which is producing
exceptionally noise-free p-mode spectra. Although this spectrum is being
studied, the data accumulated do not allow a positive detection of the
g-mode spectrum yet. On the other hand, the present mode of operation do
not show any indication of degradation which could limit its use for up
to 6 years or more of operation.