J/A+A/617/A108 Sun velocities from GOLF instrument (Appourchaux+, 2018)
Searching for g modes: I. A new calibration of the GOLF instrument.
Appourchaux T., Boumier P., Leibacher J.W., Corbard T.
<Astron. Astrophys. 617, A108 (2018)>
=2018A&A...617A.108A 2018A&A...617A.108A (SIMBAD/NED BibCode)
ADC_Keywords: Sun ; Asteroseismology
Keywords: Sun: helioseismology - methods: data analysis
Abstract:
The recent claims of g-mode detection have restarted the search for
these potentially extremely important modes. These claims can be
reassessed in view of the different data sets available from the SoHO
instruments and ground-based instruments. We produce a new calibration
of the GOLF data with a more consistent p-mode amplitude and a more
consistent time shift correction compared to the time series used in
the past. The calibration of 22 years of GOLF data is done with a
simpler approach that uses only the predictive radial velocity of the
SoHO spacecraft as a reference. Using p modes, we measure and correct
the time shift between ground- and space-based instruments and the
GOLF instrument. The p-mode velocity calibration is now consistent to
within a few percent with other instruments. The remaining time shifts
are within ±5s for 99.8% of the time series.
Description:
Three time series as FITS file comprising 34797600 data points of GOLF
velocity in m/s sampled at 20 sec (no time provided). The time series
starts on April 11, 1996 0:00 UT and ends on April 10, 2018 23:59:40
UT. The time series are provided for the photomultipliers PM1 and PM2,
and their arithmetic average.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 82 3 List of fits files
fits/* . 3 Individual fits files
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See also:
J/A+A/390/717 : Solar Velocities of the Sun in 1989-99, IRIS++ (Salabert+ 2002)
J/A+A/581/A67 : Solar supergranular velocity profiles (Langfellner+, 2015)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- Nx [34797600] Number of points
10- 15 I6 Kibyte size Size of FITS file
17- 29 A13 --- FileName Name of FITS file, in subdirectory fits
31- 82 A52 --- Title Title of the FITS file
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Acknowledgements:
Thierry Appourchaux, Thierry.Appourchaux(at)ias.u-psud.fr
History:
25-Sep-2018: on-line version of the fits files
03-Oct-2018: corrected fits files (from author)
(End) Patricia Vannier [CDS] 04-Jul-2018