Calibrated GOLF data and derived data products

The GOLF velocity time series and several derived data products are available on the website of the CEA: Link

Data products, which were prepared  within the SpaceInn project as deliverable D4.5, are listed below. 

SOHO/GOLF p mode frequencies

The GOLF frequencies provided at the website irfu.cea.fr are part of the online material of the paper Salabert et al. (2015). They were extracted from one-year (365 days) GOLF time series, with a four-time overlap (91.25 days). A total of 69 non-independent one-year frequency tables covering 18 years of GOLF observations are then available at this external location. The zipped ascii files contain [radial order, angular degree, frequency in μHz, error_on_frequency in μHz]. It also contains an .info file with:

– column 1: the series index associated to the frequency table;

– column 2: the Julian Date of the starting date of each 365-day time series;

– column 3: the associated duty cycle in %;

– column 4: the corresponding radio flux averaged over the same 365-day periods.

Please cite Garcia et al. (2005) and Salabert et al. (2015) when publishing results using these data.

Also use the following in your acknowledgements in publication: “The GOLF instrument onboard SoHO is a cooperative effort of scientists, engineers, and technicians, to whom we are indebted. SoHO is a project of international collaboration between ESA and NASA.”

Follow this link to get to the website where you can download the data:  irfu.cea.fr

(The data available on this page is the Deliverable D4.5 within the SpaceInn project.)

SOHO/GOLF p mode frequency shifts

The GOLF frequency shifts provided here were obtained and analyzed in Salabert et al. (2015). They were extracted from one-year (365 days) GOLF time series, with a four-time overlap (91.25 days). They were calculated for 4 different frequency ranges: [1800-3790μHz]; the low-frequency range [1800-2450μHz]; the mid-frequency range [2450-3110μHz]; and the high-frequency range [3110-3790μHz]. Oscillation modes from each frequency range are sensitive to different layers in the solar sub-surface interior. The frequency shifts of modes at individual angular degree l=0, l=1, and l=2 are provided, as well as the mean frequency shifts for . We note that we did not use the l=3 mode because of its lower signal-to-noise ratio over most of the oscillation frequency range. However, we provide in the corresponding table the l=3 frequency shifts for the range [2450-3110muHz] as their SNR is sufficient enough to give reliable results.

The zipped ascii files contain the following columns:

[year, month, day, fshift_l0, e_fshift_l0, fshift_l1, e_fshift_l1, fshift_l2, e_fshift_l2 {, fshift_l3, e_fshift_l3}, radio_flux].

The frequency shifts and their 1σ uncertainties are given in nHz.

Please cite Salabert et al. (2015) when publishing results using these data, and the following acknowledgements: “The GOLF instrument onboard SoHO is a cooperative effort of scientists, engineers, and technicians, to whom we are indebted. SoHO is a project of international collaboration between ESA and NASA.”

Available data sets:

(The data available on this page is the Deliverable D4.5 within the SpaceInn project.)

Exploitation of Space Data for Innovative Helio- and Asteroseismology