La Silla - Science Operation Department
HARPS solar spectra
HARPS daily sky solar spectra
Below is the list of the daily sky solar spectra ordered by date and the
observed flux ratio
between the fibre A and B measured both with the exposure meter and from the
extracted spectra at the wavelength of 550nm (order 111).
The data are acquired during the day, pointing to an "empty field" and
illuminating both fibres at the same time.
The 550nm flux is evaluated from (the square of) the SNR extracted by the
pipeline for order 111, for which the central wavelength is 551nm.
Measurement errors are evaluated from the scatter of the values in a sky
spectra series taken in one day and are around 5% peak to peak.
A hign S/N day sky solar spectrum provided by T. H. Dall (used in Dall et al. 2006, A&A,454, 341) can be downloaded from here (.fits).
The spectrum in fits format is a combination of about 30 spectra reaching a total S/N greater than 1000.
Collection of HARPS solar spectra
Solar spectra are obtained collecting the solar light reflected from
minor bodies or inactive satellites (Ganymede...).