Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...364..816u&link_type=abstract
Astronomy and Astrophysics, v.364, p.816-828 (2000)
Astronomy and Astrophysics
Astrophysics
5
Sun: Atmosphere, Sun: Oscillations
Scientific paper
A step in the analysis of the data from the GOLF (Global Oscillations at Low Frequency) instrument on SOHO (SOlar and Heliospheric Observatory, an ESA/NASA Mission) involves the calculation of the sensitivity of the GOLF signal to the velocity at each point on the solar surface. A successful model of this sort will permit the intercomparison of data from the spatially resolved MDI (Michelson Doppler Imager) instrument to the integrated sunlight GOLF signal. This paper presents a formalism and data adequate for the calculation of the required sensitivity functions. An important complication in the treatment of the GOLF data is the need to include both the sodium D_1 and D_2 lines. The latter is subject to contamination by telluric absorption and is difficult to observe from ground-based systems. This paper presents some telluric corrected data for the D_2 line. The uniform displacement of the solar surface is an important special case which is observed directly by GOLF. The comparison of the appropriate integral of the sensitivity function derived from the ground-based profiles to that derived from GOLF data shows that the model can successfully reproduce important properties of the GOLF instrument function. A formalism and some data are presented which allow the calculation of the sensitivity of the GOLF instrument to magnetic effects. At present this approach takes a form in which the full magnetic effect is approximated by the magnetic effect on the sodium D_1 line alone.
Boumier Patrick
Garcia Rafael A.
Henney Carl John
Robillot Jean Maurice
Roca Cortes Teodora
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