Physics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sohi.rept...13g&link_type=abstract
In ESA, The SOHO Mission. Scientific and Technical Aspects of the Instruments p 13-17 (SEE N90-13302 04-92)
Physics
1
Plasma Oscillations, Soho Mission, Solar Interior, Solar Magnetic Field, Solar Oscillations, Calibrating, Low Frequencies, Resonance Scattering, Sodium Vapor
Scientific paper
The GOLF (global oscillations at low frequencies) SOHO (solar heliospheric observatory) mission is described. It aims to study the internal structure of the Sun by measuring the spectrum of free global oscillations. GOLF will measure both p and g mode oscillations, with emphasis on low order long period waves which penetrate the solar core. The instrument aims to measure frequencies between 10-7 and 6 10-3 Hz, with a sensitivity of 1 mm/s. The method involves an extension to space of the ground based technique for measuring the mean line-of-sight velocity of the solar surface. A sodium vapor resonance scattering filter is used in a longitudinal magnetic field to sample the two wings of the solar absorption line. The use of a modulating magnetic field provides a continuous internal calibration of the sensitivity. By adding an additional rotating polarizer, measurements are also made of the average solar magnetic field. Efforts are made to correct the data for the spurious effects caused by solar magnetic active regions.
Bocchia R.
Bonnet Roger-Maurice
Cesarsky Catherine
Christensen-Dalsgaard Joergen
Dame Luc
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