Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.3309s&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #33.09; Bulletin of the American Astronomical Society, Vol. 24, p.781
Astronomy and Astrophysics
Astronomy
Scientific paper
Three experiments are presently being developed for flight on the SOHO mission. The combination will provide a significant extension in capabilities from ground based observations. The VIRGO (Variability of solar IRadiance and Gravity Oscillations) and GOLF (Global Oscillations at Low Frequencies) experiments will provide increased sensitivity for the lowest frequency acoustic modes and should significantly lower the detection threshhold for gravity mode oscillations below that obtainable from present ground based efforts. GOLF and VIRGO will be able to observe modes from spherical harmonic degree l=0 to l=3 and to l=10 respectively. The SOI-MDI (Solar Oscillations Investigation - Michelson Doppler Imager) will allow observations to k = 2.2 Mm(-1) (l=1500) in the full disk mode and k = 6.5 Mm(-1) (equivalent degree l = 4500) in a high resolution mode. The combination of the 3 experiments will allow low frequency observations in velocity (both photospheric and chromospheric), total irradiance, broadband and narrow band irradiance, and limb shape. The intrinsic solar noise will be the limiting factor in sensitivity for both p-modes and g-modes. The three experiments will provide the capability to allow seismic probing of the solar interior from the center of the sun to depths of only a few Km. The three projects involve the joint efforts of people from at least 15 countries including 43 Investigators, more than 44 associated investigators, and the efforts of more than 100 on the technical teams.
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