High-Precision Measurements of the Solar Diameter and Oblateness by the Solar Disk Sextant (SDS) Experiment |
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| Authors: | A Egidi B Caccin S Sofia W Heaps W Hoegy L Twigg |
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| Institution: | (1) Dipartimento di Fisica, Università di Roma “Tor Vergata”, Rome, Italy;(2) Department of Astronomy, Yale University, New Haven, CT, U.S.A.;(3) The Instrument Technology Center, NASA/GSFC, Greenbelt, MD, 20771, U.S.A.;(4) Laboratory for Atmospheres, NASA/GSFC, Greenbelt, MD, 20771, U.S.A.;(5) Science Systems and Applications Inc., Lanham, MD, 20706, U.S.A. |
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| Abstract: | We reduce and analyze, in a uniform way, all of the data obtained by the Solar Disk Sextant (SDS) experiment, concerning high-precision
measurements of the solar radius and oblateness, in the bandwidth 590 {–} 670 nm, made onboard stratospheric balloons during
a series of flights carried out in 1992, 1994, 1995, and 1996. The measured radius value appears anti-correlated with the
level of solar activity, ranging from about 959.5 to 959.7 arcsec. Its variation from year to year is outside the error range,
which is mostly due to a systematic diurnal behavior, particularly evident in the 1996 flight. The oblateness shows an analogous
temporal behavior, ranging from about (4.3 to 10.3) × 10−6.
We regret that Prof. Caccin died on June 19, 2004. |
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