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Solar Physics

, Volume 235, Issue 1–2, pp 407–418 | Cite as

High-Precision Measurements of the Solar Diameter and Oblateness by the Solar Disk Sextant (SDS) Experiment

  • A. Egidi
  • B. Caccin
  • S. Sofia
  • W. Heaps
  • W. Hoegy
  • L. Twigg
Article

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.

Keywords

Solar Activity Temporal Behavior Error Range Solar Disk Solar Radius 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • A. Egidi
    • 1
  • B. Caccin
    • 1
  • S. Sofia
    • 2
  • W. Heaps
    • 3
  • W. Hoegy
    • 4
  • L. Twigg
    • 5
  1. 1.Dipartimento di FisicaUniversità di Roma “Tor Vergata”RomeItaly
  2. 2.Department of AstronomyYale UniversityNew HavenU.S.A.
  3. 3.The Instrument Technology Center, NASA/GSFCGreenbeltU.S.A.
  4. 4.Laboratory for Atmospheres, NASA/GSFCGreenbeltU.S.A.
  5. 5.Science Systems and Applications Inc.LanhamU.S.A.

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