An analysis of 1983 observations of facular contrast with an extreme limb photometer

✍ Scribed by G. A. Chapman; B. Ziegler

• Publisher: Springer
• Year: 1996
• Tongue: English
• Weight: 681 KB
• Volume: 168
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00148054

✦ Synopsis

Analysis of faeular contrast A I/LI.,~ I:rom Extreme Limb Pholometer (ELP) dala of the Stllllnlcr Of 1983 yield a mean contrast of 0.91 4-0.19% and 1.57 • 0.16% for apeltt~rcs I and 2 located at t s --0.198 and at / s ----0. II1, respectively. The ratio of the mean contrast in the outer aperture (closer to the limb) to that of lhe inner one is 1.71 4-0.40, indicating an increase in the mean faeular contrast loward the limb. This result is in agreement with observations made in 1975, 1979, and 1982. The errors arc dominated by the random presence of solar active regions. The cornbincd rcsulls from all seasons follow an aplm)ximately p " ~ curve. Facular excess solar ()blaleness signals for 1983 arc 33.8 4-6.6 arc ms and 16.5 4-2..I arc ms for EI_,P apt;rtures I and 2, respectively, in reasonable agreement with Ihe 1983 excess solar oblateness resulls of l)icke, Kuhn, and I.ibbrecht (1985).