NDLI: Comparative Solar Seeing and Scintillation Studies at the Fuxian Lake Solar Station

Content Provider	Springer Nature Link
Author	Zhong, Liu Beckers, Jacques M.
Copyright Year	2001
Abstract	Starting November 1999 we are carrying out simultaneous seeing observations with the Solar Differential Image Motion Monitor (S-DIMM) at the Fuxian Lake station of the Yunnan Observatory and a solar scintillometer of the type used in the recent site survey by one of us (Beckers et al., 1997). The purpose was to compare the two methods of assessing the daytime atmospheric seeing for a lake site. We report here the first results of this comparison. We find that the relation between the seeing as measured by the S-DIMM (the Fried parameter r $_{0}$) and the scintillation in the solar irradiance (σ$_{I}$) differs greatly from the relation found by Seykora (1993) for NSO/Sac Peak. We conclude that the σ$_{I}$ measurements give a good indication for the amount of near-Earth seeing but that they are a poor proxy for the total atmospheric seeing. We interpret the simultaneous (r $_{0}$, σ$_{I}$) observations in terms of an atmospheric seeing model and find good quantitative agreement with a model in which a fraction (α) of the seeing originated near the Earth (ground or water) and the rest (1−α) originates at higher layers. For lake sites α is small all day and the seeing is determined primarily by the refractive index variations at higher atmospheric layers. For land sites α is small in the early morning but rapidly increases as the day progresses, near-Earth seeing dominating there most of the time.
Starting Page	197
Ending Page	209
Page Count	13
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	198
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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