Eliminating Multiple Scattering and Reflection of Light from the Underlying Surface from the Scattering Indicatrix

Pyaskovskaya-Fesenkova, E. V.

doi:10.1007/978-1-4684-7879-2_8

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“…While performing their well-known investigations of the solar constant at the Astrophysical Observatory of the Smithsonian Institution in 1902 -1932 Abbot and his colleagues measured the relative near-solar halo brightness as a criterion of atmospheric transmission stability. This method was also used by Kalitin [1930], and especially extensively used by Fesenkov [1933] and by Pyaskovskaya-Fesenkova [1957]. However, it was shown [Lifshits, 1985] that the near-Sun halo brightness is connected only with the scattering properties of the atmosphere and provides no information about a variation of atmospheric transmission with time.…”

Section: Bouguer-langley Methods Of Tod Determinationmentioning

confidence: 99%

A method to determine atmospheric optical depth using observations of direct solar radiation

Terez

2003

J. Geophys. Res.

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[1] The proposed method of atmospheric total optical depth (TOD) determination is based on the assumption that TOD is an arbitrary smooth function of time. Any small section of this function can be approximated by a linear relationship. A redundant system of Bouguer equations corresponding to n solar observations (where n > 3) can be written for each linear section. This procedure is successively applied to each section of the TOD curve and yields (N À n + 1) systems of Bouguer equations, where N is the total number of solar observations during a day. Solving these systems of Bouguer equations gives an extraatmospheric value of the solar flux and TOD curve parameters. The accuracy of the method depends on the accuracy of TOD curve approximation, i.e., on the character of TOD variation with time and a total number of observations during a day. The new method (named approximation by linear sections (APLS)) has been used for TOD investigations in the Crimea (a peninsula in Ukraine) since 1996. In comparison with the classical Bouguer-Langley method the new method allows us to achieve higher accuracy, when the conditions of astroclimate at the observational site are not very good and especially when the observations are carried out for a half day, i.e., only before noon or after.

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Section: Bouguer-langley Methods Of Tod Determinationmentioning

confidence: 99%

A method to determine atmospheric optical depth using observations of direct solar radiation

Terez

2003

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

Eliminating Multiple Scattering and Reflection of Light from the Underlying Surface from the Scattering Indicatrix

Cited by 1 publication

References 1 publication

A method to determine atmospheric optical depth using observations of direct solar radiation

A method to determine atmospheric optical depth using observations of direct solar radiation

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