Absolute Solar Spectra 3.5–5.5 Microns. I. Experimental Spectra for Altitude Range 0–15 km

C. B. Farmer; S. J. Todd

doi:10.1364/AO.3.000453

Applied Optics
Vol. 3,
Issue 4,
pp. 453-458
(1964)
•https://doi.org/10.1364/AO.3.000453

Absolute Solar Spectra 3.5–5.5 Microns. I. Experimental Spectra for Altitude Range 0–15 km

C. B. Farmer and S. J. Todd

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C. B. Farmer and S. J. Todd, "Absolute Solar Spectra 3.5–5.5 Microns. I. Experimental Spectra for Altitude Range 0–15 km," Appl. Opt. 3, 453-458 (1964)

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Abstract

A survey has been made of the available solar spectra for all altitudes, and selected data reduced to absolute intensity form with uniform resolution. The work covers the spectral region from 3.5 μ to 5.5 μ, and values of apparent spectral brightness temperature for the sun in this band are also given.

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Source of data (latitude)	Altitude (km)	Local time and zenith angle	Air mass	Wavelength band (μ)	Spectral slit-width (μ)	Comments
NOL	0	4 Apr. 1954	1.22	4.06–4.60	0.007	Absolute measurements
Washington, D.C.		1300 h
39°N		35°
J. Shaw et al.	0	July 1948	No data	2.9–4.2	0.005–0.01	Difficult to relate the two traces. No absolute values
Cambridge, England				4.2–5.1	0.005–0.01	Difficult to relate the two traces. No absolute values
52°N
J. Shaw et al.	0	22 Apr. 1950	1.12	4.2–4.58	0.0005
Columbus, Ohio.		1140 h
40°N		29°
		1 July 1950	1.10	4.1–4.3	0.0003
		1000 h
		27°
		1 July 1950	1.10	4.03–4.07	0.0005	No zero
		1015 h
		25°
		28 Dec. 1949	Large	3.95–4.01	0.0027
		5 Dec. 1949	Large	3.86–3.96	0.0005
		1650 h
		29 Nov. 1949	Large	3.67–3.86	0.0006
		1300 h
		20 Dec. 1949	Large	3.47–3.67	0.0006
		1515 h
		5 Dec. 1949	Large	4.90–5.28	0.0005	Possible zero given
		1245 h
		5 Dec. 1949	Large	4.58–4.9	0.001	No zero
		1430 h
EMI	0	5 Aug. 1960	1.24	3.5–5.0	0.01
Feltham, England		1100 h
51°N		36°
RAE	0	24 May 1960	1.39	3.5–5.5	0.001	Zero level given. No absolute values
Farnborough, England		0900 h				Zero level given. No absolute values
51°N		44°
M. Migeotte et al.	3.6	23 Mar. 1957	0.95	3.5–4.2	0.0005	Several gain levels, zero given. No absolute values
Jungfraujoch		0830 h				Several gain levels, zero given. No absolute values
46°N		48°
		21 May 1951	0.71	4.4–5.5	0.0005
		1200 h
		27°
NOL	5.2	11 Oct. 1956	0.55	3.5–4.2	0.015	Absolute measurements
Mt. Chacaltaya, Bolivia		1300 h
16°S		11 Oct. 1956	0.57	4.4–5.5	0.03
		1330 h
		24 Oct. 1956	0.54	4.06–4.6	0.003
		1300 h
		11°
RAE	7.5	15 Aug. 1958	0.46	4.37–4.38	0.001	Wavelength estimated from ν₃ C¹³O₂¹⁸. No absolute values
Farnborough		1100 h				Wavelength estimated from ν₃ C¹³O₂¹⁸. No absolute values
51°N		37°
		15 Aug. 1958	0.46	4.40–4.49	0.001
		1100 h
		37°
		29 July 1958	0.47	4.03–4.20	0.001	Zero given
		1400 h
		37°
	10.5	29 July 1958	0.31	4.05–4.20	0.001
		1420 h
		42°
	12	15 Aug. 1958	0.29	4.36–4.70	0.001
		1450 h
		50°
		6 Oct. 1959	0.34	4.4 region	0.001	Short wavelength edge poor
		1200 h
		56°
	13.5	15 Aug. 1958	0.24	4.38–4.70	0.001	No zero level given
		1510 h
		52°
		6 Oct. 1959	0.27	4.00–4.49	0.001	Large background variations
		1230 h
		56°
	14.7	6 Oct. 1959	0.22	4.00–4.20	0.001	Zero given
		1300 h
		57°

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Applied Optics