A Study of the Solar Spectrum from 7 μ to 400 μ

C. B. Farmer; P. J. Key

doi:10.1364/AO.4.001051

Applied Optics
Vol. 4,
Issue 9,
pp. 1051-1068
(1965)
•https://doi.org/10.1364/AO.4.001051

A Study of the Solar Spectrum from 7 μ to 400 μ

C. B. Farmer and P. J. Key

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C. B. Farmer and P. J. Key, "A Study of the Solar Spectrum from 7 μ to 400 μ," Appl. Opt. 4, 1051-1068 (1965)

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Abstract

A series of measurements of the solar spectrum covering the wavelength range 7–400 μ, made from an observing site in the Bolivian Andes at 5200-m altitude, is described. The experimental technique was designed to give both high resolution (0.3 cm⁻¹) spectra for line identification purposes and absolute transmittance data for measured values of the atmospheric water content in the solar paths.

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Wavelength range (μ)	Grating (lines/ mm)	Transmission filters	Reflection filters
7–14	98.4	InSb
14–23	36.9	InSb	2 × MgO reststrahlen
22–40	24.6	black polythene	2 × NaF reststrahlen
			2 × 320 scatter plates
33–52	12.3	black polythene	2 × BaF reststrahlen
			2 × 220 scatter plates
52–65	12.3	black polythene	2 × NaCl reststrahlen
			2 × 220 scatter plates
65–90	12.3	black polythene	2 × KBr reststrahlen
			2 × 220 scatter plates
100–190	4.37	black polythene crystal quartz	2 × KRS-5 reststrahlen
			2 × 180 scatter plates
190–400	2.185	black polythene crystal quartz 2 × powder filters	2 × 120 scatter plates

Figure	Date (1964)	Air mass (base pressure 535 mb)	Zenith water content (pr. mm)
4(a)
(b)	July 21	0.69	1.8
(c)
(d) (i)
4(d) (ii)	Sept. 8	0.61	1.8
4(d) (iii)		2.54–1.32
(e) (i)		1.22–0.80
(e) (ii)	Sept. 9	0.80–0.64	3.2
(f) (i)		0.66–0.61
(f) (ii)		0.61–0.58
(f) (iii)		0.58
4(g) (i)		0.66	1.6
(g) (ii)	Aug. 13	0.61–0.69	1.8
(g) (iii)		0.69–0.87	1.9
4(h) (i)		0.72–0.61
(h) (ii)	Sept. 3	0.61–0.58	2.0
(h) (iii)		0.58
4(j) (i)	Sept. 4	0.61	1.7
5(a) (i)		0.80–0.77
(a) (ii)		0.77–0.74
(a) (iii)	Sept. 1	0.74–0.72	2.0
(b) (i)		0.72–0.69
(b) (ii)		0.69–0.66
(b) (iii)		0.66
5(c)	July 9	0.72	1.6
5(d)	Sept. 4	0.61	1.7
6	June 26	0.64	1.9

Wavelength range (μ)	Grating (lines/ mm)	Transmission filters	Reflection filters
7–14	98.4	InSb
14–23	36.9	InSb	2 × MgO reststrahlen
22–40	24.6	black polythene	2 × NaF reststrahlen
			2 × 320 scatter plates
33–52	12.3	black polythene	2 × BaF reststrahlen
			2 × 220 scatter plates
52–65	12.3	black polythene	2 × NaCl reststrahlen
			2 × 220 scatter plates
65–90	12.3	black polythene	2 × KBr reststrahlen
			2 × 220 scatter plates
100–190	4.37	black polythene crystal quartz	2 × KRS-5 reststrahlen
			2 × 180 scatter plates
190–400	2.185	black polythene crystal quartz 2 × powder filters	2 × 120 scatter plates

Figure	Date (1964)	Air mass (base pressure 535 mb)	Zenith water content (pr. mm)
4(a)
(b)	July 21	0.69	1.8
(c)
(d) (i)
4(d) (ii)	Sept. 8	0.61	1.8
4(d) (iii)		2.54–1.32
(e) (i)		1.22–0.80
(e) (ii)	Sept. 9	0.80–0.64	3.2
(f) (i)		0.66–0.61
(f) (ii)		0.61–0.58
(f) (iii)		0.58
4(g) (i)		0.66	1.6
(g) (ii)	Aug. 13	0.61–0.69	1.8
(g) (iii)		0.69–0.87	1.9
4(h) (i)		0.72–0.61
(h) (ii)	Sept. 3	0.61–0.58	2.0
(h) (iii)		0.58
4(j) (i)	Sept. 4	0.61	1.7
5(a) (i)		0.80–0.77
(a) (ii)		0.77–0.74
(a) (iii)	Sept. 1	0.74–0.72	2.0
(b) (i)		0.72–0.69
(b) (ii)		0.69–0.66
(b) (iii)		0.66
5(c)	July 9	0.72	1.6
5(d)	Sept. 4	0.61	1.7
6	June 26	0.64	1.9

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Applied Optics