Infrared Radiometric Observations of the Solar Corona During the Total Solar Eclipse of 20 July 1963

J. H. Taylor; R. M. MacQueen

doi:10.1364/AO.3.001365

Applied Optics
Vol. 3,
Issue 12,
pp. 1365-1371
(1964)
•https://doi.org/10.1364/AO.3.001365

Infrared Radiometric Observations of the Solar Corona During the Total Solar Eclipse of 20 July 1963

J. H. Taylor and R. M. MacQueen

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J. H. Taylor and R. M. MacQueen, "Infrared Radiometric Observations of the Solar Corona During the Total Solar Eclipse of 20 July 1963," Appl. Opt. 3, 1365-1371 (1964)

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Abstract

Radiometric measurements of the solar corona have been made in the spectral region 1.15–5.1 μ during the total solar eclipse of 20 July 1963. A 78.7-cm diam, f/2 radiometer equipped with a thermistor bolometer detector was employed. Four wide band interference filters were used for spectral isolation, namely, 1.15–2.60 μ, 2.9–4.2 μ, 4.5–5.1 μ, and 7.6–13.4 μ. Coronal spectral intensities were measured as a function of radial position. The radial dependence of these intensities was calculated and compared with the van de Hulst model of the visible corona. Radiometric measurements were made during and after totality.

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Filter no.	Spectral region (μ)	Average transmission (%)	Manufacturer and type
A	1.15–2.60	48.6	Texas Instruments Silicon (silicon monoxide over-coating) and Polaroid Corporation XRX70
B	2.9–4.2	37.3	Bausch & Lomb 457 and Optical Coating Laboratories WO4915-4
C	4.5–5.1	83.4	Optical Coating Laboratories W04915-4
D	7.6–13.4	77.3	Perkin-Elmer Germanium 237-1012

Longitude W	145° 28′ 00.″0
Latitude N	62° 09′ 00.″0
Height above sea level	1573 ft (480 m)
Second contact	20 h 06 min 29.3 sec U.T.
Third contact	20 h 07 min 07.1 sec U.T.
Position angle of second contact	179°
Position angle of third contact	224°
Height of sun at mid-totality	45°

Run	Radial position	Filter	Coronal deflection (mm)	Photospheric deflection (mm)	Mask attenuation factor	E_k/E_⊙	C_Δλ watt cm⁻² sr⁻¹
A	1.07 R_⊙	1 (see Fig. 3A)	6.0	11.3	2.84 × 10⁻⁶	1.86 × 10⁻⁶^a	8.46 × 10⁻⁴^a
		2 (see Fig. 3B)	5.5	12.5	2.84 × 10⁻⁶	1.55 × 10⁻⁶^a	9.68 × 10⁻⁴^a
		3 (see Fig. 3C)	4.5	19.5	2.27 × 10⁻⁵	6.48 × 10⁻⁶^a	7.66 × 10⁻⁴^a,^b
		4 (see Fig. 3D)	—	70	2.27 × 10⁻⁵	—	—
B	1.21 R_⊙	1 (see Fig. 3A)	4.3	11.3	2.84 × 10⁻⁶	1.08 × 10⁻⁶	4.93 × 10⁻⁴
		2 (see Fig. 3B)	5.1	12.5	2.84 × 10⁻⁶	1.16 × 10⁻⁶	7.24 × 10⁻⁴
		3 (see Fig. 3C)	4.2	19.5	2.27 × 10⁻⁵	4.88 × 10⁻⁶	5.82 × 10⁻⁴^b
		4 (see Fig. 3D)	—	70	2.27 × 10⁻⁵	—	—

Run	Radial position	Filter	Coronal deflection (mm)	Photospheric deflection (mm)	Mask attenuation factor	E_k/E_⊙	C_Δλ watt cm⁻² sr⁻¹
C	1.13 R_⊙	1	7.2	11.3	2.84 × 10⁻⁶	1.89 × 10⁻⁶^a	8.54 × 10⁻⁴^a
		2	7.3	12.5	2.84 × 10⁻⁶	1.73 × 10⁻⁶^a	10.92 × 10⁻⁴^a
		3	5.6	19.5	2.27 × 10⁻⁵	6.80 × 10⁻⁶^a	7.87 × 10⁻⁴^a
		4	—		2.27 × 10⁻⁵	—	—
D	1.55 R_⊙	1	6.0	11.3	2.84 × 10⁻⁶	1.51 × 10⁻¹	6.84 × 10⁻⁴
		2	5.5	12.5	2.84 × 10⁻¹	1.26 × 10⁻⁶	7.93 × 10⁻⁴
		3	5.2	19.5	2.27 × 10⁻⁵	6.05 × 10⁻⁶	7.06 × 10⁻⁴
		4	—		2.27 × 10⁻⁵	—	—
E	1.95 R_⊙	1	7.6	11.3	2.84 × 10⁻⁵	1.91 × 10⁻⁶	8.69 × 10⁻⁴
		2	4.6	12.5	2.84 × 10⁻⁶	1.05 × 10⁻⁶	6.62 × 10⁻⁴
		3	4.6	19.5	2.27 × 10⁻⁵	5.35 × 10⁻⁶	6.32 × 10⁻⁴
		4	—		2.27 × 10⁻⁵	—	—

Filter no.	Spectral region (μ)	Average transmission (%)	Manufacturer and type
A	1.15–2.60	48.6	Texas Instruments Silicon (silicon monoxide over-coating) and Polaroid Corporation XRX70
B	2.9–4.2	37.3	Bausch & Lomb 457 and Optical Coating Laboratories WO4915-4
C	4.5–5.1	83.4	Optical Coating Laboratories W04915-4
D	7.6–13.4	77.3	Perkin-Elmer Germanium 237-1012

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Applied Optics