Rocket Spectroheliograph for the Mg ii Line at 2802.7 Å

Kerstin Fredga

doi:10.1364/AO.8.000333

Applied Optics
Vol. 8,
Issue 2,
pp. 333-343
(1969)
•https://doi.org/10.1364/AO.8.000333

Rocket Spectroheliograph for the Mg ii Line at 2802.7 Å

Kerstin Fredga

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Kerstin Fredga, "Rocket Spectroheliograph for the Mg ii Line at 2802.7 Å," Appl. Opt. 8, 333-343 (1969)

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Abstract

A rocket-borne spectroheliograph designed to take monochromatic pictures of the sun in the Mg ii line at 2802. 7 Å is described in detail. The photographic system consists of a Questar telescope, a Šolc type birefringent filter, and an automatic Robot camera. The double Šolc filter has a spectral bandwidth of 3.5. Å. The two units in the double filter have been thoroughly tested and are compared with theoretically calculated transmission curves. Two new types of linear film polarizers for the uv region have been tested and used in the filter. A temperature control unit was developed which stabilized the filter temperature in flight to within ±0.2°C. The instrument has been tested in vacuum and to the Aerobee 150 vibration specifications. It has been flown and successfully recovered three times and performed excellently during each flight.

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Element	Orientation
Polarizer	P₁ = 0°
Plate 1	ω₁ = +ρ
Plate 2	ω₂ = −(ρ + δ)
Plate 3	ω₃ = +(ρ + 2δ)
Plate 4	ω₄ = −(ρ + 3δ)
⋮	⋮
Plate N − 1	ω_N₋₁ = ±(ρ + δ)
Plate N	ω_N₋₁ = ±ρ
Polarizer	P₂ = 90°

k	F₁ Calculated		Measured λ_max.	k	F₂ Calculated		Measured λ_max
k	λ_max	Δλ	Measured λ_max.	k	λ_max.	Δλ	Measured λ_max
20	2197.0	2.0	2202	22	2251.8	1.9	2259
19	2268.8	2.3	2271	21	2319.6	2.1	2325
18	2349.4	2.6	2354	20	2394.9	2.4	2395
17	2440.5	3.0	2442	19	2479.0	2.7	2480
16	2544.4	3.4	2546	18	2573.6	3.1	2575
15	2663.9	3.9	2663	17	2680.6	3.5	2680
14	2802.7	4.6	2803	16	2802.7	4.0	2803
13	2965.8	5.4	2966	15	2943.2	4.6	2938
12	3159.7	6.5	3159	14	3106.2	5.4	3103
11	3393.8	7.9	3393	13	3297.6	6.4	3293
10	3681.1	9.8	3683	12	3525.2	7.7	3524
9	4041.0	12.4	4039	11	3799.2	9.3	3799
8	4502.8	16.3	4499	10	4135.0	11.4	4134
7	5113.5	21.6	5110	9	4554.4	14.4	4550
6	5953.8	30.6	5946	8	5090.8	18.8	5085

Bandwidth Δλ in Å	F₁	F₂
(full width at half intensity)
Experimental	5.9	4.5
Calculated type A	4.6	4.1
Calculated type C	5.2	4.5

Type of polarizer	t_y(%)	P(%)
Single Polacoat 105UV	43	90
Single Polaroid HNP’B	38	93
105UV + HNP’B parallel	16	99.2

	12 April 1965	2 December 1965
Polarizers	Linear film polarizers: one Polacoat 105UV and one Polaroid HNP’B oriented parallel in each polarizer	P₁: Calcite Rochon prism P₂ and P₃: linear film polarizers: double Polacoat 105UV in each polarizer
Peak wavelength	2802.7 Å	2802.7 Å
Bandpass (full width at half intensity)	4.0 Å	3.5 Å
Peak transmission	0.13%	1.1%
$Contrast = \frac{T max}{T first min}$	165	275
Operating temperature	11.0°C	13.7°C
Shift of wavelength with temperature	−0.17 Å/°C	−0.17 Å/C

Rocket and instrument data
Rocket Aerobee 150	NASA 4:49GS	NASA 4:53GS	NASA 4:145GS
Launch date	12 April 1965	26 October 1965	2 December 1965
Launch time local	07^h47^m46^s	08^h25^m02^s	10^h30^m03^s
Launch time U. T.	14 47 46	15 25 02	17 30 03
Peak altitude	203 km	197 km	185 km
Recovery	Yes	Yes	Yes
Pointing control Ball Brothers	SPC 318 D	SPC 320 D	SPC 320 D-2
Pointing time	260 sec	0 sec	23 sec
Programmed exposure times	$\frac{1}{15} 10 sec$	$\frac{1}{60} 1 sec$	$\frac{1}{60} 1 sec$
Obtained pictures	90	0	20
Best picture
Time U.T.	14^h53^m33^s	—	17^h31^m53^s
Exposure time	$\frac{1}{8} sec$	—	$\frac{1}{9} sec$
Maximum smearing due to pointing error
Elevation	0.3′	—	0.4′
Azimuth	1.0′	—	1.0′

Radiometer	Effective wavelength Å	Effective bandwidth Å
2200	2202	111
2600	2608	99
2800B	2817	142
2800N	2807	45

Radiometer	Effective wavelength Å	Effective bandwidth Å
2200	2202	111
2600	2608	99
2800B	2817	142
2800N	2807	45

Abstract

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Equations (12)

Applied Optics