Abstract

This paper describes the derivation of the preflight photometric calibration of the uv spectrometer on Sky-lab. The calibration of the orbiting instrument through cross-comparison with two rocket instruments is discussed in assessing the observed changes in response to quiet solar regions during the mission. Formulas are presented for the determination of the instrument sensitivity, and an uncertainty of ±35% is assigned over most of the 296–1340-Å wavelength range.

© 1977 Optical Society of America

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References

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  1. E. M. Reeves, W. H. Parkinson, Appl. Opt. 9, 1201 (1970).
    [CrossRef] [PubMed]
  2. M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
    [CrossRef]
  3. J. G. Timothy, Bull. Am. Astron. Soc. 7, 407 (1975).
  4. J. G. Timothy, Astrophys. J., to be submitted (1977).
  5. M. C. E. Huber, E. M. Reeves, J. G. Timothy, “Space Optics,” Proc. IXth International Congress, International Commission for Optics, Santa Monica, 9–13 Oct. 1972, B. J. Thompson, R. R. Shannon, Eds. (U.S. National Academy of Sciences, Washington D.C., 1974), p. 33.
  6. J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).
  7. J. G. Timothy, E. M. Reeves, Prog. Astronaut. Aeronaut. 48, 123 (1976).
  8. J. G. Timothy, L. B. Lapson, Appl. Opt. 13, 1417 (1974).
    [CrossRef] [PubMed]
  9. E. M. Reeves, Sol. Phys. 46, 53 (1976).
    [CrossRef]

1976

J. G. Timothy, E. M. Reeves, Prog. Astronaut. Aeronaut. 48, 123 (1976).

E. M. Reeves, Sol. Phys. 46, 53 (1976).
[CrossRef]

1975

J. G. Timothy, Bull. Am. Astron. Soc. 7, 407 (1975).

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

1974

1973

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

1970

Chambers, R. M.

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

d’Entremont, A. M.

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

Dupree, A. K.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

Goldberg, L.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

Huber, M. C. E.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

M. C. E. Huber, E. M. Reeves, J. G. Timothy, “Space Optics,” Proc. IXth International Congress, International Commission for Optics, Santa Monica, 9–13 Oct. 1972, B. J. Thompson, R. R. Shannon, Eds. (U.S. National Academy of Sciences, Washington D.C., 1974), p. 33.

Lanham, N. W.

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

Lapson, L. B.

Noyes, R. W.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

Parkinson, W. H.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

E. M. Reeves, W. H. Parkinson, Appl. Opt. 9, 1201 (1970).
[CrossRef] [PubMed]

Reeves, E. M.

J. G. Timothy, E. M. Reeves, Prog. Astronaut. Aeronaut. 48, 123 (1976).

E. M. Reeves, Sol. Phys. 46, 53 (1976).
[CrossRef]

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

E. M. Reeves, W. H. Parkinson, Appl. Opt. 9, 1201 (1970).
[CrossRef] [PubMed]

M. C. E. Huber, E. M. Reeves, J. G. Timothy, “Space Optics,” Proc. IXth International Congress, International Commission for Optics, Santa Monica, 9–13 Oct. 1972, B. J. Thompson, R. R. Shannon, Eds. (U.S. National Academy of Sciences, Washington D.C., 1974), p. 33.

Timothy, J. G.

J. G. Timothy, E. M. Reeves, Prog. Astronaut. Aeronaut. 48, 123 (1976).

J. G. Timothy, Bull. Am. Astron. Soc. 7, 407 (1975).

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

J. G. Timothy, L. B. Lapson, Appl. Opt. 13, 1417 (1974).
[CrossRef] [PubMed]

J. G. Timothy, Astrophys. J., to be submitted (1977).

M. C. E. Huber, E. M. Reeves, J. G. Timothy, “Space Optics,” Proc. IXth International Congress, International Commission for Optics, Santa Monica, 9–13 Oct. 1972, B. J. Thompson, R. R. Shannon, Eds. (U.S. National Academy of Sciences, Washington D.C., 1974), p. 33.

Withbroe, G. L.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

Appl. Opt.

Astrophys. J.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, Astrophys. J. 183, 291 (1973).
[CrossRef]

Bull. Am. Astron. Soc.

J. G. Timothy, Bull. Am. Astron. Soc. 7, 407 (1975).

Prog. Astronaut. Aeronaut.

J. G. Timothy, E. M. Reeves, Prog. Astronaut. Aeronaut. 48, 123 (1976).

Sol. Phys.

E. M. Reeves, Sol. Phys. 46, 53 (1976).
[CrossRef]

Space Sci. Instrum.

J. G. Timothy, R. M. Chambers, A. M. d’Entremont, N. W. Lanham, E. M. Reeves, Space Sci. Instrum. 1, 23 (1975).

Other

J. G. Timothy, Astrophys. J., to be submitted (1977).

M. C. E. Huber, E. M. Reeves, J. G. Timothy, “Space Optics,” Proc. IXth International Congress, International Commission for Optics, Santa Monica, 9–13 Oct. 1972, B. J. Thompson, R. R. Shannon, Eds. (U.S. National Academy of Sciences, Washington D.C., 1974), p. 33.

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Figures (7)

Fig. 1
Fig. 1

(a) The relative positions of the calibration rocket instrument is shown for the flight of 10 December 1973 against the background of the ATM instrument spectroheliogram in C iii 977 Å. (b) The relative response of the two instruments across the fields of view indicated above.

Fig. 2
Fig. 2

Optical schematic of the calibration rocket spectroheliometer.

Fig. 3
Fig. 3

Laboratory arrangement for spectrometer calibration.

Fig. 4
Fig. 4

Variation of the average count and the most probable count in quiet sun spectroheliograms from the ATM instrument during the Skylab mission.

Fig. 5
Fig. 5

Comparison of the apparent relative calibration changes observed in orbit and the results of the preflight and rocket measurements.

Fig. 6
Fig. 6

Prelaunch instrument efficiency kλ1, for detector 1.

Fig. 7
Fig. 7

Graph of the wavelength dependent calibration constants Bλ′ and Bλ.

Tables (3)

Tables Icon

Table I Operating Characteristics of Calibration Rocket Payload

Tables Icon

Table II Instrument Efficiencies for Detectors 2 to 7, Relative to Detector 1

Tables Icon

Table III Over-all Instrument Efficiency for Detector 1, kλ1, given in (counts erg−1 cm2 sr sec Δt−1) as Measured During Final Laboratory Calibration a

Equations (8)

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N ( λ ) = A · a f 2 λ 1 λ 2 R λ E λ Φ λ d λ = λ 1 λ 2 K λ Φ λ d λ ,
I λ D = S λ ( t ) F ( t ) k λ D n D ( λ ) ,
k λ D = k λ 1 · r λ D ,
S λ ( t ) = 10 B λ ( DOY - 150 / 250 )             for 150 DOY 400 , for λ 977 Å ,
S λ ( t ) = 10 B λ ( DOY - 150 / 100 )             for 150 DOY 250 , for λ > 977 Å ,
S λ ( t ) = 10 B λ + B λ ( DOY - 250 / 150 )             for DOY > 250 , for λ > 977 Å ,
F ( t ) = 0.87 · 10 0.45 ( DOY - 150 / 250 ) .
I λ D = S λ ( t ) · F ( t ) k λ 1 · r λ D · n D ( λ )

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