Abstract

A small grazing incidence monochromator was flown on the NASA OSO-4 satellite to monitor variations in the absolute flux of the solar He ii Lyman-α line at 303.8 Å. The design of the instrument is described in some detail, and the procedures for photometric calibration are discussed. Examples are shown of the results obtained during the two-year period of operation in orbit.

© 1971 Optical Society of America

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References

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  1. J. A. R. Samson, J. Opt. Soc. Amer. 54, 6 (1964).
    [CrossRef]
  2. K. Watanabe, F. M. Matsunaga, H. Sakai, Appl. Opt. 6, 391 (1967).
    [CrossRef] [PubMed]
  3. ESSA, Solar-Geophysical Data, No. 285 (1968).
  4. S. R. Pottasch, Space Sci. Rev. 3, 816 (1964).
    [CrossRef]

1968 (1)

ESSA, Solar-Geophysical Data, No. 285 (1968).

1967 (1)

1964 (2)

J. A. R. Samson, J. Opt. Soc. Amer. 54, 6 (1964).
[CrossRef]

S. R. Pottasch, Space Sci. Rev. 3, 816 (1964).
[CrossRef]

Appl. Opt. (1)

J. Opt. Soc. Amer. (1)

J. A. R. Samson, J. Opt. Soc. Amer. 54, 6 (1964).
[CrossRef]

Solar-Geophysical Data, No. 285 (1)

ESSA, Solar-Geophysical Data, No. 285 (1968).

Space Sci. Rev. (1)

S. R. Pottasch, Space Sci. Rev. 3, 816 (1964).
[CrossRef]

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Figures (7)

Fig. 1
Fig. 1

Optical diagram of the monochromator.

Fig. 2
Fig. 2

Assembly of the monochromator in the flight package.

Fig. 3
Fig. 3

Complete flight package mounted in the OSO wheel compartment.

Fig. 4
Fig. 4

Block diagram of experiment electronics.

Fig. 5
Fig. 5

Increase in Helium ii Lyman-α flux during an importance 2 optical flare on 2nd November 1967.

Fig. 6
Fig. 6

Long term intensity variations in the Helium ii Lyman-α flux. ▲, mean value from the SL502 sounding rocket spectrometers.

Fig. 7
Fig. 7

Atmospheric absorption profile for the Helium ii Lyman-α line.

Equations (3)

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N ( λ ) = A λ 1 λ 2 λ Φ λ d λ ,
λ = E λ γ λ ,
γ λ = Y λ P ,

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