Abstract

An auroral-airglow photometer is described which automatically samples the night sky continuum at a wavelength adjacent to the emission line and subtracts the contribution of the continuum to the total observed signal. The sampling rate of 150 cps permits the subtraction of fluctuations in the continuum. Emission intensities over seven orders of magnitude may be monitored in unattended operation with an over-all response time of 1 sec/decade. Three emission wavelengths are monitored sequentially. The logarithm of the intensity is automatically recorded on a strip chart recorder. Full-scale deflection of the recorder pen corresponds to one decade of light intensity.

© 1965 Optical Society of America

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References

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  1. J. W. Chamberlain, Physics of the Aurora and Airglow (Academic, New York, 1961), p. 360.
  2. R. B. Dunn, E. R. Manning, J. Opt. Soc. Am. 46, 572 (1956).
    [CrossRef]
  3. D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
    [CrossRef]
  4. C. M. Purdy, L. R. Megill, F. E. Roach, J. Res. Natl. Bur. Std. 65c, 213 (1961).
  5. J. A. Greenspan, C. A. Stone, J. Geophys. Res. 69, 465 (1964).
    [CrossRef]
  6. S. H. Neff, J. Geophys. Res. 68, 587 (1963).
    [CrossRef]

1964 (2)

D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
[CrossRef]

J. A. Greenspan, C. A. Stone, J. Geophys. Res. 69, 465 (1964).
[CrossRef]

1963 (1)

S. H. Neff, J. Geophys. Res. 68, 587 (1963).
[CrossRef]

1961 (1)

C. M. Purdy, L. R. Megill, F. E. Roach, J. Res. Natl. Bur. Std. 65c, 213 (1961).

1956 (1)

Chamberlain, J. W.

J. W. Chamberlain, Physics of the Aurora and Airglow (Academic, New York, 1961), p. 360.

Dunn, R. B.

Ellyett, C. D.

D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
[CrossRef]

Greenspan, J. A.

J. A. Greenspan, C. A. Stone, J. Geophys. Res. 69, 465 (1964).
[CrossRef]

Hunten, D. M.

D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
[CrossRef]

Manning, E. R.

McLauchlan, E. C.

D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
[CrossRef]

Megill, L. R.

C. M. Purdy, L. R. Megill, F. E. Roach, J. Res. Natl. Bur. Std. 65c, 213 (1961).

Neff, S. H.

S. H. Neff, J. Geophys. Res. 68, 587 (1963).
[CrossRef]

Purdy, C. M.

C. M. Purdy, L. R. Megill, F. E. Roach, J. Res. Natl. Bur. Std. 65c, 213 (1961).

Roach, F. E.

C. M. Purdy, L. R. Megill, F. E. Roach, J. Res. Natl. Bur. Std. 65c, 213 (1961).

Stone, C. A.

J. A. Greenspan, C. A. Stone, J. Geophys. Res. 69, 465 (1964).
[CrossRef]

Vallance Jones, A.

D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
[CrossRef]

J. Atmospheric Terrest. Phys. (1)

D. M. Hunten, A. Vallance Jones, C. D. Ellyett, E. C. McLauchlan, J. Atmospheric Terrest. Phys. 26, 67 (1964).
[CrossRef]

J. Geophys. Res. (2)

J. A. Greenspan, C. A. Stone, J. Geophys. Res. 69, 465 (1964).
[CrossRef]

S. H. Neff, J. Geophys. Res. 68, 587 (1963).
[CrossRef]

J. Opt. Soc. Am. (1)

J. Res. Natl. Bur. Std. (1)

C. M. Purdy, L. R. Megill, F. E. Roach, J. Res. Natl. Bur. Std. 65c, 213 (1961).

Other (1)

J. W. Chamberlain, Physics of the Aurora and Airglow (Academic, New York, 1961), p. 360.

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Figures (7)

Fig. 1
Fig. 1

Schematic of photometer optics for continuum subtraction (see text for description).

Fig. 2
Fig. 2

Construction of photometer telescope showing the essential optical components.

Fig. 3
Fig. 3

Comparison of birefringent readings and continuum subtracted readings for (a) 5577 Å and (b) 6300 Å airglow.

Fig. 4
Fig. 4

Photometer spectral response and subtraction efficiency for the (a) 5577 Å and (b) 6300 Å filters.

Fig. 5
Fig. 5

Block diagram of photometer electronics (see text for description).

Fig. 6
Fig. 6

Assembled photometer and electronics.

Fig. 7
Fig. 7

Typical airglow record obtained with the IITRI photometer.

Equations (6)

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V 1 = S L λ T λ Δ λ P λ ,
V 2 = E c T λ Δ λ P λ + E λ T λ P λ ,
V 3 = E c T c Δ c P c .
V D = V 2 - V 3 = E c [ T λ Δ λ P λ - T c Δ c P c ] + E λ T λ P λ .
T λ Δ λ P λ = T c Δ c P c ,
E λ ( rayleighs ) = V D ( 1 T P ) = V D ( S L λ Δ λ V 1 ) = V D Q .

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