Abstract

Further studies of the spectral data obtained in the February 1960 rocket experiment [ Ann. Geophys. 17, 109 ( 1961)] have confirmed much of the preliminary analysis. New bands of the Lyman–Birge–Hopfield system in the 1700–2200 Å region have been identified. More precise wavelength determinations have been made, and previously indicated bands of N2 have been more positively identified. The Lyman α line of hydrogen is just detectable. The intensity distribution among the various bands during weak auroral conditions is shown to differ markedly from more intense displays. Laboratory data obtained from a microwave discharge in very pure N2 show good correlation with some features of the rocket spectra.

© 1962 Optical Society of America

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References

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  1. W. G. Fastie, H. M. Crosswhite, and T. P. Markham, Ann. Geophys. 17, 109 (1961).
  2. We are indebted to Dr. Raymond Montalbetti, Director Defense Research Northern Laboratory, for obtaining these photographs and also for obtaining ground-based auroral spectra for comparison purposes.
  3. The “rayleigh” is a unit of photon flux proposed by. D. M. Hunten, F. E. Roach, and J. W. Chamberlain [J. Atmospheric Terrest. Phys. 8, 345 (1956)] denned as 106quanta/cm2-sec for 4π sr.
    [Crossref]

1961 (1)

W. G. Fastie, H. M. Crosswhite, and T. P. Markham, Ann. Geophys. 17, 109 (1961).

1956 (1)

The “rayleigh” is a unit of photon flux proposed by. D. M. Hunten, F. E. Roach, and J. W. Chamberlain [J. Atmospheric Terrest. Phys. 8, 345 (1956)] denned as 106quanta/cm2-sec for 4π sr.
[Crossref]

Chamberlain, J. W.

The “rayleigh” is a unit of photon flux proposed by. D. M. Hunten, F. E. Roach, and J. W. Chamberlain [J. Atmospheric Terrest. Phys. 8, 345 (1956)] denned as 106quanta/cm2-sec for 4π sr.
[Crossref]

Crosswhite, H. M.

W. G. Fastie, H. M. Crosswhite, and T. P. Markham, Ann. Geophys. 17, 109 (1961).

Fastie, W. G.

W. G. Fastie, H. M. Crosswhite, and T. P. Markham, Ann. Geophys. 17, 109 (1961).

Hunten, D. M.

The “rayleigh” is a unit of photon flux proposed by. D. M. Hunten, F. E. Roach, and J. W. Chamberlain [J. Atmospheric Terrest. Phys. 8, 345 (1956)] denned as 106quanta/cm2-sec for 4π sr.
[Crossref]

Markham, T. P.

W. G. Fastie, H. M. Crosswhite, and T. P. Markham, Ann. Geophys. 17, 109 (1961).

Roach, F. E.

The “rayleigh” is a unit of photon flux proposed by. D. M. Hunten, F. E. Roach, and J. W. Chamberlain [J. Atmospheric Terrest. Phys. 8, 345 (1956)] denned as 106quanta/cm2-sec for 4π sr.
[Crossref]

Ann. Geophys. (1)

W. G. Fastie, H. M. Crosswhite, and T. P. Markham, Ann. Geophys. 17, 109 (1961).

J. Atmospheric Terrest. Phys. (1)

The “rayleigh” is a unit of photon flux proposed by. D. M. Hunten, F. E. Roach, and J. W. Chamberlain [J. Atmospheric Terrest. Phys. 8, 345 (1956)] denned as 106quanta/cm2-sec for 4π sr.
[Crossref]

Other (1)

We are indebted to Dr. Raymond Montalbetti, Director Defense Research Northern Laboratory, for obtaining these photographs and also for obtaining ground-based auroral spectra for comparison purposes.

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Figures (7)

Fig. 1
Fig. 1

Schematic path of rocket.

Fig. 2
Fig. 2

All-sky photographs of aurora. Black circles indicate approximate position of rocket.

Fig. 3
Fig. 3

Composite of four brightest auroral spectra.

Fig. 4
Fig. 4

Comparison of aurora and laboratory spectra near 2000 Å. A—Copy of portion of Fig. 3; B—N2 spectrum with identical optical system; C—Same, at higher resolution.

Fig. 5
Fig. 5

Comparison of aurora and laboratory spectra near 2900 Å. A—Copy of portion of Fig. 3; B—N2 spectrum with identical optical system; C—Same, at higher resolution.

Fig. 6
Fig. 6

Comparison of bright aurora (A) with composite of eleven weaker spectra (B).

Fig. 7
Fig. 7

A—Copy of short wavelength portion of Fig. 3; B—Copy of long wavelength portion or Fig. 3 with compressed scale.

Tables (2)

Tables Icon

Table I Relative intensities in N2 second-positive system. Intensities are in arbitrary units.

Tables Icon

Table II Intensities in auroral and subauroral spectra.