Abstract

The expedition of the Harvard College Observatory, the Smithsonian Astrophysical Observatory, and the National Geographic Society to Miahuatlán, Mexico, to observe the total solar eclipse of 7 March 1970, is described. Instrumentation included a coronal spectrograph, television cameras recording on videotape, telescopes for photography of coronal polarization, and cameras for direct photography. Photographs and preliminary microphotometer tracings are included.

© 1970 Optical Society of America

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References

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  1. D. H. Menzel, W. W. Salisbury, D. L. Fernald, Appl. Opt. 9, 2648 (1970).
    [CrossRef] [PubMed]
  2. D. H. Menzel, J. M. Pasachoff, Sky and Telescope 36, 380 (1968).
  3. D. H. Menzel, J. M. Pasachoff, National Geographic 138, 222 (August1970).
  4. D. H. Menzel, J. M. Pasachoff, Nature 226, 1143 (June1970).
    [CrossRef] [PubMed]
  5. M. J. Koomen, J. D. Purcell, R. Tousey, Nature 226, 1135 (June1970).
    [CrossRef] [PubMed]

1970 (4)

D. H. Menzel, W. W. Salisbury, D. L. Fernald, Appl. Opt. 9, 2648 (1970).
[CrossRef] [PubMed]

D. H. Menzel, J. M. Pasachoff, National Geographic 138, 222 (August1970).

D. H. Menzel, J. M. Pasachoff, Nature 226, 1143 (June1970).
[CrossRef] [PubMed]

M. J. Koomen, J. D. Purcell, R. Tousey, Nature 226, 1135 (June1970).
[CrossRef] [PubMed]

1968 (1)

D. H. Menzel, J. M. Pasachoff, Sky and Telescope 36, 380 (1968).

Fernald, D. L.

Koomen, M. J.

M. J. Koomen, J. D. Purcell, R. Tousey, Nature 226, 1135 (June1970).
[CrossRef] [PubMed]

Menzel, D. H.

D. H. Menzel, W. W. Salisbury, D. L. Fernald, Appl. Opt. 9, 2648 (1970).
[CrossRef] [PubMed]

D. H. Menzel, J. M. Pasachoff, National Geographic 138, 222 (August1970).

D. H. Menzel, J. M. Pasachoff, Nature 226, 1143 (June1970).
[CrossRef] [PubMed]

D. H. Menzel, J. M. Pasachoff, Sky and Telescope 36, 380 (1968).

Pasachoff, J. M.

D. H. Menzel, J. M. Pasachoff, Nature 226, 1143 (June1970).
[CrossRef] [PubMed]

D. H. Menzel, J. M. Pasachoff, National Geographic 138, 222 (August1970).

D. H. Menzel, J. M. Pasachoff, Sky and Telescope 36, 380 (1968).

Purcell, J. D.

M. J. Koomen, J. D. Purcell, R. Tousey, Nature 226, 1135 (June1970).
[CrossRef] [PubMed]

Salisbury, W. W.

Tousey, R.

M. J. Koomen, J. D. Purcell, R. Tousey, Nature 226, 1135 (June1970).
[CrossRef] [PubMed]

Appl. Opt. (1)

National Geographic (1)

D. H. Menzel, J. M. Pasachoff, National Geographic 138, 222 (August1970).

Nature (2)

D. H. Menzel, J. M. Pasachoff, Nature 226, 1143 (June1970).
[CrossRef] [PubMed]

M. J. Koomen, J. D. Purcell, R. Tousey, Nature 226, 1135 (June1970).
[CrossRef] [PubMed]

Sky and Telescope (1)

D. H. Menzel, J. M. Pasachoff, Sky and Telescope 36, 380 (1968).

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Figures (9)

Fig. 1
Fig. 1

The coronal spectrograph, which covers from 3500 Å to 6000 Å at 18.6 mm Å−1.

Fig. 2
Fig. 2

View of the coronal spectrograph from behind the grating, showing D. H. Menzel in Miahuatlán. The collimator tube is seen end on, and the Schmidt camera extends slightly toward the right. The telescope had been removed, as had the protective house.

Fig. 3
Fig. 3

Photospheric spectrum taken with the eclipse spectrograph.

Fig. 4
Fig. 4

Preliminary microphotometer trace across a spectrum at a constant wavelength at 5303 Å. Emission is visible at both limbs, with the dark center of the moon providing the scattered light calibration.

Fig. 5
Fig. 5

L. A. Lief operates the 5-cm f/20 apochromatic eclipse telescope that photographed the coronal polarization in white light.

Fig. 6
Fig. 6

Series of four photographs in white light with the camera, and the direction of polarization, rotated 45° between each.

Fig. 7
Fig. 7

De Romaña photograph of corona in white unpolarized light.

Fig. 8
Fig. 8

Preliminary microphotometer tracings, not yet calibrated, along solar diameters through a long streamer and an adjacent dark gap.

Fig. 9
Fig. 9

The corona at the total eclipse of 7 March 1970 in white light.

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