Abstract

The experimental design described here allows us to study with 2-Å bandpass filters the brightness distribution of the green coronal line, the two infrared lines of Fe xiii, and the neighboring coronal continuum. For the first time, in an eclipse expedition, electrostatic cameras derived from the Lallemand type are used; full advantage was taken of their speed, especially in the near infrared spectral range, and their good photometric qualities. They permit the measurement of intensity and polarization of the lines in the corona to a height of 1.25 solar radii above the limb of the sun, with a spatial resolution ≥ (10″)2.

© 1970 Optical Society of America

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References

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  1. D. E. Billings, A Guide to the Solar Corona (Academic, New York, 1966), p. 191.
  2. E. Tandberg-Hanssen, Solar Activity (Blaisdell PublishingCompany, Waltham, Mass., 1967), p. 132.
  3. J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).
  4. A. Lallemand, Advan. Electron. Electron Phys. 16, 1 (1962).
    [CrossRef]
  5. A. Lallemand, Advan. Electron. Electron Phys. 22A, 1 (1966).
    [CrossRef]
  6. A. Duchesne, Advan. Electron. Electron Phys. 16, 19 (1962).
    [CrossRef]
  7. P. Charvin, Ann. d’Astrophys. 28, 877 (1965).

1969 (1)

J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).

1966 (1)

A. Lallemand, Advan. Electron. Electron Phys. 22A, 1 (1966).
[CrossRef]

1965 (1)

P. Charvin, Ann. d’Astrophys. 28, 877 (1965).

1962 (2)

A. Duchesne, Advan. Electron. Electron Phys. 16, 19 (1962).
[CrossRef]

A. Lallemand, Advan. Electron. Electron Phys. 16, 1 (1962).
[CrossRef]

Billings, D. E.

D. E. Billings, A Guide to the Solar Corona (Academic, New York, 1966), p. 191.

Charvin, P.

P. Charvin, Ann. d’Astrophys. 28, 877 (1965).

Combes, J.

J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).

Duchesne, A.

A. Duchesne, Advan. Electron. Electron Phys. 16, 19 (1962).
[CrossRef]

Felenbok, P.

J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).

Guerin, J.

J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).

Lallemand, A.

A. Lallemand, Advan. Electron. Electron Phys. 22A, 1 (1966).
[CrossRef]

A. Lallemand, Advan. Electron. Electron Phys. 16, 1 (1962).
[CrossRef]

Picat, J. P.

J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).

Tandberg-Hanssen, E.

E. Tandberg-Hanssen, Solar Activity (Blaisdell PublishingCompany, Waltham, Mass., 1967), p. 132.

Advan. Electron. Electron Phys. (4)

J. Combes, P. Felenbok, J. Guerin, J. P. Picat, Advan. Electron. Electron Phys. 28A, 47 (1969).

A. Lallemand, Advan. Electron. Electron Phys. 16, 1 (1962).
[CrossRef]

A. Lallemand, Advan. Electron. Electron Phys. 22A, 1 (1966).
[CrossRef]

A. Duchesne, Advan. Electron. Electron Phys. 16, 19 (1962).
[CrossRef]

Ann. d’Astrophys. (1)

P. Charvin, Ann. d’Astrophys. 28, 877 (1965).

Other (2)

D. E. Billings, A Guide to the Solar Corona (Academic, New York, 1966), p. 191.

E. Tandberg-Hanssen, Solar Activity (Blaisdell PublishingCompany, Waltham, Mass., 1967), p. 132.

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Figures (4)

Fig. 1
Fig. 1

Equatorial mount with its two electronic cameras during the eclipse expedition of 7 March 1970.

Fig. 2
Fig. 2

Optical diagram.

Fig. 3
Fig. 3

Photocathode introduction system attached to the electronic camera.

Fig. 4
Fig. 4

(a) Absolute calibration of the sun; (b) field observation in the white light corona; (c) total intensity in λ = 5303 Å bandpass of the filter: 2.0 Å, exposure time = 1.5 sec.

Tables (1)

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Table I Widths of Iron Lines Near the Visible from Coronographic Measurements Using Mean or Expected Values

Equations (1)

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I = K - + Ab ( Fe ) · [ ( Fe XIV ) / ( Fe ) ] · ( N e 2 · C + N e · u R ) · ( 1 - ξ ) · d x ,

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