Abstract

Descriptions are given of Fabry-Perot spectrometer systems used in the total eclipses of 1965, 1966, and 1970 to observe the emission lines 5303 Å, Fe xiv and 6374 Å, Fe x at different points in the solar corona. Some results of coronal temperature measurements for the 12 November 1966 eclipse are presented.

© 1970 Optical Society of America

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References

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  1. A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 115, 343 (1955).
  2. A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 122, 223 (1961).
  3. A. B. Delone, E. A. Makarova, Solar Phy. 9, 116 (1969).
    [CrossRef]
  4. D. H. Liebenberg, Proceedings of 123rd Meeting of the American Astronomical Society, 27–30 December 1966, at University of California, Los Angeles, Calif.
  5. P. Jacquinot, J. Opt. Soc. Amer. 44, 761 (1954).
    [CrossRef]
  6. J. F. James, R. S. Sternberg, The Design of Optical Spectrometers (Chapman and Hall, Ltd., London), p. 95et seq.
  7. A. H. Vaughan, Ann. Rev. Astron. Astrophys. 5, 139 (1967).
    [CrossRef]
  8. A. Unsöld, Z. Astrophys. 50, 48 (1960).
  9. P. N. Slater, H. T. Betz, G. Henderson, Jap. J. Appl. Phys. 4, Suppl. 1, 440 (1965).

1969 (1)

A. B. Delone, E. A. Makarova, Solar Phy. 9, 116 (1969).
[CrossRef]

1967 (1)

A. H. Vaughan, Ann. Rev. Astron. Astrophys. 5, 139 (1967).
[CrossRef]

1965 (1)

P. N. Slater, H. T. Betz, G. Henderson, Jap. J. Appl. Phys. 4, Suppl. 1, 440 (1965).

1961 (1)

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 122, 223 (1961).

1960 (1)

A. Unsöld, Z. Astrophys. 50, 48 (1960).

1955 (1)

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 115, 343 (1955).

1954 (1)

P. Jacquinot, J. Opt. Soc. Amer. 44, 761 (1954).
[CrossRef]

Betz, H. T.

P. N. Slater, H. T. Betz, G. Henderson, Jap. J. Appl. Phys. 4, Suppl. 1, 440 (1965).

Delone, A. B.

A. B. Delone, E. A. Makarova, Solar Phy. 9, 116 (1969).
[CrossRef]

Henderson, G.

P. N. Slater, H. T. Betz, G. Henderson, Jap. J. Appl. Phys. 4, Suppl. 1, 440 (1965).

Jacquinot, P.

P. Jacquinot, J. Opt. Soc. Amer. 44, 761 (1954).
[CrossRef]

James, J. F.

J. F. James, R. S. Sternberg, The Design of Optical Spectrometers (Chapman and Hall, Ltd., London), p. 95et seq.

Jarrett, A. H.

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 122, 223 (1961).

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 115, 343 (1955).

Liebenberg, D. H.

D. H. Liebenberg, Proceedings of 123rd Meeting of the American Astronomical Society, 27–30 December 1966, at University of California, Los Angeles, Calif.

Makarova, E. A.

A. B. Delone, E. A. Makarova, Solar Phy. 9, 116 (1969).
[CrossRef]

Slater, P. N.

P. N. Slater, H. T. Betz, G. Henderson, Jap. J. Appl. Phys. 4, Suppl. 1, 440 (1965).

Sternberg, R. S.

J. F. James, R. S. Sternberg, The Design of Optical Spectrometers (Chapman and Hall, Ltd., London), p. 95et seq.

Unsöld, A.

A. Unsöld, Z. Astrophys. 50, 48 (1960).

Vaughan, A. H.

A. H. Vaughan, Ann. Rev. Astron. Astrophys. 5, 139 (1967).
[CrossRef]

von Klüber, H.

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 122, 223 (1961).

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 115, 343 (1955).

Ann. Rev. Astron. Astrophys. (1)

A. H. Vaughan, Ann. Rev. Astron. Astrophys. 5, 139 (1967).
[CrossRef]

J. Opt. Soc. Amer. (1)

P. Jacquinot, J. Opt. Soc. Amer. 44, 761 (1954).
[CrossRef]

Jap. J. Appl. Phys. (1)

P. N. Slater, H. T. Betz, G. Henderson, Jap. J. Appl. Phys. 4, Suppl. 1, 440 (1965).

Monthly Notices Roy. Astron. Soc. (2)

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 115, 343 (1955).

A. H. Jarrett, H. von Klüber, Monthly Notices Roy. Astron. Soc. 122, 223 (1961).

Solar Phy. (1)

A. B. Delone, E. A. Makarova, Solar Phy. 9, 116 (1969).
[CrossRef]

Z. Astrophys. (1)

A. Unsöld, Z. Astrophys. 50, 48 (1960).

Other (2)

J. F. James, R. S. Sternberg, The Design of Optical Spectrometers (Chapman and Hall, Ltd., London), p. 95et seq.

D. H. Liebenberg, Proceedings of 123rd Meeting of the American Astronomical Society, 27–30 December 1966, at University of California, Los Angeles, Calif.

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Figures (18)

Fig. 1
Fig. 1

The optical arrangement of the Fabry-Perot spectrometer.

Fig. 2
Fig. 2

The limitation of a Fabry-Perot passbands by the use of a prefilter.

Fig. 3
Fig. 3

The optical arrangement used to observe the λ 5303 Å, Fe xiv, coronal emission during the eclipse of 30 May 1965.

Fig. 4
Fig. 4

The arrangement of the variable wedge assembly.

Fig. 5
Fig. 5

The Fabry-Perot spectrometer as used in the 1965 eclipse.

Fig. 6
Fig. 6

The optical layout of the aircraft installation to observe the 1966 eclipse.

Fig. 7
Fig. 7

The arrangement of two Fabry-Perot spectrometers for simultaneous observation of the green and red coronal emission lines.

Fig. 8
Fig. 8

The 1966 eclipse equipment installed on board the air-craft. The gyrostabilized heliostat is in the right upper fore-ground and the observation port is immediately above it, out of view.

Fig. 9
Fig. 9

The automatic variable wedge used for scanning the corona. One of the microswitches which gave electrical position signals can be seen. The drive motor is in center of the picture.

Fig. 10
Fig. 10

The inside of the spectrometer box in the 1966 eclipse. The prefilters lie in the recessed apertures above the mirrors.

Fig. 11
Fig. 11

The form of the raw data obtained in the 1966 eclipse. The two upper traces show the output from the λ6374 Å spectrometer which had a failure at totality. The two lower noisy traces show the λ5303 Å emission. The stepped trace indicates coronal position, and the sloping trace indicates wavelength. Some of the traces have been overexposed to enhance the signal trace.

Fig. 12
Fig. 12

Profiles of Hg λ5461 Å emission taken immediately after totality during the 1966 eclipse.

Fig. 13
Fig. 13

Coronal temperatures obtained during the 12 November 1966 eclipse from Fe xiv λ5303 Å emission line widths. Temperatures are in K × 10−6. Decimal points indicate position for each reading.

Fig. 14
Fig. 14

The optical system used to observe the eclipse of 7 March 1970; a is the coelostat, b the auxiliary, c the paraboloid, d the diagonal flat, e the focal plane, f the spectrometer box.

Fig. 15
Fig. 15

The site installation at the eclipse of 7 March 1970 in Mexico. The coelostat is in the foreground.

Fig. 16
Fig. 16

Another view of the 1970 eclipse installation. The rear of the auxiliary mirror is in the foreground.

Fig. 17
Fig. 17

The piezoelectric Fabry-Perot spectrometers used in the 1970 eclipse. Underneath can be seen the dichroic beam splitter at left and the final mirror at right.

Fig. 18
Fig. 18

Form of the raw data obtained for λ5303 Å emission during the 7 March 1970 eclipse. The free spectral range is 4.0 Å. Scanning rate was one sweep per 4 sec.

Tables (2)

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Table I Fe xiv Emission Line Half-widths and Temperatures

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Table II Fe xiv Emission Line Half-widths and Temperatures

Equations (2)

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Δ λ obs 2 = Δ λ line 2 + Δ λ instrument 2 ,
T = Δ λ 2 M / ( 7.16 × 10 - 7 λ ) 2 ,

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