Abstract

This study consists of the quantitative observation of the distribution of harmonic components of scintillation with frequency. Examples of preliminary results at frequencies ranging from 10 to 800 cycles per second are used to exhibit changes in this frequency distribution with visual seeing, zenith distance of the observed object, altitude above sea level, size of circular aperture, and orientation of rectangular aperture. Motion pictures of shadows on a 40-inch mirror caused by atmospheric disturbances which produce scintillation indicate that these shadows have a transitory nature. Motion pictures of Hartmann images demonstrate changes of size, shape, and brightness (scintillation) of stellar images formed as light from the same star passes through four widely-separated apertures in front of the 40-inch mirror. Color scintillation is demonstrated with tracings from a dual-beam oscillograph. Other tracings show that scintillating starlight is not polarized.

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Anderson, J. A.

J. A. Anderson, J. Opt. Soc. Am. 25, 152 (1935).

Butler, H. E.

H. E. Butler, Observatory 70, 235 (1950) and 71, 28 (1951); Nature 167, 287 (1951).

Couder, André

André Danjon and André Couder, Lunettes et Tlescopes (Editions de la Revue D'Optique Theorique et Instrumentale, Paris, 1935), pp. 72–94.

Danjon, André

André Danjon and André Couder, Lunettes et Tlescopes (Editions de la Revue D'Optique Theorique et Instrumentale, Paris, 1935), pp. 72–94.

Ellison, M. A.

M. A. Ellison and R. Wilson, Observatory 71, 26 (1951).

Engstrom, R. W.

R. W. Engstrom, J. Opt. Soc. Am. 37, 425 (1947).

Exner, F. M.

J. M. Pernter and F. M. Exner; Meteorologische Optik (Braumüller, Vienna and Leipzig, 1922), second edition, pp. 188–241.

Gaviola, E.

E. Gaviola, Astron. J. 54, 155 (1949) and Popular Astron. 56, 353 (1948).

Goldie, A. H. R.

A. H. R. Goldie, Nature 165, 1019 (1950).

Goldstein, E.

E. Goldstein, Naval Research Lab. Reports, N-3462 (1949), and N-3710 (1950).

Gregory, C. C. L.

C. C. L. Gregory, Nature 165, 146 (1950).

Hartridge, H.

H. Hartridge, Nature 166, 151 (1950).

H. Hartridge and R. Weale, Nature 164, 999 (1949).

Houtgast, J.

M. Minnaert and J. Houtgast, Z. für Astrophys. 10, 86 (1935).

Megaw, E. C. S.

E. C. S. Megaw, Nature 166, 1100 (1950).

Minnaert, M.

M. Minnaert, Nature 165, 663 (1950).

M. Minnaert and J. Houtgast, Z. für Astrophys. 10, 86 (1935).

Pernter, J. M.

J. M. Pernter and F. M. Exner; Meteorologische Optik (Braumüller, Vienna and Leipzig, 1922), second edition, pp. 188–241.

Pierce, J. R.

W. Shockley and J. R. Pierce, Proc. Inst. Radio Engrs. 26, 321 (1938).

Sard, R. D.

R. D. Sard, J. Appl. Phys. 17, 768 (1946).

Schlesinger, F.

F. Schlesinger, Publ. Alleghany Obs. 3, 1 (1916) and Monthly Notices Roy. Astron. Soc. 87, 510 (1927).

Shockley, W.

W. Shockley and J. R. Pierce, Proc. Inst. Radio Engrs. 26, 321 (1938).

Stebbins, J.

A. E. Whitford and J. Stebbins, Publ. Am. Astron. Soc. 8, 228 (1936). Sky and Telescope 3, No. 4, 5 (1944).

Strömgren, B.

B. Strömgren, Mat. Tids. B 1945, Pt. 1, 15 (1945).

Weale, R.

H. Hartridge and R. Weale, Nature 164, 999 (1949).

Whitford, A. E.

A. E. Whitford and J. Stebbins, Publ. Am. Astron. Soc. 8, 228 (1936). Sky and Telescope 3, No. 4, 5 (1944).

Wilson, R.

M. A. Ellison and R. Wilson, Observatory 71, 26 (1951).

Zwicky, F.

F. Zwicky, Publ. Astron. Soc. Pacific 62, 150 (1950).

Other (21)

J. M. Pernter and F. M. Exner; Meteorologische Optik (Braumüller, Vienna and Leipzig, 1922), second edition, pp. 188–241.

André Danjon and André Couder, Lunettes et Tlescopes (Editions de la Revue D'Optique Theorique et Instrumentale, Paris, 1935), pp. 72–94.

J. A. Anderson, J. Opt. Soc. Am. 25, 152 (1935).

F. Zwicky, Publ. Astron. Soc. Pacific 62, 150 (1950).

E. Gaviola, Astron. J. 54, 155 (1949) and Popular Astron. 56, 353 (1948).

A. E. Whitford and J. Stebbins, Publ. Am. Astron. Soc. 8, 228 (1936). Sky and Telescope 3, No. 4, 5 (1944).

H. E. Butler, Observatory 70, 235 (1950) and 71, 28 (1951); Nature 167, 287 (1951).

M. A. Ellison and R. Wilson, Observatory 71, 26 (1951).

M. Minnaert and J. Houtgast, Z. für Astrophys. 10, 86 (1935).

B. Strömgren, Mat. Tids. B 1945, Pt. 1, 15 (1945).

H. Hartridge and R. Weale, Nature 164, 999 (1949).

C. C. L. Gregory, Nature 165, 146 (1950).

M. Minnaert, Nature 165, 663 (1950).

A. H. R. Goldie, Nature 165, 1019 (1950).

H. Hartridge, Nature 166, 151 (1950).

E. C. S. Megaw, Nature 166, 1100 (1950).

F. Schlesinger, Publ. Alleghany Obs. 3, 1 (1916) and Monthly Notices Roy. Astron. Soc. 87, 510 (1927).

E. Goldstein, Naval Research Lab. Reports, N-3462 (1949), and N-3710 (1950).

R. D. Sard, J. Appl. Phys. 17, 768 (1946).

R. W. Engstrom, J. Opt. Soc. Am. 37, 425 (1947).

W. Shockley and J. R. Pierce, Proc. Inst. Radio Engrs. 26, 321 (1938).

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