Ionospheric Absorption by <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">N</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> of Certain Extreme Ultraviolet Solar Wavelengths

K. C. Clark

doi:10.1103/PhysRev.87.271

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Ionospheric Absorption by $N_{2}$ and $O_{2}$ of Certain Extreme Ultraviolet Solar Wavelengths

K. C. Clark

University of Washington, Seattle, Washington

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Phys. Rev. 87, 271 – Published 15 July, 1952

DOI: https://doi.org/10.1103/PhysRev.87.271

Abstract

Measurements are reported of the coefficients of absorption by the gases $N_{2}$ and $O_{2}$ of the emission from the H Lyman series 2-7, the resonance line 584A of He I, and twenty lines of $H_{2}$ between 980A and 850A, the atomic lines likely being strong in solar radiation. For an atmosphere of constant relative composition the absorption coefficients are related to the atmospheric heights of maximum photoionization and maximum electron concentration by equations which allow for a constant temperature gradient, the inverse square decrease of gravity, and a recombination process which may vary with height. With these laboratory measurements for $N_{2}$ and $O_{2}$ and the known calculated absorption for O, ionosphere layer heights are computed for the simple case which assumes complete $O_{2}$ dissociation above 100 km, no $N_{2}$ dissociation, and two-body recombination. Although only the first assumption is probably secure, it appears that photoionization is capable of producing layers at heights which agree with observation.

References (37)

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[c1] D. R. Bates and H. S. W. Massey, Proc. Roy. Soc. (London) A187, 261 (1946)

[c2] A. Hunter, Repts. Prog. Phys. (The Physical Society, London) 9, 8 (1942)

[c3] L. Spitzer, Jr., contributor, The Atmospheres of the Earth and Planets (University of Chicago Press, Chicago, Illinois, 1949), Chapter 7

[c4] R. N. Sedra, Phys. Rev. 83, 190 (1951)

[c5] Tousey, Watanabe, and Purcell, Phys. Rev. 83, 792 (1951)

[c6] J. J. Hopfield and H. E. Clearman, Phys. Rev. 73, 877 (1948)

[c7] Durand, Oberley, and Tousey, Astrophys. J. 109, 1 (1949)

[c8] W. M. Preston, Phys. Rev. 57, 887 (1940)

[c9] G. L. Weissler, conversations, June, 1951

[c10] O. R. Wulf and L. S. Deming, Terr. Magn. Atmos. Elect. 43, 283 (1938)

[c11] H. E. Moses and Ta-You Wu, Phys. Rev. 83, 109 (1951)

[c12] A. B. Meinel, Repts. Prog. Phys. (The Physical Society, London) 14, 121 (1951)

[c13] M. N. Saha and R. N. Rai, Proc. Natl. Inst. Sci. India 1, 227 (1938), [1]

[c14] D. R. Bates, Monthly Notices Roy. Astron. Soc. 100, 25 (1939) ibid.106, 432, 509 (1946)

[c15] Weissler, Lee, and Mohr, J. Opt. Soc. Am. 42, 84, 200 (1952)

[c16] E. G. Schneider, J. Opt. Soc. Am. 30, 128 (1939)

[c17] Takamine, Suga, and Tanaka, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 34, 854 (1938)

[c18] R. E. Worley, Phys. Rev. 64, 207 (1943)

[c19] W. C. Price and G. Collins, Phys. Rev. 48, 715 (1935)

[c20] J. J. Hopfield, Astrophys. J. 104, 208 (1946)

[c21] T. Takamine and T. Suga, Sci. Papers Inst. Phys. Chem. Research (Tokyo) 29, 213 (1936)

[c22] R. W. Wood and T. Lyman, Phil. Mag. 2, 310 (1926)

[c23] C. R. Jeppeson, Phys. Rev. 44, 165 (1933)

[c24] C. N. Warfield, Tech. Note No. 1200 (N.A.C.A., Langley Field, Virginia, 1947)

[c25] R. Wildt, Revs. Modern Phys. 14, 152 (1942)

[c26] L. Vegard, contributor, The Emission Spectra of the Night Sky and Aurorae (The Physical Society, London, 1948), p. 82

[c27] N. C. Gerson, Repts. Prog. Phys. (The Physical Society, London) 14, 316 (1951)

[c28] L. M. Branscomb, Phys. Rev. 79, 619 (1950)

[c29] D. R. Bates, Proc. Phys. Soc. (London) B64, 805 (1951)

[c30] R. v. d. R. Woolley, Proc. Roy. Soc. (London) A189, 219 (1947)

[c31] J. A. Gledhill and M. E. Szendrei, Proc. Phys. Soc. (London) B63, 427 (1950)

[c32] M. Nicolet, J. Atmos. Terr. Phys. 1, 141 (1951)

[c33] S. K. Mitra, The Upper Atmosphere (Royal Asiatic Society of Bengal, Calcutta, India, 1947), Chapter 1

[c34] R. v. d. R. Woolley and C. W. Allen, Monthly Notices Roy. Astron. Soc. 108, 292 (1948)

[c35] Friedman, Lichtman, and Byram, J. Opt. Soc. Am. 41, 292 (1951)

[c36] D. R. Bates, Proc. Roy. Soc. (London) A196, 562 (1949)

[c37] G. Herzberg, Nature 161, 283 (1948)

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Ionospheric Absorption by $N_{2}$ and $O_{2}$ of Certain Extreme Ultraviolet Solar Wavelengths

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Ionospheric Absorption by N2 and O2 of Certain Extreme Ultraviolet Solar Wavelengths

Abstract

References (37)

Ionospheric Absorption by $N_{2}$ and $O_{2}$ of Certain Extreme Ultraviolet Solar Wavelengths