Measurements of Solar Extreme Ultraviolet and X-Rays from Rockets by Means of a CoS<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>4</mn></mrow></msub></mrow></math></span>:Mn Phosphor

R. Tousey; K. Watanabe; J. D. Purcell

doi:10.1103/PhysRev.83.792

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Measurements of Solar Extreme Ultraviolet and X-Rays from Rockets by Means of a CoS $O_{4}$ :Mn Phosphor

R. Tousey, K. Watanabe, and J. D. Purcell

United States Naval Research Laboratory, Washington, D. C.

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Phys. Rev. 83, 792 – Published 15 August, 1951

DOI: https://doi.org/10.1103/PhysRev.83.792

Abstract

The presence of solar extreme ultraviolet and x-rays at high altitudes in the atmosphere was detected by means of a thermoluminescent phosphor, CaS $O_{4}$ :Mn, which was not sensitive to wavelengths above 1340A. Samples of the phosphor were flown in V-2 rockets and exposed to sunlight. By means of filters of Be, LiF, and Ca $F_{2}$ , response was measured in the wavelength bands 0-8A, 1050-1340A, and 1230-1340A. X-rays were observed on one flight which reached 128 km, during which a sudden ionospheric disturbance occurred. Wavelengths between 1050 and 1340A were observed on all four flights and reached as low as 80-90 km. A tentative value of 0.04 microwatt/ ${cm}^{2}$ was calculated for the total intensity in the solar spectrum in the range 1050-1240A, which includes the Lyman alpha-line of hydrogen, at an altitude level somewhere between 82 and 127 km. A similar value for the range 1230-1340A was 0.02 microwatt/ ${cm}^{2}$ . A comparison of the responses of the phosphor strips flown without filters and those with filters indicated that radiation between 795 and 1050A reaches the region 82-127 km with an intensity well above that produced by a 6000°K blackbody sun.

References (18)

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[c1] F. W. P. Götz, Strahlentherapie 40, 690 (1931)

[c2] Baum, Johnson, Oberly, Rockwood, Strain, and Tousey, Phys. Rev. 70, 781 (1946) Naval Research Laboratory Report, No. R-3030, Chapter IV, Sec. A (1946) Durand, Oberly, and Tousey, Phys. Rev. 71, 827 (1947) Naval Research Laboratory Report No. R-3120, Chapter II, Sec. A (1947) Astrophys. J. 109, 1 (1949)

[c3] J. J. Hopfield and H. E. Clearman, Jr., Phys. Rev. 73, 877 (1948)

[c4] K. Watanabe, Phys. Rev. 77, 748(A) (1949) 83, 785 (1951)

[c5] H. B. Maris and E. O. Hulburt, Phys. Rev. 33, 412 (1929)

[c6] B. Edlen, Arkiv. Mat. Astron. Fysik 28, B, 1 (1941)

[c7] Martyn, Munro, Higgs, and Williams, Nature 140, 603 (1937)

[c8] L. Vegard, Naturwiss. 26, 639 (1938)

[c9] W. M. Preston, Phys. Rev. 57, 887 (1940)

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

[c11] R. Penndorf, J. Geophys. Research 54, 7 (1949)

[c12] E. O. Hulburt, Phys. Rev. 53, 344 (1938)

[c13] R. Ladenburg and C. C. Van Voorhis, Phys. Rev. 43, 315 (1933)

[c14] E. G. Schneider, J. Opt. Soc. Am. 30, 128 (1940)

[c15] Havens, Koll, and LaGow, "Pressures and temperatures in the earth's upper atmosphere" (unclassified), Naval Research Laboratory Progress Report (March, 1950)

[c16] S. E. Williams, Nature 145, 68 (1940)

[c17] D. M. Packer and C. Lock, J. Opt. Soc. Am. 40, 264 (1950)

[c18] T. R. Burnight, Phys. Rev. 76, 165 (1949)

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Measurements of Solar Extreme Ultraviolet and X-Rays from Rockets by Means of a CoS $O_{4}$ :Mn Phosphor

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Measurements of Solar Extreme Ultraviolet and X-Rays from Rockets by Means of a CoSO4:Mn Phosphor

Abstract

References (18)

Measurements of Solar Extreme Ultraviolet and X-Rays from Rockets by Means of a CoS $O_{4}$ :Mn Phosphor