Abstract
The solar irradiance below 120 nm was first predicted by astronomers. Since its accurate measurement required the solution of a variety of technological problems, little is known about the variability before 1972, though for more than two decades data have been collected. Therefore, on a quantitative basis only a very rough picture can be given for the solar cycle 19. Also, not enough data with sufficient absolute accuracy are available to describe the solar EUV flux variations of the solar cycle 20, especially during the period of solar maximum. However, due to technological improvements of space and laboratory instrumentations, an almost complete set of data has been obtained from 1972 to date. These observations exhibit strong differences of the flux variations from solar cycle 20 to 21. - For the theoretical and for semi-empirical treatments of many aeronomic processes controlled by the solar EUV radiation, its adequate representation e.g. as indices is required. The problems involved and possible solutions are discussed. Results from some relevant aeronomically oriented computations based on variable solar EUV fluxes are presented.
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Delaboudiniere, J. P., Donelly, R. F., Hinteregger, H. E., Schmidtke, G., and Simon, P. C.: 1978, COSPAR Techniques Manual No. 7.
Detwiler, C. R., Purcell, J. D., and Tousey, R.: 1961, Mem. Soc. Roy. Sci. Liège 5, Ser. IV, 254.
Elias, G. J.: 1923, Tijdschr. Nederl. Radio Gen. 2, 1.
Freeman, F. F. and Jones, B. B.: 1970, Solar Phys. 15, 288.
Hall, L. A. and Hinteregger, H. E.: 1970, J. Geophys. Res. 75, 6959.
Heroux, L. and Higgins, J. E.: 1977, J. Geophys. Res. 82, 3307.
Hinteregger, H. E. 1961, J. Geophys. Res. 66, 2367.
Hinteregger, H. E.: 1963, in C. de Jager (ed.), The Solar Spectrum, D. Reidel Publ. Co., Dordrecht, Holland, p. 179.
Hinteregger, H. E. 1976, J. Atmospheric Terrest. Phys. 38, 791.
Hinteregger, H. E. 1977, Geophys. Res. Letters 4, 231.
Hinteregger, H. E. 1978, private communication.
Hinteregger, H. E. 1980, private communication.
Hinteregger, H. E. 1981, Space Research XXI, 39.
Hinteregger, H. E., Hall, L. A., and Schmidtke, G.: 1965, Space Research V, 1175.
Johnson, F. S., Malitson, H. H., Purcell, J. D., and Tousey, R.: 1958, Astrophys. J. 127, 80.
Kiepenheuer, K. O.: 1945, Ann. Astrophys. 8, 210.
Kreplin, R. W., Dere, K. P., Horan, D. M., and Meeking, J. F.: 1977, in O. White (ed.), The Solar Output and its Variation, Colorado Assoc. Univ. Press, Blouder, Colorado, p. 287.
Manson, J. E.: 1977, in O. White (ed.), The Solar Output and its Variation, Colorado Assoc. Univ. Press, Boulder, Colorado, p. 261.
Neupert, W. M., Behring, W. E., and Lindsay, J. C.: 1964, Space Research IV, 719.
Saha, N.: 1937, Proc. Roy. Soc. A160, 155.
Schmidtke, G.: 1976, Geophys. Res. Letters 3, 573.
Schmidtke, G.: 1978, Planetary Space Sci. 26, 347.
Schmidtke, G.: 1979a, Daily Solar EUV Intensities obtained during the AEROS-A Mission, Report IPW-W.B.11, Institut für Physikalische Weltraumforschung.
Schmidtke, G.: 1979b, Space Research XIX, 193.
Schmidtke, G., and Schweizer, W.: 1972, Sonnenbeobachtung und -forschung mit Raketen, Bundesforschungsbericht W 72-27, 31.
Schmidtke, G., Börsken, N., and Sünder, G.: 1981, J. Geophys. 49, 146.
Schweizer W. and Schmidtke, G.: 1971, Astrophys. J. 169, L27.
Schwenn, R.: 1981, Space Research XXI, 3.
Timothy, J. G.: 1977, in O. White (ed.), The Solar Output and its Variations, Colorado Assoc. Univ. Press, Boulder, Colorado, p. 237.
Timothy, A. F. and Timothy, J. G.: 1970, J. Geophys. Res. 75, 6950.
Torr, M. R., Richards, P. G., and Torr, D. G.: 1981, Space Research XXI, 53.
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Proceedings of the 14th ESLAB Symposium on Physics of Solar Variations, 16–19 September 1980, Scheveningen, The Netherlands.
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Schmidtke, G. Solar irradiance below 120 nm and its variations. Sol Phys 74, 251–263 (1981). https://doi.org/10.1007/BF00151294
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DOI: https://doi.org/10.1007/BF00151294