Solar irradiance variation near 2075 A

Details Solar irradiance variation near 2075 A Solar irradiance variation near 2075 A

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9677h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 20, 1984, p. 9677, 9678.

Physics

1

Irradiance, Solar Activity, Solar Flux Density, Spectral Energy Distribution, Ultraviolet Spectra, Aluminum, Periodic Variations, Radiation Measurement

Scientific paper

Measurements of solar radiation in the vicinity of the Al I absorption edge at 2075 Å provide a means of comparing the magnitude of the 11-year variation in solar activity with that of the 27-day variation. The ratio of the solar irradiance in the band 2030 - 2070 Å to that in the band 2100 - 2140 Å has been determined from five measurements made in the period 1977 - 1983. This ratio, which is an almost purely relative measurement, avoids the problem of absolute irradiance comparisons over long periods of time. The magnitude of the 11-year effect in this ratio is about ±1%, which is comparable to that in the 27-day effect measured at solar maximum.

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