Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8815753d&link_type=abstract
Unknown
Physics
Irradiance, Periodic Variations, Photochemical Reactions, Solar Spectra, Ultraviolet Spectra, Atmospheric Heating, Heat Flux, Solar Rotation, Spectrum Analysis, Stratosphere
Scientific paper
NIMBUS-7 measurements of the solar spectral irradiance in the 160 to 400 nm range during Nov. 7, 1978 to Oct. 29, 1984 were analyzed to determine the characteristics of their short term variations. The persistance of solar-rotational variations is shown to be uniformly high for the UV wavelengths important for inducing stratospheric photochemical reactions and for heating the stratosphere, which contrasts greatly with the low and nonuniform persistence for coronal EUV wavelengths and the standard ground based measures of solar variability, the Ottawa 10.7 cm flux (F10) and sunspot number (R). Periodicity in the 13 to 14 day range is the second strongest short term variation (27 to 28 day solar rotational variations are the strongest short term periodicity). The ratios of power in the 13 day periodicity to that in the 27 day periodicity is fairly constant for photospheric UV fluxes throughout the 170 to 260 nm wavelength range, the main exception being the chromospheric Si II lines in the 180 to 182 nm range.
Barrett James
Donnelly R. E.
Pfendt K.
Stevens Donna E.
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