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Calculated upper stratospheric effects of solar UV flux and NO Y variations during the 11‐year solar cycle
Author(s) -
Callis Linwood B.,
Natarajan Murali,
Lambeth James D.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011622
Subject(s) - solar cycle , solar rotation , atmospheric sciences , solar cycle 22 , environmental science , flux (metallurgy) , physics , solar minimum , solar maximum , solar physics , astrophysics , solar wind , materials science , quantum mechanics , magnetic field , metallurgy
Model derived sensitivities of O 3 near 40 km to solar UV flux changes (11‐year and 27‐day) fall within the range 0.36–0.55 with S 11y ≈ S 27d . These sensitivities derived from observations have been reported to be 0.91 and 0.39–0.46, respectively. This discrepancy appears to be due to long‐term (2–10 years) fluctuations in stratospheric NO 2 in the 1980s. Such fluctuations, if not taken into account in the analysis of the data, could lead to high values of the sensitivity for the 11‐year activity cycle but not for the 27‐day solar rotation period. Simulations accounting for such effects suggest a consistency between theoretical values of S 11y and those derived from data if NO 2 effects are included. The appropriate values are approximately 0.48, a value similar to published model calculations and results from the analysis of data from the 27‐day solar rotation period. Verification of this suggestion awaits an NO 2 data base of sufficient quality and length to permit solar‐cycle trend calculations to be made.