A search for five month solar induced periodicity in the stratosphere

Details A search for five month solar induced periodicity in the stratosphere A search for five month solar induced periodicity in the stratosphere

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..711c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 711-714.

Physics

6

Ozonometry, Periodic Variations, Solar Terrestrial Interactions, Stratosphere, Ultraviolet Spectra, Centimeter Waves, Middle Atmosphere, Nimbus 7 Satellite, Power Spectra, Solar Spectra

Scientific paper

Recent studies of solar UV spectra and various indices of solar activity indicate a strong period at about 5 months. In the 10.7 cm solar radio flux (F10.7), a conventional index for the solar EUV and UV variabilities, the spectral power of the 5 month period is comparable to the well known 27 day solar period. However, in the solar UV flux at 205 nm, directly measured from the Nimbus-7 SBUV spectrometer, the (spectral) power of the 5 month period is about half that of the 27 day period. This paper examines the possible impact of the 5 month solar period on ozone and temperature at various pressure levels in the stratosphere and discusses the implications of differences in solar forcing at the 27 day and 5 month periods. It is shown that ozone, both in the lower and the upper stratosphere, has a measurable response to solar UV forcing at 27 days. Such a solar response is not observed at 5 month period because of a relatively weaker 5 month solar UV component in the solar signal and a strong interference from dynamical signals associated with planetary wave activity.

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