A statistical analysis of solar flux variations over time scales of solar rotation: 1978–1982

Differences in the temporal behavior of the ultraviolet irradiance at 205 nm and the 10.7-cm radio flux, the ultraviolet irradiance at 121.6 nm, model calculations of the 205-nm irradiance derived from Ca II K plage emission, and the sunspot-blocking function are examined during a 5-year period near the maximum of solar cycle 21. Because of solar rotation the dominant variance in each of these time series occurs at 27 days, but real temporal differences arise because the five solar time series are each formed at different heights within the solar atmosphere and are associated with a variety of solar active region phenomena having different spatial and temporal characteristics on the solar disc. These differences may be important if the ground-based solar activity time series are used instead of the measured UV irradiances in correlation studies of solar variability with atmospheric parameters such as ozone densities and temperature. Recognizing the presence of autocorrelation in the UV irradiance time series is also important in solar terrestrial correlation studies, since it complicates the use of classical statistical techniques for estimating the significance of the results.

[1]  C. Chatfield.  The Analysis of Time Series: An Introduction , 1990 .

[2]  P. Foukal,et al.  The influence of faculae on total solar irradiance and luminosity , 1986 .

[3]  J. Harvey,et al.  Temporal characteristics of the solar UV flux and He I line at 1083 nm , 1985 .

[4]  L. Hood.  The temporal behavior of upper stratospheric ozone at low latitudes: Evidence from Nimbus 4 BUV data for short-term responses to solar ultraviolet variability , 1984 .

[5]  D. Heath,et al.  NIMBUS-7 SBUV (Solar Backscatter Ultraviolet) observations of solar UV spectral irradiance variations caused by solar rotation and active-region evolution for the period November 7, 1978 - November 1, 1980 , 1984 .

[6]  J. Gille,et al.  Observed Ozone Response to Variations in Solar Ultraviolet Radiation , 1984, Science.

[7]  Judson W. Harvey.  Helium 10830 Å irradiance: 1975 - 1983. , 1984 .

[8]  L. Oster.  Solar irradiance variations: 2. Analysis of the extreme ultraviolet measurements onboard the Atmosphere Explorer E satellite , 1983 .

[9]  J. García.  Are the small active regions related to the decay of the larger ones? , 1983 .

[10]  John M. Gottman,et al.  Time Series Analysis: A Comprehensive Introduction for Social Scientists. , 1983 .

[11]  D. B. Preston.  Spectral Analysis and Time Series , 1983 .

[12]  R. Willson,et al.  Very large array observations of solar active regions. III. Multiple wavelength observations , 1983 .

[13]  John Warren Harvey,et al.  Large-scale patterns formed by solar active regions during the ascending phase of cycle 21 , 1983 .

[14]  Andrew Skumanich,et al.  A three‐component model of the variability of the solar ultraviolet flux: 145–200 nM , 1982 .

[15]  C. R. Burnett,et al.  Vertical column abundance of atmospheric OH at solar maximum from Fritz Peak, Colorado , 1982 .

[16]  Douglas V. Hoyt,et al.  An atlas of variations in the solar constant caused by sunspot blocking and facular emissions from 1874 to 1981 , 1982 .

[17]  J. London,et al.  Solar spectral irradiance, 120 to 190nm, October 13, 1981 ‐ January 3, 1982 , 1982 .

[18]  G. Keating.  The response of ozone to solar activity variations: A review , 1981 .

[19]  A. Ebel,et al.  The sun's rotation and perturbations of geopotential height and temperature fields in the stratosphere , 1981 .

[20]  H. Hinteregger,et al.  Observational, reference and model data on solar EUV, from measurements on AE-E , 1981 .

[21]  M. Nicolet,et al.  On the Variability of Lyman-alpha With Solar-activity , 1981 .

[22]  Guenter E. Brueckner,et al.  Variability of the solar flux in the far ultraviolet 1175–2100 Å , 1980 .

[23]  R. S. Quiroz.  Stratospheric temperatures during solar cycle 20 , 1979 .

[24]  D. Samain.  Solar continuum data on absolute intensities, center to limb variations and Laplace inversion between 1400 and 2100 A , 1979 .

[25]  G. Jenkins,et al.  Time Series Analysis: Forecasting and Control , 1978 .

[26]  C. Chatfield,et al.  Fourier Analysis of Time Series: An Introduction , 1977, IEEE Transactions on Systems, Man, and Cybernetics.

[27]  Alice Orcutt Nakamura,et al.  Testing for Relationships between Time Series , 1976 .

[28]  D. K. Prinz.  The spatial distribution of Lyman-$alpha$ on the Sun , 1974 .

[29]  Richard H. Jones.  Spectrum estimation with missing observations , 1971 .

[30]  J. W. Tukey,et al.  The Measurement of Power Spectra from the Point of View of Communications Engineering , 1958 .

[31]  D. Wuebbles.  Trends in ozone and temperature structure: Comparison of theory and measurements , 1985 .

[32]  G. Rottman.  Solar Ultraviolet Irradiance 1982 and 1983 , 1985 .

[33]  C. Fröhlich.  Solar variability for periods of days to months , 1984 .

[34]  J. Lean.  Estimating the variability of the solar flux between 200 and 300 nm , 1984 .

[35]  N. Sheeley.  The overall structure and evolution of active regions , 1981 .

[36]  L. H. Koopmans.  The spectral analysis of time series , 1974 .