Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..36a&link_type=abstract
Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,
Other
Scientific paper
The CCD Solar Astrolabe of the Observatório Nacional at Rio de Janeiro integrates the R2S3 international network of Solar Semidiameter monitoring. In operation since 1997, more than 2,500 observations had been taken yearly, without seasonal interruptions and spanning all heliolatitudes. From the entire sample, we take the series of 16,23 coherent data between years 1998 and 2003. This period contains the maximum and the surroundings of the 23th cycle of solar activity. The average semi-diameter value is 959".163 ± 0".004, but the Kolmogorov-Smirnov Normality Test results non-significant (p-value smaller than 0.01), while the Runs test rejects the random order of data hypothesis to all levels larger than 10exp-4. The data is then treated as a time series, allowing a detailed comparison with time series of estimators of the solar activity: Flare Index, Total Irradiance, Integrated Magnetic Field, Sunspot Number and 10.7cm Radio Flux. The hypothesis of variation of the Semidiameter tied to the solar activity, otherwise being its estimator, was examined through the correlations between the different pairs of pointers. The comparisons are made in three stances: as regard to the smoothed time series, as regard to the peaks and dips correlation, and accounting for phase between the series. Strong correlations between some pairs were obtained, and interpreted as strong physical interaction between them. For the pair Solar Semidiameter and Irradiance the mode of the phase for maximum correlation was calculated for two distinct cases: either for the complete series of data, or leaving off the data relative to the epochs of the two summits of the solar activity cycle. The comparison shows that the Solar Semidiameter responds closely to variations of Irradiance in the conditions where the peaks of activity are considered; inversely, it precedes the variations of Irradiance, by at least one hundred days, when the peak values are discarded, thus indicating the existence of two distinct regimes. We also studied how the Solar Semidiameter varies throughout its latitudes. It was noted that each band of latitude has a different response, even so there is a global variation in time.
Andrei Alexander H.
Boscardin Sergio Calderari
d'Avila Victor A.
Penna Jucira Lousada
Reis Neto E.
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