Mathematics – Probability
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sunge...2...56k&link_type=abstract
Sun and Geosphere, vol.2, no. 1, p. 56-60.
Mathematics
Probability
1
Scientific paper
Results from videospectrometric investigations of the solar radiation during the total solar eclipse on 11 August 1999 in the territory of Bulgaria are presented. The spectral distribution and integral changes in the solar radiation reaching the Earth's surface as well as images of the Sun's disk were registered from an observation post on the line of totality situated on the Black Sea coast. The solar radiation was measured by means of a high-resolution multi-channel spectrometer and a photometer. Black and white images of the Sun's disk were taken using a television CCD-camera through a neutral filter. The examination of the solar radiation dynamics revealed presence of fluctuations in the recorded spectral distributions before and after the eclipse totality expressed in a weak redistribution of the solar energy in the spectral range (480-810 nm) in the limits of 1-2%. The joint processing of spectrometric, photometric and videometric data disclosed a high correlation (R ˜ 0.9985) between the integral and spectral changes of solar radiation with time as well as a concomitant correlation between the solar radiation intensity and the changes in the area and the brightness of the unshaded part of the solar disk in the time interval before and after the totality. The applied statistical method (Students' t-criterion) proved statistically significant differences at a probability level of p<0.001 between the spectral distribution of the solar radiation recorded at time intervals disposed equidistantly before and after the eclipse totality.
Krezhova Dora D.
Krumov A. H.
Yanev Tony K.
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