@Article{SilvaFoSilvCors:2016:AuUlRa,
author = "Silva Filho, Paulo Cavalcante and Silva, Francisco Raimundo da and
Corso, G.",
affiliation = "Instituto Federal de Educa{\c{c}}{\~a}o, Ci{\^e}ncia e
Tecnologia Do Rio Grande Do Norte (IFRN) and {Instituto Nacional
de Pesquisas Espaciais (INPE)} and {Universidade Federal do Rio
Grande do Norte (UFRN)}",
title = "Autocorrelation in ultraviolet radiation measured at ground level
using detrended fluctuation analysis",
journal = "Physica A: Statistical Mechanics and its Applications",
year = "2016",
volume = "453",
pages = "264--270",
month = "July",
keywords = "Climate, Detrended fluctuation analysis, Long-range correlation,
Solar radiation, Ultraviolet radiation.",
abstract = "In this study, we analyzed the autocorrelation among four
ultraviolet (UV) radiation data sets obtained at 305 nm, 320 nm,
340 nm, and 380 nm. The data were recorded at ground level at the
INPE climate station in Natal, RN, Brazil, which is a site close
to the equator. The autocorrelations were computed by detrended
fluctuation analysis (DFA) to estimate the index \α. We
found that the fluctuations in the UV radiation data were fractal,
with scale-free behavior at a DFA index \α\≃0.7. In
addition, we performed a power law spectral analysis, which showed
that the power spectrum exhibited a power law behavior with an
exponent of \β\≃0.45. Given that the theoretical
result is \β=2\α-1, these two results are in good
agreement. Moreover, the application of the DFA method to the UV
radiation data required detrending using a polynomial with an
order of at least eight, which was related to the complex daily
solar radiation curve obtained at ground level in a tropical
region. The results indicated that the \α exponent of UV
radiation is similar to other climatic records such as air
temperature, wind, or rain, but not solar activity.",
doi = "10.1016/j.physa.2016.01.039",
url = "http://dx.doi.org/10.1016/j.physa.2016.01.039",
issn = "0378-4371",
language = "en",
targetfile = "silva_autocorrelation.pdf",
urlaccessdate = "27 abr. 2024"
}