Nivaor Rodolfo Rigozo

Sunspot number, solar activity index

On ´ umero de manchas solares ´ondice mais antigo da atividade solar, com observac ¸˜ oes de manchas solares estendendo-se desde 1611. Ele serve como uma medida da atividade magnetica geral do Sol. Neste trabalho apresentamos uma descric ¸˜ ao das caracter´osticas f´ osicas das manchas solares, a definic ¸˜ ao do numero de manchas solares, uma analise espectral do mesmo e uma reconstruc ¸˜ ao de 1000 anos. The sunspot number is the longest solar activity index available with observations since 1611. It is a measure of the general state of solar magnetic activity. In this work we present a desciption of sunspot physical caracte- ristics, the definition of the sunspot number, a spectral analysis and a reconstruction for the last 1000 years of the sunspot number.

Reconstruction and searching ozone data periodicities in southern Brazil (29ºS, 53ºW)

Ozone plays a very important role in the nature due its characteristics as a natural filter of ultraviolet solar radiation. Thus, it is pertinent for the scientific community to understand all natural influence factors involving ozone along with a large time series. In this work, a reconstruction of ozone time series obtained by Brewer spectrophotometer from 1994 to 2008 at the Southern Space Observatory (SSO) - 29oS, 53oW - Southern Brazil is presented. TOMS-OMI data were used to follow the days without data, where a coefficient of correlation between TOMS-OMI and Brewer is acceptable around r = 0.89. Besides, wavelet analysis to determine the temporal evolution of the frequencies and the amplitudes was applied. Moreover, wavelet analysis aiming to determine the temporal evolution of the frequencies and the amplitudes was performed. The results pointed a period of 365 days (1 yr) for the seasonal variation of ozone, of 600 days attributed for a possible QBO influence and two periods of 2000 and other 4000 days regarding possibly to the second harmonic of the 11-year solar cycle.