Short-Term Periodicities in the Time Series of Solar Radio Emissions at Different Solar Altitudes |
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| Authors: | RP Kane Hari Om Vats HS Sawant |
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| Institution: | (1) Instituto Nacional de Pesquisas Espacias – INPE, Caixa Postal 515, 12201-970 São José dos Campos, SP, Brazil |
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| Abstract: | A spectral analysis of the time series of daily values of 12 parameters, namely, ten solar radio emissions in the range 275–1755 MHz, 2800 MHz solar radio flux, and sunspot numbers for six continuous intervals of 132 values each during June 1997–July 1999 showed considerable differences from one interval to the next, indicating a nonstationary nature. A   27-day periodicity was noticed in Interval 2 (26.8 days), 3 (27.0 days), 5 (25.5 days), 6 (27.0 days). Other periodicities were near 11.4, 12.3, 13.3, 14.5, 15.5, 16.5, 35, 40, 50–70 days. Periodicities were very similar in a large vertical span of the coronal region corresponding to 670–1755 MHz. Above this region, the homogeneity disappeared. Below this region, there were complications and distortions due to localized solar surface phenomena. |
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