Fluctuations in the ~27-day sequences in the solar index F10 during solar cycles 22-23

Physics

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Solar Radio Emission, 2800Mhz Solar Flux, 27-Day Periodicity, Solar Cycle 22, Solar Cycle 23

Scientific paper

A study of the daily values of the 10.7cm (2800MHz, F10) solar radio flux revealed fluctuations with peak spacings in a very wide range (~13-40 days). There can be multiple reasons for such a wide range. Amongst these, there is a possibility that the dominant radiance within an active region may move rapidly forward or backward with respect to the solar surface, to give spacings different from ~27 days (solar rotation period). This needs to be checked with an actual image analysis. An earlier conclusion by Pap et al. (Solar Phys. (1990) 165) that 27-day solar rotation is more pronounced in the declining phase of a solar cycle, seems to be true for cycles 22-23 also. However, during any year, the magnitudes of the 27-day oscillation can vary by more than a factor of two from one oscillation to another.

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