Short-term periodicities in the downward longwave radiation and their associations with cosmic ray and solar interplanetary data

In this study downward longwave (LW) atmospheric radiation data for the period of 2014–2020 were used to search short-term periodicities using fast Fourier transform (FFT). Several local peaks in power spectrum density found and established. The time series exhibits a significant (exceeding 95% confidence limit), such as at 273 days, 227 200 178 157 110 120 87 73 53–56 35–30 25–27 21 13 9–10 days. Moreover, cosmic ray from KACST muon detector Oulu neutron monitor, well solar radio flux 10.7 cm (F10.7 cm), Dst index, wind speed same LW data, look common cyclic variations matching those radiation. This was done investigate possible effect activity parameters on observed spectra all variables considered, 154–157 Some can be attributed modulation intensity by activity. Others are disturbances interplanetary magnetic field. Based spectral results, we suggest that signals may directly or indirectly affect radiation, which turn climate change.