On the periodicity of solar great hard X-ray bursts, energic solar radio bursts and sunspot data

Abstract

In the last solar maximum period (cycle 21) the 152-158 day periodicity was found in the occurrence rate of solar flares through solar gamma ray, microwave, soft X-ray, hard X-ray and H-alpha flares. In the present, brief communication we report the confirmation of 152-158 day periodicity through solar great hard X- ray and energetic radio bursts.