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On the periodicities of sunspots and solar strong hard X-ray bursts

  • Solar Physics Letter
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Abstract

In the present investigation, we have carried out power spectrum analysis of sunspot number and great hard x-ray (GHXR) burst (equal to or greater than 10,000 counts per second) for a period of about 6 years. The GHXR bursts show a periodicity of about 155 days. On the other hand, sunspot numbers do not show any periodicity. The GHXR burst periodicity confirms the existence of a 152–158 days periodicity in the occurrence of solar energetic events. Further, the GHXR bursts are showing periodicity independently indicating that the GHXR bursts are a separate class of X-ray flares.

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Authors and Affiliations

  1. Uttar Pradesh State Observatory, Manora Peak, 263 129, Naini Tal, India

    V. K. Verma & G. C. Joshi

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  1. V. K. Verma
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  2. G. C. Joshi
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Verma, V.K., Joshi, G.C. On the periodicities of sunspots and solar strong hard X-ray bursts. Sol Phys 114, 415–418 (1987). https://doi.org/10.1007/BF00167358

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  • DOI: https://doi.org/10.1007/BF00167358

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