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Scientists Report Periodic and Temporal Behaviors of Solar X-Ray Flares in Solar Cycles 23 and 24

Apr 15, 2019     Email"> PrintText Size

An international doctoral student from Yunnan Observatories of Chinese Academy of Sciences, J. Oloketuyi, observed that solar X-ray flares responded differently to the emergence of sunspot groups, and reported the findings in The Astrophysical Journal.

A total of 36354 flares events were recorded in his paper. The B and C flares account for over 90% of the total flare eruptions. The report covered the most two recent solar cycles 23 and 24.

The B flares responded to the sunspot group emergence by deviating whenever the sunspot group numbers rise or fall around 100. The B flares then form a cyclic variation around 5 years similar to the 11 years of the solar cycle. However, the B-flares correlated negatively with the sunspot group numbers.

On the other hand, for the C flares, it seems to be consistent with the emergence of the sunspot numbers so that the flare could be accurately predicted using the sunspot numbers. The C flares have a positive correlation coefficient of 0.868, the highest point obtained among all the flares analysed.

The differences in response from the solar flare classes in their variations, correlations and cycles also raise questions on mechanisms of their sources and eruptions from the solar corona.

This discovery would offer more insights and information about the emergence of sunspots and the solar magnetic flux.

(Editor: LIU Jia)


J. Oloketuyi

Yunnan Observatories

E-mail: jacob.oloketuyi@ynao.ac.cn

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