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Correlation analysis between the occurrence of epidemic in ancient China and solar activity

April 18th, 2023
Correlation analysis between the occurrence of epidemic in ancient China and solar activity
The time series of decadal epidemic indices (top panel), comparisons of sunspot numbers (blue lines in the bottom panel, decadal interval data) and epidemic indices (black lines in the bottom panel, decadal interval data) from AD 0 to 1840. Credit: Science China Press

During the historical civilization of ancient China, the records of epidemics are abundant but intricate. In a study published in the journal Science China Earth Sciences, the records of epidemics for the past 2000 years were compiled and analyzing these data can help people find some principles for the modern human health care system. This study collected the epidemic records from AD 0 to 1840 to explore the relationship between epidemic and solar activity.

In order to investigate the relationships between epidemic indices and solar activity, the team applied the wavelet analysis and ensemble empirical mode decomposition. Results of wavelet analysis illustrate that solar activity and epidemics have highly consistent variations in long-term trends and short-term cycles. From the ensemble empirical mode decomposition results, it can be roughly seen that they are consistent with the wavelet results.

The impact of solar activity on the epidemic may be diverse, resulting from the superposition of global and regional influences. In different phases of solar activity, the change of the sun itself is not unilateral. Therefore, the relationship between solar activity and epidemic may depend on the this phase, which could be caused by both the sun and the Earth. This question requires more long-term investigations and historical data to comprehensively understand the impact of solar activity on the Earth and its biosphere.

This study uses long-term epidemic data from Chinese historical books to analyze the relationship between epidemic and solar activity. The results show that the epidemic index and sunspot number have similar periodic changes; the long-term trend consistency is also apparent in the non-high frequency signal. Of course, the factors affecting epidemics are diverse and complex, and more interdisciplinary research is needed in the future.

This study promotes further studies of long-term changes in the epidemic, and lays a foundation for the future search for the relationship between epidemic and solar activity changes and for the mechanism of long-term changes in epidemic to provide early warning features to humans.

More information:
Si Chen et al, Correlation analysis between the occurrence of epidemic in ancient China and solar activity, Science China Earth Sciences (2022). DOI: 10.1007/s11430-022-9986-5

Provided by Science China Press

Citation: Correlation analysis between the occurrence of epidemic in ancient China and solar activity (2023, April 18) retrieved 30 July 2025 from https://sciencex.com/wire-news/443290455/correlation-analysis-between-the-occurrence-of-epidemic-in-ancie.html
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