# Round-the-world echo of earthquake and solar flare

## TL;DR

This paper explores the analogy between seismic echoes on Earth and solar flares, suggesting that circular surface waves can trigger aftershocks and flare brightness increases on both celestial bodies.

## Contribution

It introduces the concept of round-the-world surface waves influencing seismic aftershocks and solar flare brightness, highlighting a novel analogy between Earth and Sun phenomena.

## Key findings

- Earthquake main shock excites a circular surface wave causing aftershocks.
- A small increase in solar flare brightness occurs about one hour after maximum.
- Similar circular surface wave effects are observed on Earth and Sun.

## Abstract

We drew attention to the analogy between the round-the-world seismic echo on the Earth and on the Sun. The phenomenon of echo on the Earth is observed during earthquakes. It was found that the main shock of earthquake excites a circular surface wave, which having rounded the Earth returns to the epicenter and stimulates a repeated earthquake (aftershock) 3 hours after the main shock. Apparently, something similar happens on the Sun during a chromospheric flare. We found signs of a small increase in flare brightness approximately one hour after reaching maximum brightness. The phenomenon is explained by the fact that the converging surface wave, which has returned to the epicenter after the round-the-world trip, has a definite impact on the flare area. Keywords: earthquake source, main shock, aftershock, chromospheric flare, circular surface wave

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Source: https://tomesphere.com/paper/1905.10644