Jupiter's Powerful Lightning Revealed by Juno

Jupiter, the solar system's most massive planet, experiences immense storms that can last for centuries and generate powerful lightning. A new study by University of California, Berkeley scientists, published March 20 in AGU Advances, sheds light on the incredible power of these Jovian flashes.

The study indicates some of these flashes are up to 100 times more powerful than lightning on Earth, with a possibility of being significantly stronger.

Data and Methodology

The findings result from an analysis of data from NASA's Juno spacecraft, which has been orbiting Jupiter since 2016. Juno's microwave radiometer detected radio emissions from lightning, similar to radio interference caused by lightning on Earth.

Studying storms on Jupiter provides crucial insights into atmospheric processes and convection—the mechanism by which heat is transported in atmospheres. Jupiter's hydrogen-dominated atmosphere influences convection differently than Earth's nitrogen-based atmosphere. On Jupiter, moist air is heavier and requires more energy to rise.

This leads to a higher energy release when storms reach the upper atmosphere, resulting in high wind speeds and intense, cloud-to-cloud lightning.

Previous missions often detected Jupiter's lightning via night-side flashes, which could be obscured by clouds. Juno's microwave radiometer offered a more precise method, unaffected by cloud cover. Initially, identifying the specific source of lightning was challenging due to simultaneous storms across the planet's belts.

Isolated Storm Analysis

In 2021 and 2022, a period of reduced storm activity in Jupiter's North Equatorial Belt allowed researchers to focus on individual large storms. These periods provided clearer data for pinpointing the origin and intensity of the lightning.