Generation of lightning in Jupiter's water cloud

Area of Science:

• Planetary Science
• Atmospheric Science
• Plasma Physics

Background:

• Lightning is observed on Earth and inferred on other planets, including Jupiter.
• Jovian lightning may drive atmospheric chemical reactions, influencing molecular abundances.
• The mechanism for lightning generation in Jupiter's water clouds is similar to Earth's thunderstorms.

Purpose of the Study:

• To model the development of lightning in Jupiter's atmosphere.
• To investigate electrical charge separation in precipitating ice particles within Jovian water clouds.
• To determine the conditions necessary for lightning generation on Jupiter.

Main Methods:

• Atmospheric modeling of electrical charge separation.
• Simulation of precipitating ice particles at various atmospheric depths.
• Analysis of lightning generation mechanisms in Jovian water clouds.

Main Results:

• Lightning can be generated in Jupiter's water clouds.
• Lightning is most likely to occur at the 3- to 4-bar pressure level.
• A condensed-water abundance of at least 1-2 g m-3 is required for Jovian lightning.

Conclusions:

• The study confirms the possibility of lightning in Jovian water clouds.
• The findings align with previous estimates from Voyager image analysis.
• The predicted water abundance offers a testable hypothesis for the Galileo probe mission.