Radio emissions from Jupiter
Why in News?
Radio emissions from Jupiter are in the news because of a major milestone: April 5–6, 2026, marked the 71st anniversary of the planet’s "voice" being discovered. Additionally, new research from NASA’s Juno mission has used these radio signals to redefine the planet's physical size and analyse its "super-powered" lightning.
About
- Discovery Anniversary: In April 1955, astronomers Bernard Burke and Kenneth Franklin announced they had detected radio noise from Jupiter—the first time a "voice" was identified from another planet.
- Redefining Jupiter's Shape: In February 2026, data from NASA’s Juno mission used radio occultation to reveal that Jupiter is slightly narrower at the equator and flatter at the poles than previously thought.
- Super-Lightning Discovery: A study published in April 2026 used radio pulses to detect lightning on Jupiter that is 100 times more powerful than Earth’s, revealing a much more violent atmosphere than anticipated.
- Juno Mission Budget: The mission is currently a topic of debate in the U.S. Congress, with proposals to either end it in 2025 or extend it through 2026 to study Jupiter's rings and inner moons.
Key Information
- Decametric Radiation (DAM): These are intense bursts of radio noise at long wavelengths (tens of metres). They were the first evidence of Jupiter's powerful magnetic field.
- Decimetric Radiation (DIM): A steady, continuous radio emission at shorter wavelengths (tenths of a metre). It is caused by synchrotron radiation from high-energy electrons trapped in the planet’s radiation belts.
- The "Io Connection": Jupiter's volcanic moon, Io, acts as a massive electric generator. As it moves through Jupiter’s magnetic field, it creates a 5-million-ampere current, "energising" certain radio bursts.
- Auroral "Voice": Much of the radio emission is generated by charged particles spiralling into Jupiter’s poles, creating massive permanent auroras that are the most powerful in the solar system.
Scientific & Practical Uses
- Spacecraft Navigation: Radio signals are used as a "calibration standard" for modeling giant planets in other star systems.
- Internal Mapping: By "seeing" through Jupiter’s thick clouds with radio waves, scientists can measure the planet's temperature, pressure, and electron density.
- Icy Moon Exploration: Future missions like ESA’s Juice and NASA’s Europa Clipper plan to use Jupiter's own radio emissions as a "passive radar" to peek through the ice shells of moons like Europa and Ganymede.
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