Jupiter's innermost radiation belts (IMAGE) Max Planck Institute for Solar System Research Caption While the high-energy oxygen and sulfur ions outside Amalthea's orbit are supplied from the distant magnetosphere as byproducts of Io’s volcanic eruptions, another source must be responsible for the high concentration of high-energy oxygen ions inward of Amalthea, which prevents the transmission of such ions across its orbit. Credit MPS Usage Restrictions for non-commercial use License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.