Figure 1 (IMAGE) Tohoku University Caption Altitude profiles of the collision rate per electron for the cases of the precipitation of 1, 4, 10, 40, 100, 400, and 1000 keV electrons whose initial pitch angle is 70 degrees at an altitude of 400 km (thick solid lines). Credit Yuto Katoh et al. Usage Restrictions Reporters may use freely these materials in news coverage with appropriate credit information. 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.