ACI Sounding Rocket (IMAGE) Southwest Research Institute Caption Two NASA sounding rockets carrying SwRI-developed ion instruments studied the electrodynamics of the polar cusp. The instruments will fly on TRACERS, a heliophysics mission to study how the Earth's and Sun's magnetic fields interact, set to launch in 2023. Credit NASA/Jamie Adkins Usage Restrictions Images/videos may be used by the media and the public for educational and informational purposes only License Licensed 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.