Visualizing Whistlers (IMAGE) American Physical Society Caption Chirping of the plasma whistler-mode waves are visualized with the help of wave intensity plotted over time (horizontal axis). The high-intensity signals (red streaks) occur at increasing frequency (vertical axis) as time progresses in observations from both the LAPD experiment and the THEMIS satellite cluster that orbits the Earth. Credit Jacob Bortnik Usage Restrictions None 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.