Scientists have learned how discrete aurora is formed on
In a new study, the physicists studied discrete aurora, a light-in-the-sky phenomenon that occurs predominantly during the night in the red planet’s southern hemisphere. While scientists have known about discrete aurora on Mars–which also occur on Earth—they were mystified as to how they formed. That’s because Mars does not have a global magnetic field like Earth, which is a main trigger for aurora, also called the northern and southern lights on our planet.
Instead, the physicists report, discrete aurora on Mars are governed by the interaction between the solar wind—the constant jet of charged particles from the sun—and magnetic fields generated by the crust at southern latitudes on Mars. It’s the nature of this localized interaction between the solar wind and the crustal magnetic fields that leads to discrete aurora, the scientists discovered.
“We have the first detailed study looking at how solar wind conditions affect aurora on Mars,” says Zachary Girazian, an associate research scientist in the Department of Physics and Astronomy and the study’s corresponding author. “Our main finding is that inside the strong crustal field region, the aurora occurrence rate depends mostly on the orientation of the solar wind magnetic field, while outside the strong crustal field region, the occurrence rate depends mostly on the solar wind dynamic pressure.”
The findings come from more than 200 observations of discrete aurora on Mars by the
Contributing authors are Nick Schneider, Zachariah Milby, Xiaohua Fang, Sonal Kumar Jain, and Justin Deighan from the University of Colorado-Boulder; Tristan Weber from NASA Goddard Space Flight Center; Jean-Claude Gerard and Lucas Soret from the Universite de Liege in Belgium; and Christina Lee from the University of California-Berkeley.
NASA funded the research.