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Physicists Explain Mysterious “Discrete Aurora” on Mars

Researchers led by the University of Iowa have learned how a type of aurora on Mars is formed. In a new study, the physicists report discrete aurora form through the interaction of the solar wind and the crust at Mars’ southern hemisphere. Credit: CU/LASP

Scientists have learned how discrete aurora is formed on MarsMars is the second smallest planet in our solar system and the fourth planet from the sun. Iron oxide is prevalent in Mars' surface resulting in its reddish color and its nickname "The Red Planet." Mars' name comes from the Roman god of war.” data-gt-translate-attributes=”[{“attribute”:”data-cmtooltip”, “format”:”html”}]”>Mars. In a new study, the physicists report that the upstream solar wind properties interacting with the crustal magnetic fields found in Mars’ southern hemisphere strongly affect the formation and properties of the Martian discrete aurora. The research was led by Zachary Girazian, an associate research scientist in the University of IowaThe University of Iowa is a public research university in Iowa City, Iowa that is often abbreviated a U of I, UI, UIowa, or Iowa. It was founded on February 25, 1847, just 59 days after Iowa was admitted to the Union, making it the oldest university in the state. It is organized into 11 colleges offering more than 200 areas of study and seven professional degrees.” data-gt-translate-attributes=”[{“attribute”:”data-cmtooltip”, “format”:”html”}]”>University of Iowa Department of Physics and Astronomy.

Physicists led by the University of Iowa have learned how a type of aurora on Mars is formed.

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.”


Maven Spacecraft Orbiting Mars

This is an artist rendition of NASA”s Mars Atmosphere and Volatile Evolution, or MAVEN spacecraft orbiting Mars. Credit: NASA/GSFC

The findings come from more than 200 observations of discrete aurora on Mars by the NASAEstablished in 1958, the National Aeronautics and Space Administration (NASA) is an independent agency of the United States Federal Government that succeeded the National Advisory Committee for Aeronautics (NACA). It is responsible for the civilian space program, as well as aeronautics and aerospace research. It's vision is "To discover and expand knowledge for the benefit of humanity."” data-gt-translate-attributes=”[{“attribute”:”data-cmtooltip”, “format”:”html”}]”>NASA-led Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. One of the instruments used to make the observations, the Solar Wind Ion Analyzer, is led by Jasper Halekas, associate professor in the Department of Physics and Astronomy and a co-author of the study.

“Now is a very fruitful and exciting time for researching aurora at Mars. The database of discrete aurora observations we have from MAVEN is the first of its kind, allowing us to understand basic features of the aurora for the first time,” Girazian says.

Reference: “Discrete Aurora at Mars: Dependence on Upstream Solar Wind Conditions” by Z. Girazian, N. M. Schneider, Z. Milby, X. Fang, J. Halekas, T. Weber, S. K. Jain, J.-C. Gérard, L. Soret, J. Deighan and C. O. Lee, 27 March 2022, JGR: Space Physics.
DOI: 10.1029/2021JA030238

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.

Source: SciTechDaily