Mars' upper atmosphere may be indeed closer to Earth's than previously thought. Researchers showed that the upper atmosphere of Mars glows blue depending on the activity of the Sun. The result was achieved through numerical simulation and a laboratory experiment, called the Planeterrella, used to simulate the aurora.'The study indicates that the strongest colour in the Martian aurorae is deep blue. Green and red also occur, just like on Earth. An astronaut looking up while walking on the red Martian soil would be able, after intense solar eruptions, to see the phenomena with the naked eye'.
For more details:omicsgroup.org/journals/geophysics-remote-sensing.php