Discrete Aurora Are Sporadic Ultraviolet Emissions On Mars. These Emissions, Which
Occur Globally And In The Upper Atmosphere Of Mars, Are Strongly Correlated With Martian Crustal
Magnetic Field. Crustal Fields On Mars Form From Remanent Magnetism Locked In The Crust, And
Vary In Strength Across The Disk, With The Strongest Fields Located In The Southern Hemisphere
Discrete Aurora On Mars Was First Identified By The Ultraviolet Spectrograph (Spicam) On
Mars Express (Bertaux Et. Al. 2005) Which Appeared As Clustered, Sporadic, And Localized
Emissions In The Mid-Ultraviolet. Further Work Conducted By The Spicam Team (Leblanc Et Al.,
2006, Leblanc Et Al., 2008, Gerard Et Al., 2015) Expanded The List Of Detections To 19, 16 Of Which
Were Identified In Nadir-Viewing Geometry. This Work Showed That (1) The Lifetime Of Discrete
Aurora Is On The Second Timescale And (2) Correlations Between Detection Time And Electron Energy
Measurements (Taken By The Aspera-3 Instrument Aboard The Mars Express) Showed That
Detection Locations Were Highly Correlated With Locations Of Increased Precipitating Electron
Fluxes (Gerard Et Al., 2015.) These Spicam Detections Were Plotted On Top Of A Global Crustal
Field Map (Brain Et Al., 2007) And Found To Be Correlated With Local Field Strengths. Analysis Of
Precipitating Electron Populations With Contemporaneous Spicam Aurora Detection Times (Brain
Et Al., 2006, Gérard Et Al., 2015, Leblanc Et Al., 2006, Leblanc Et Al., 2008) With Models Of
Electron Energy Deposition And Resultant Emission Altitudes (Leblanc Et Al., 2006, Soret Et Al.,
2016) Revealed The Emission Populations Causing Discrete Aurora And Altitude. These Electron
Populations Are Likely Between 40-200 Ev And Peak Near 130 Km Altitude (Brain Et Al., 2006,
Soret Et. Al. 2021.)