What Happened to the Ancient Martian Atmosphere? Dave Brain University of Colorado Boulder 29 July, 2015 Western Alliance Conference.

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Presentation transcript:

What Happened to the Ancient Martian Atmosphere? Dave Brain University of Colorado Boulder 29 July, 2015 Western Alliance Conference

The Martian Atmosphere Today Cold ThinToxic ++

Two Mysteries in One wzSF4&feature=youtu.be

Up Down Where Did the Atmosphere Go?

What Causes the ‘Ups’? Photons Solar Wind Magnetic Field Solar Energetic Particles

Drivers, Reservoirs, and Escape

Mars Atmosphere and Volatile Evolutio N

Neutrals and Ions Plus Evolution IUVS NGIMS Ion-Related Properties and Processes LPW MAGSTATIC Sun, Solar Wind, Solar Storms SWIAEUV SWEA SEP The MAVEN Science Instruments:

IUVS Observations of Atomic Components of H 2 O and CO 2 on Their Way to Escaping

Expected Escape Pattern

Escaping Oxygen Ions

Close Encounter With Comet Siding Spring Breckland Skies Observatory A comet passed close to Mars on October 19, 2014

A Martian Meteor Shower Blue = before CSS Red = after

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