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

What Happened to the Ancient Martian Atmosphere?

Dave BrainUniversity of Colorado Boulder

29 July, 2015Western Alliance Conference

The Martian Atmosphere Today

Cold ThinToxic

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Two Mysteries in One

https://www.youtube.com/watch?v=zm3b3kwzSF4&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

MarsAtmosphere andVolatileEvolutioN

Neutrals and Ions Plus Evolution

IUVS NGIMSIon-Related Properties and Processes

LPWMAGSTATIC

Sun, Solar Wind, Solar Storms

SWIAEUV

SWEASEP

The MAVEN Science Instruments:

IUVS Observations of Atomic Components of H2O and CO2 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 CSSRed = after