Introduction to MARSIS

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Introduction to MARSIS Jeffrey Plaut JPL-Caltech SHARAD/MARSIS Data Users’ Workshop 16 March 2014

Transcript of Introduction to MARSIS

Introduction to MARSIS

Jeffrey Plaut JPL-Caltech

SHARAD/MARSIS Data Users’ Workshop!16 March 2014!

MARSIS Deployed on Mars Express!

10 km!

MARSIS!

Ground Track!

Individual Echoes!

Radargram!Time!(Depth)!

MARSIS Data Collection!

Radar Channels! 1.8, 3.0, 4.0, 5.0 MHz!

(λ =166, 100, 75, 60 m)!+ Ionospheric channel 0.1-1.3 MHz!

MARSIS - North Polar Layered Deposits!

MARSIS - North Polar Layered Deposits!

•  Lower reflector depth = 1.8 km in ice.!

•  Low attenuation requires clean ice (< 2% impurities). !

•  No evidence for basal melt zone.!

•  No detected deflection from load --> large elastic thickness.!

Orbit 9548 – June 2011

200 km

Orbit 9548 – June 2011

200 km

Olympia Undae Rupes Tenuis plateau

Basal unit

NPLD

Orbit 9548 – June 2011

200 km

Time Delay

Orbit 9548 – June 2011

200 km

Depth

2 km

Time Delay

SHARAD 12531_01 + 18451_02

Depth

SHARAD 12531_01 + 18451_02

Depth

MARSIS 9548

Depth

MARSIS 9548

Depth

SHARAD 12531_01 + 18451_02

Depth

SHARAD 12531_01 + 18451_02

Typical MARSIS Ionogram

Single Echo –Example 1

Double Echo –Example 1

Double Echo, Example 2

Explanation of Double Echoes