Mars Advanced Radar for Subsurface and Ionosphere Sounding

E405589

planetary radar instrument scientific instrument spaceborne radar sounder

Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) is a radar instrument designed to probe beneath the Martian surface and study its ionosphere by transmitting low-frequency radio waves from orbit.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (2)

Label	Occurrences
MARSIS	2
Mars Advanced Radar for Subsurface and Ionosphere Sounding canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T4017991 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Mars Advanced Radar for Subsurface and Ionosphere Sounding
Context triple: [Mars Express, carriesInstrument, Mars Advanced Radar for Subsurface and Ionosphere Sounding]

A. Mars Environmental Dynamics Analyzer
The Mars Environmental Dynamics Analyzer is a suite of weather instruments aboard NASA's Perseverance rover that measures atmospheric conditions and dust on the Martian surface.
B. Mars Exospheric Neutral Composition Analyser
The Mars Exospheric Neutral Composition Analyser is a scientific instrument designed to study the composition and structure of Mars’ upper atmosphere and exosphere.
C. InSight Mars lander
The InSight Mars lander was a NASA robotic mission designed to study the interior structure and seismic activity of Mars to better understand the formation and evolution of rocky planets.
D. Methane Sensor for Mars
Methane Sensor for Mars is a scientific instrument aboard India’s Mars Orbiter Mission designed to detect and measure methane in the Martian atmosphere.
E. Moon Mineralogy Mapper
Moon Mineralogy Mapper is a NASA-designed imaging spectrometer that mapped the Moon’s surface composition in detail, notably helping confirm the presence of water and hydroxyl on the lunar surface.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Mars Advanced Radar for Subsurface and Ionosphere Sounding
Target entity description: Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) is a radar instrument designed to probe beneath the Martian surface and study its ionosphere by transmitting low-frequency radio waves from orbit.

A. Mars Environmental Dynamics Analyzer
The Mars Environmental Dynamics Analyzer is a suite of weather instruments aboard NASA's Perseverance rover that measures atmospheric conditions and dust on the Martian surface.
B. Mars Exospheric Neutral Composition Analyser
The Mars Exospheric Neutral Composition Analyser is a scientific instrument designed to study the composition and structure of Mars’ upper atmosphere and exosphere.
C. InSight Mars lander
The InSight Mars lander was a NASA robotic mission designed to study the interior structure and seismic activity of Mars to better understand the formation and evolution of rocky planets.
D. Methane Sensor for Mars
Methane Sensor for Mars is a scientific instrument aboard India’s Mars Orbiter Mission designed to detect and measure methane in the Martian atmosphere.
E. Moon Mineralogy Mapper
Moon Mineralogy Mapper is a NASA-designed imaging spectrometer that mapped the Moon’s surface composition in detail, notably helping confirm the presence of water and hydroxyl on the lunar surface.
F. None of above. chosen

Statements (44)

Predicate	Object
instanceOf	planetary radar instrument ⓘ scientific instrument ⓘ spaceborne radar sounder ⓘ
carriedBy	Mars Express ⓘ
dataType	ionograms ⓘ radar echoes ⓘ
designedTo	probe beneath the Martian surface ⓘ study the Martian ionosphere ⓘ
employsTechnique	radar sounding ⓘ radio echo sounding ⓘ
environmentStudied	Martian ionosphere ⓘ Martian subsurface ⓘ
frequencyBand	HF/VHF ⓘ
hostAgency	European Space Agency ⓘ
location	onboard Mars Express orbiter ⓘ
measurementType	dielectric properties of Martian subsurface ⓘ ionospheric electron density ⓘ subsurface structure ⓘ
missionContext	Mars Express ⓘ surface form: Mars Express mission
observes	ionospheric reflections at Mars ⓘ subsurface interfaces on Mars ⓘ
operatesOn	Mars ⓘ
operator	European Space Agency ⓘ
orbitsIn	Mars orbit ⓘ
platformType	orbiter instrument ⓘ
primaryFunction	ionosphere sounding ⓘ subsurface sounding ⓘ
purpose	characterize ionospheric conditions affecting radio wave propagation at Mars ⓘ investigate the presence of liquid water beneath the Martian surface ⓘ map subsurface layering on Mars ⓘ
scientificDiscipline	planetary geophysics ⓘ planetary science ⓘ space plasma physics ⓘ
scientificGoal	characterize the Martian ionosphere ⓘ detect subsurface water and ice on Mars ⓘ
shortName	Mars Advanced Radar for Subsurface and Ionosphere Sounding self-linksurface differs ⓘ surface form: MARSIS
spacecraft	Mars Express ⓘ
studies	distribution of subsurface ice on Mars ⓘ structure of the Martian crust ⓘ variability of the Martian ionosphere ⓘ
targetBody	Mars ⓘ
uses	low-frequency radio waves ⓘ
waveProperty	low frequency ⓘ
waveType	radio waves ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Mars Express → carriesInstrument → Mars Advanced Radar for Subsurface and Ionosphere Sounding ⓘ

this entity surface form: MARSIS

Mars Advanced Radar for Subsurface and Ionosphere Sounding → shortName → Mars Advanced Radar for Subsurface and Ionosphere Sounding self-linksurface differs ⓘ