The remote sensing mast with MEDA wind sensors in the clean room.
MEDA is Ready, Weather or Not: The Mars Environmental Dynamics Analyzer (MEDA) collects atmospheric measurements that will provide a regular weather report from Jezero Crater on Mars. Credit: NASA/JPL-Caltech. Full image and caption ›


The Mars Environmental Dynamics Analyzer is known as MEDA. It makes weather measurements including wind speed and direction, temperature and humidity, and also measures the amount and size of dust particles in the Martian atmosphere.

Tech Specs

Main Job To measure weather and monitor dust with sensors from the surface of Mars
Location Sensors are located on the rover's mast "neck" and on the deck, front and interior of the rover's body
Mass Approximately 12 pounds (5.5 kilograms) for all components
Power Up to 17 watts, depending on scheduled measurements

Air temperature sensors:
Each of five sensors is 2.25 by 1 by 2.7 inches
(5.75 by 2.75 by 6.75 centimeters)

Radiation and dust sensor:
5.2 by 4.5 by 5 inches
(13.2 by 11.5 by 12.5 centimeters)

Relative humidity sensor:
24 by 4.4 inches
(5.5 by 2.5 by 7.25 centimeters)

Thermal infrared sensor:
2.5 by 2.25 by 2.25 inches
(6.25 by 5.75 by 5.75 centimeters)

Wind sensors:
Wind Sensor 1 is 2 inches by 6.7 inches (5 by 17 centimeters)
Wind Sensor 2 is 2 by 15.75 inches (5 by 40 centimeters)

Instrument control unit and pressure sensor:
5.5 by 5.5 by 5.1 inches
(14 by 14 by 13 centimeters)

Data Return Approximately 11 megabytes
"MEDA will help prepare for human exploration by providing daily weather report and information on the radiation and wind patterns on Mars."
- Jose A. Rodriguez Manfredi, Principal Investigator

5 Things to Know


MEDA Studies the Dusty Environment
Dust rules on Mars. It drives chemical processes on the surface and in the atmosphere. It affects temperature and weather.


MEDA Helps Predict Weather
MEDA helps astronauts know what weather conditions they'll face on Mars. Their safety depends on accurate weather predictions.


MEDA Measures Radiation
Radiation from the sun and space can alter traces of any past life in Mars rocks. MEDA helps scientists understand these changes and tells them what to look for.


MEDA Measures Water Vapor
MEDA's humidity sensor tells how water vapor is exchanged between the "soil" and atmosphere on Mars.


MEDA Shows Weather's Impact
MEDA shows how dust and weather affect the performance of NASA's Mars 2020 rover, including its cameras and MOXIE's oxygen-making system.