1st satellite to measure global winds set for launch

The European Space Agency's Aeolus mission aims to improve short-term weather forecasting and understanding of man-made climate change

Agence France-Presse

Published: 3:30 AM August 19, 2018

Updated: 3:59 AM August 19, 2018

SATELLITE LAUNCH. The European Space Agency's Aeolus satellite will map the Earth's wind patterns. Photo courtesy of the ESA Multimedia Gallery

PARIS, France – A satellite designed to measure Earth's global wind patterns is set to be hoisted into orbit on Tuesday, August 21 from the Arianespace launch site in French Guiana. 

The European Space Agency's (ESA) Aeolus mission – named for the guardian of wind in Greek mythology – promises to improve short-term weather forecasting and our understanding of man-made climate change. (READ: Russia launches European satellite to monitor Earth's atmosphere)

"Meteorologists urgently need reliable wind-profile data to improve accuracy," the ESA said in a statement.

Tropical winds in particular are very poorly mapped because of the almost complete absence of direct observations 

Once in orbit, Aeolus can retrieve data from anywhere on the planet, include remote regions lacking ground-based weather stations.

The satellite will carry a large telescope measuring 1.5 meters (across, an ultra-sensitive receiver, and a Doppler wind lidar nicknamed Aladin.  

The Doppler lidar transmits short, powerful pulses of laser light toward Earth in the ultraviolet spectrum. Particles in the air – moisture, dust, gases – scatter a small fraction of that light energy back to the transceiver, where it is collected and recorded. 

The delay between the outgoing pulse and the so-called "backscattered" signal reveals the wind's direction, speed, and distance travelled. 

Once per orbit, data is downloaded to a ground station in Svalbard, Norway.

The 1,260-kilogram payload will be hoisted into a 320-kilometer orbit on a Vega rocket, with lift-off scheduled for Tuesday at 21:00 GMT. 

Aeolus will be the 5th of the ESA's planned Earth Explorer missions. Others already completed or in operation have measured Earth's gravity and geomagnetic fields, soil moisture, ocean salinity and frozen expanses collectively known as the cryosphere. (READ: First lake of liquid water is dicovered on Mars)

The new mission will be Arianespace's 50th launch for the ESA. – Rappler.com