It has been 21 years since Sweden last launched a research satellite into space.
Now the next one is coming and its tasks are very similar to what previous Swedish research satellites focused on, namely research on the Earth's atmosphere.
The waves in the atmosphere exist at different scales and are mostly invisible.
But the "atmospheric gravity waves" give rise to global patterns that tie together the atmospheres on opposite sides of the globe.
Images and measurements from Mars should provide a 3D picture of the atmospheric waves.
It is expected to help the researchers to better models of climate, weather and space weather.
The atmospheric waves can be formed by disturbances coming from warm or cold fronts, thunderstorms or mountains.
Mats is as big as a dishwasher, weighs about 50 kilos on the ground, and will circle the earth at an altitude of 600 kilometers.
By comparison, the International Space Station is in orbit about 400 kilometers up.
The launch takes place with a rocket from New Zealand.
Sweden's previous research satellite, Odin, was sent up from Svobodnyj in Russia in February 2001. Odin's planned lifespan was two years, so now it has been working overtime for 19 years and has contributed knowledge about how climate and average temperature on Earth are affected and changed.
Odin is mostly Swedish but also an international collaboration, which includes parts from Canada, Finland and France.