Scientists have revealed new evidence of space wind, confirming a theory proposed 20 years ago. ‘Plasmaspheric wind’ is an elusive phenomenon and its existence helps scientists understand how the atmosphere protects us from violent solar winds.
Proof of space wind was uncovered in a study in European Geosciences Union journal Annales Geophysicae. The so-called ‘plasmaspheric wind’ is actually created by the Earth. Essentially, an imbalance between centrifugal and pressure forces and gravitational pull causes the steady flow of ionized particles from inside the atmosphere to the magnetosphere.
The magnetosphere is the region of space surrounding the earth that is governed by the planet’s magnetic field.
“After long scrutiny of the data, there it was, a slow but steady wind, releasing about 1 kg of plasma every second into the outer magnetosphere: this corresponds to almost 90 tons every day,” said Dr Iannis Dandouras, author of the study. He added the discovery was “one of the nicest surprises I’ve ever had.”
From the data, Dandourus calculated that the winds carry plasma (superheated gas) a day from the lower atmosphere into the magnetosphere at speeds of some 5,000 kilometers per hour.
Dandourus collated data from the EU Space Agency’s Cluster mission which was launched back in 2000. The Cluster mission is made up of four satellites that monitor the relationship between the Earth’s magnetosphere and solar winds.
The study will help scientists increase their understanding of how different layers of the Earth’s atmosphere interact with each other and protect the planet from solar winds. Furthermore, the findings indicate that other planets and celestial bodies that have similar atmospheres and rotations should also generate ‘plasmasphereic wind.’