Excitement is building over European plans to launch a new space-weather satellite that would drastically improve forecasts of how solar storms will affect Earth.
The European Space Agency (ESA) hopes to send the probe to a gravitationally stable point in space known as Lagrange point 5 (L5) by around 2023, where it would provide a unique, side-on view of streams of charged particles heading towards Earth. The strongest of such eruptions, known as coronal mass ejections (CMEs), can knock out navigation and communications satellites, interfere with aeroplane navigation systems and disrupt power grids.
Currently, probes can only look at incoming space weather head-on. The side-on view would allow scientists to measure the speed of the bursts with greater accuracy. And by observing the Sun’s surface as it rotates towards Earth, the probe would give a preview of sunspots, some of which produce CMEs, before they directly face Earth … (Nature)