By Paul Rincon Science editor, BBC News website - Our planet is being bombarded by high-energy particles unleashed by the strongest solar storm since 2005, scientists say. The charged particles are mostly a concern for satellites - which they can disrupt - and astronauts. But they can also cause communication problems for aircraft travelling near the poles. The geomagnetic storm has been caused by a potent flare that erupted from the Sun at 0400 GMT on Monday. The effects are likely to be felt on Earth throughout Wednesday. A more benign effect of the outpouring of particles is the ability to see aurorae, or "Northern lights", farther south than is usually possible.