The light of the corona is usually only visible on Earth during a total eclipse. It can be seen with specialist equipment though. Like a space telescope. Credit: Luc Viatour
The Sun’s corona, this aura of plasma that surrounds the main star, is many hundreds of times hotter than the photosphere, the surface that we see. While the temperature of the Sun’s surface is only 6,000K the corona can reach up to 1,000,000K.
Simulation of a cross section of a thread of solar material. All hail hypnothread. ALL HAIL. Credits: NAOJ/Patrick Antolin
No one is 100% sure why this is, though the current leading theory is that it’s probably magnets… or rather that magnetic waves generated by the motions of matter inside the star. These oscillate through the Sun and cause the plasma in the corona to move in a turbulent motion (queue mesmerising gif to left) and the friction heats up the corona.
The Square Kilometer Array (SKA), a radio telescope being built in both Australia and South Africa and expected to actually cover 5 square kilometres of ground, will produce enough raw data to fill 15 million 64GB iPods a day. That’s equivalent to every piece of information sent and received over the entire internet. Twice.
An artists impression of what the SKA antenna will look like. Thousands of these 12m diameter dishes, split between the two sites, will cover the square kilometre.
But it’s alright. You don’t have to rush out and panic buy iPods. Most of that information doesn’t tell us anything and gets thrown out straight away. Working out what to lose and what to keep, however, is one of the most challenging aspects of any project as big as the SKA.