Picture of the Week
As the Dark Energy Survey begins its second year of observations, UCL scientists are at the forefront of its science programme. This week's 'Picture of the Week' is galaxy NGC 1398, snapped during the survey's observations.
24 February 2014
This image shows the Sun in far ultraviolet light, as seen from the Solar Dynamics Observatory, a NASA spacecraft. These wavelengths cannot be observed from the surface of the Earth, as the high-energy short wavelength radiation is absorbed by the atmosphere.
The image shows an ongoing solar storm (or 'coronal mass ejection') which took place on 7 June 2011. Some of the material ejected from the Sun's surface is visible as dark fingers of material on the right hand side of the disc.
Scientists at UCL's Mullard Space Science Laboratory have used these images of the 7 June 2011 solar storm to study how solar material behaves as it falls back onto the surface of the Sun. And they have found that the Sun has an unexpected twin some 6500 light years away: the Crab Nebula.
The Crab Nebula is a cloud of gas and dust left after the explosion of a large star, almost 1000 years ago. But the structures formed by the gas there are much the same as those visible during solar storms.
Image credit: NASA Solar Dynamics Observatory
- More information on the UCL study of the 7 June 2011 solar storm
- UCL Mullard Space Science Laboratory
- NASA Solar Dynamics Observatory
High resolution image
This image can be reproduced freely providing the source is credited
Page last modified on 24 feb 14 14:11