NASA's Solar Dynamics Observatory reveals large 'coronal hole' on sun's surface
Coronal holes are magnetically open areas that are one source of high-speed solar wind.
Oct 15, 2015, 09:22 AM IST
Coronal hole
Coronal holes are magnetically open areas that are one source of high-speed solar wind.
Oct 15, 2015, 09:22 AM IST