Just like with other tools, the more a coronagraph ages, the less reliable it gets. So, next month, NOAA's GOES-U will take to space a brand-new coronagraph which will provide clearer images of the sun's activity.

GOES-U satellite launch this month will bring a solar activity monitor to space

Source: space
Source Link: https://www.space.com/goes-u-launch-coronagraph-space-weather