radiometer

And a radiometer will sense how much of the energy falling on to Earth from the Sun is being reflected or radiated back into space.

Instead, they have tapped into data from GPS satellite radiometers, capturing the sunlight bouncing off the Arctic.

Juno is also equipped with a tool called a “microwave radiometer.”

Mission managers intend to use microwave radiometers to see through clouds and measure the temperature and moisture of tropical storms.

The instrument, a mini microwave radiometer, can measure heat and light emanating from oxygen and water vapor in the air.