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climate scientists have an enormous

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challenge which is to understand how or

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why climate varies working on Tim and

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the glory mission as yet another

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dimension to that which is understanding

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how the Sun changes and how that affects

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climate total solar irradiance is

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actually a term that scientists have

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begun to use only really in the last 20

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years before that it was called the

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solar constant so the solar constant is

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the integral of all of the energy

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radiated by the Sun at all wavelengths

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we soon learned that actually this solar

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constant varies so therefore we can't

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call it the solar constant anymore so we

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call it the total solar irradiance which

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is really a fancy name for the sun's

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brightness

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scientists have wondered for hundreds of

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years how the sun's radiation changed

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there was a series of ground-based

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measurements and they couldn't determine

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if the changes that they were see were

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from the Sun itself or from the

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it's important to make measurements of

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the solid radiance from space because

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it's the only way with a measure the

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variability the total irradiance monitor

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on glory is at its most basic a

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radiometer it looks at the Sun as of

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start and measures all that incoming

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energy the total irradiance monitor on

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glory is state-of-the-art instrument it

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has unsurpassed accuracy so that means

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we're moving into a new generation of

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solar radius measurements with this

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higher accuracy and precision we have

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recognized that we need to know and

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monitor the forces of climate change

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over a long period the team measurement

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is crucial in continuing this record of

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the sun's radiation that we now have

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covering almost three solar cycles so

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now in a period of what's proving to be

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quite a prolonged solar minimum period

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the solar minimum period is very

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important to measure accurately because

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one of the big questions for climate

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change is what happens in episodes of

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prolonged solar minima the total

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irradiance monitor on glory will be

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launched at a time to capture this very

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uniquely long and low minimum so we're

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very excited about what the measurements