A solar instrument package designed and built by CU Boulder and considered a key tool to help monitor the planet鈥檚 climate has arrived at NASA鈥檚 Kennedy Space Center in Florida for a targeted November launch.
The instrument suite is called the Total and Spectral Solar Irradiance Sensor (TSIS-1) and was designed and built by CU Boulder's for NASA鈥檚 Goddard Space Flight Center in Greenbelt, Maryland. The contract value to LASP is $90 million and includes the instrument suite and an associated mission ground system.
TSIS-1 will launch on a commercial SpaceX Falcon 9 rocket in a Dragon capsule for delivery to the International Space Station (ISS). From there it will monitor the total amount of sunlight hitting Earth, as well as how the light is distributed among the ultraviolet, visible and infrared wavelengths.
鈥淲e need to measure both because both affect Earth鈥檚 climate,鈥� said Dong Wu, the TSIS-1 project scientist at NASA Goddard.
CU Boulder Professor Peter Pilewskie of LASP, lead mission scientist on the project, said TSIS will continue a 39-year record of measuring total solar radiation, the longest continuous climate record from space.
鈥淭hese measurements are vital for understanding the climate system because the sun is the source of virtually all of Earth鈥檚 energy,鈥� said Pilewskie, also a baby直播app member in the . 鈥淗ow the atmosphere responds to subtle changes in the sun鈥檚 output helps us distinguish between natural and human influences on climate.鈥� 听
Overall satellite measurements of the sun from space have shown that changes in its radiation over time 鈥� during periods of both high and low solar activity 鈥� is only about 0.1 percent. While scientists believe changes in solar output cannot explain Earth鈥檚 recent warming, a longer dataset could reveal greater swings in solar radiation.
TSIS consists of two instruments, including the Total Irradiance Monitor (TIM), which measures the total light coming from the sun at all wavelengths, said Pilewskie. The second LASP instrument, the Spectral Irradiance Monitor (SIM), will measure how the light from the sun is distributed by wavelength and absorbed by different parts of the planet鈥檚 atmosphere and surface.
One reason the SIM instrument is important is because measurements of the sun鈥檚 UV radiation are critical to understanding the condition of Earth鈥檚 protective ozone layer.
The TSIS instrument suite will be operated remotely from the LASP Space Technology Building at CU Boulder's Research Park.
The project involved about 30 scientists and engineers at LASP during its peak, as well as 10 additional support personnel from baby直播app and about 10 more from outside of baby直播app, said TSIS-1 Project Manager Brian Boyle of LASP. The mission, slated to run at least five years, also has involved about 15 to 20 CU Boulder undergraduate and graduate students to date.
LASP has made solar radiation measurements from orbit on seven missions since 1975, including the $100 million satellite designed, built and controlled from campus.听
