jeudi 15 mars 2018

NASA Powers on New Instrument Staring at the Sun

ISS - International Space Station logo.

March 15, 2018

NASA has powered on its latest space payload to continue long-term measurements of the Sun's incoming energy. Total and Spectral solar Irradiance Sensor (TSIS-1), installed on the International Space Station, became fully operational with all instruments collecting science data as of this March.

"TSIS-1 extends a long data record that helps us understand the Sun’s influence on Earth’s radiation budget, ozone layer, atmospheric circulation, and ecosystems, and the effects that solar variability has on the Earth system and climate change," said Dong Wu, TSIS-1 project scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland.

Animation above: Shown here: TSIS-1 getting extracted from the trunk of the SpaceX Dragon capsule. Animation Credits: NASA Goddard.

The instrument was launched from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida aboard a SpaceX Falcon 9 rocket on Dec. 15, 2017. After a two-week pause, TSIS-1 was extracted from the trunk of the SpaceX Dragon capsule and integrated onto its permanent home on the space station.

For over two months, the operations team at the University of Colorado Laboratory for Atmospheric and Space Physics (LASP) in Boulder, Colorado have been testing TSIS-1. First, the team tested the all-important pointing platform that directs the solar instruments at the Sun.

Next came testing of the solar instruments. TSIS-1 studies the total amount of light energy emitted by the Sun using the Total Irradiance Monitor, one of two sensors onboard. This sensor's data will give us a better understanding of Earth’s primary energy supply and provide information to help improve models simulating the planet’s climate. The monitor first started collecting science data – called "first light"— on January 11th after its doors were opened to fully view the Sun. The sensor extends a 40-year measurement of the Sun's total energy to Earth.

Image above: Follow NASA's TSIS-1 from its launch to its installation aboard the International Space Station to its collection of science data. Image Credits: NASA Goddard.

The second onboard sensor, called the Spectral Irradiance Monitor, measures how the Sun’s energy is distributed over the ultraviolet, visible and infrared regions of light. Measuring the distribution of the Sun's energy is important because each wavelength of light interacts with Earth's atmosphere differently.

For instance, spectral irradiance measurements of the Sun's ultraviolet radiation are critical to understanding the ozone layer — Earth's natural sunscreen that protects life from harmful radiation. The sensor experienced first light on March 4th when full science data collection began. TSIS-1's Spectral Irradiance Monitor extends a 15-year record of spectral irradiance measurements. 

"All systems are operating within their expected ranges," said Peter Pilewskie, TSIS-1 lead scientist LASP. "A lot of hard work remains for the team to interpret and validate the TSIS-1 data."

Animation above: Shown here: the pointing platform directs the solar instruments at the Sun. Perched on the space station, the instrument operates like a sunflower and follows the Sun from sunrise to its sunset, which occurs every 90 minutes. At sunset, TSIS-1 rewinds, recalibrates and waits for the next sunrise Animation Credits: University of Colorado Laboratory for Atmospheric and Space Physics (LASP).

NASA’s Goddard Space Flight Center has overall responsibility for the development and operation of TSIS-1 on the International Space Station for the next 5 years.  LASP under contract with NASA, is responsible for providing the solar irradiance measurements and providing them to the Goddard Earth Science Data and Information Services Center, the archive and distribution center for TSIS-1 data, so they are available to the scientific community.

For more information on the TSIS-1 mission, visit

Space Station Research and Technology:

International Space Station (ISS):

Image (mentioned), Animations (mentioned), Text, Credits: NASA/Sara Blumberg/Goddard Space Flight Center, by Kasha Patel.


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