LASP-led CubeSat will study Earth’s inner radiation belt

Xinlin Li with CubeSat

LASP space physics scientist Xinlin Li holds up a model of the CSSWE cube satellite that studied energetic particles in Earth’s magnetosphere. The new CIRBE CubeSat will build on the success of the CSSWE project. (Courtesy LASP)

A NASA-funded CubeSat, to be built and operated at LASP, will study the inner radiation belt of Earth’s magnetosphere, providing new insight into the energetic particles that can disrupt satellites and threaten spacewalking astronauts.

The $4 million Cubesat: Inner Radiation Belt Experiment (CIRBE) mission, tentatively slated for a 2021 launch, will provide some of the first advanced resolution of one of Earth’s two Van Allen belts, a zone that traps energetic particles in the planet’s magnetic field. This powerful radiation, known to physicists since the late 1950s, poses a hazard to solar panels, electronic circuitry, and other hardware onboard spacecraft traveling at and beyond low-Earth orbit.

“CIRBE will provide sophisticated, fine-grain measurements of this Van Allen belt like never before,” said principal investigator Xinlin Li of LASP and the Ann and H.J. Smead Department of Aerospace Engineering Sciences (AES) at CU Boulder. “We will study the distribution of these particles and how they become so energized.”

CubeSats are breadbox-sized satellites that can be built economically in order to achieve specific scientific objectives. CU Boulder students (including undergraduates) have worked on several successful CubeSat missions in recent years, and the campus currently has more than eight such projects in operation or in development across its various departments and research institutes.

“CU Boulder is clearly recognized as a world leader in cube satellite technology,” said Professor Scott Palo of AES, a co-investigator on the project. “We’ve seen tremendous growth over the past five or six years. Industry partners and science organizations see a huge value in these small satellites.”

CIRBE is poised to build on the success of the Colorado Student Space Weather Experiment (CSSWE), a CubeSat that launched in 2012 to study the Van Allen belt and operated for over two years. CSSWE data resulted in more than 21 peer-reviewed publications in major scientific journals, including Nature. The mission also helped solve a longstanding astronomical mystery regarding the source of some energetic and potentially damaging particles in Earth’s radiation belts.

In the years since CSSWE’s launch, researchers have further improved a ground station, which is located on the roof of the LASP building on CU Boulder’s campus and was built by CU Boulder students. By the time CIRBE launches, the station will be able to collect data 100 times faster than before.

The CIRBE mission will include collaborations with Colorado’s aerospace industry, including Boulder-based Blue Canyon Technologies, which will manufacture the CubeSat bus. The overall system design, science instrument development, integration, test, mission operation, data analysis, and modeling will be done at CU by LASP and AES faculty, engineers and graduate students. The project also features a partnership with the Air Force Research Laboratory and NASA’s Goddard Space Flight Center.

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