The new mission, called the Sun Radio Interferometer Space Experiment (SunRISE), is an array of six CubeSats operating as one very large radio telescope. NASA has awarded US$62.6 million ($101.5 million) to design, build and launch SunRISE by no earlier than 1 July 2023.
NASA chose SunRISE in August 2017 as one of two mission of opportunity proposals to conduct an 11-month mission concept study. In February 2019, the agency approved a continued formulation study of the mission for an additional year.
SunRISE is led by Justin Kasper at the University of Michigan in Ann Arbor and managed by NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California.
Nicky Fox, director of NASA's Heliophysics Division, said, “We are so pleased to add a new mission to our fleet of spacecraft that help us better understand the sun, as well as how our star influences the space environment between planets.”
The mission design relies on six solar-powered CubeSats – each about the size of a toaster oven – to simultaneously observe radio images of low-frequency emissions from solar activity and share them via NASA’s Deep Space Network.
The constellation of CubeSats would fly within six miles of each other, above Earth's atmosphere, which otherwise blocks the radio signals SunRISE will observe.
Together, the six CubeSats will create 3D maps to pinpoint where giant particle bursts originate on the sun and how they evolve as they expand outward into space.
This, in turn, will help determine what initiates and accelerates these giant jets of radiation.
“The more we know about how the sun erupts with space weather events, the more we can mitigate their effects on spacecraft and astronauts,” Fox added.
The six individual spacecraft will also work together to map, for the first time, the pattern of magnetic field lines reaching from the sun out into interplanetary space.
NASA's missions of opportunity maximise science return by pairing new, relatively inexpensive missions with launches on spacecraft already approved and preparing to go into space. SunRISE proposed an approach for access to space as a hosted rideshare on a commercial satellite provided by Maxar of Westminster, Colorado, and built with a payload orbital delivery system, or PODS. Once in orbit, the host spacecraft will deploy the six SunRISE spacecraft and then continue its prime mission.
Missions of opportunity are part of the Explorers Program, which is the oldest continuous NASA program designed to provide frequent, low-cost access to space using principal investigator-led space science investigations relevant to the Science Mission Directorate’s (SMD) astrophysics and heliophysics programs.
The program is managed by NASA’s Goddard Space Flight Center in Greenbelt, Maryland, for SMD, which conducts a wide variety of research and scientific exploration programs for Earth studies, space weather, the solar system and universe.
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