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Solar sail powered data clippers

  • 22 Jul 2021 15:40
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According to Joel Poncy of Thales Alenia Space, (does he read Charles Stross?) technology could be ready in time to support mid-term missions to the moons of Jupiter and Saturn.

Poncy will be presenting an assessment of data clippers at the European Planetary Science Congress (EPSC) 2010 in Rome today.

“Space-rated flash memories will soon be able to store the huge quantities of data needed for the global mapping of planetary bodies in high resolution.  But a full high-res map of, say, Europa or Titan, would take several decades to download from a traditional orbiter, even using very large antennae.  Downloading data is the major design driver for interplanetary missions.  We think that data clippers would be a very efficient way of overcoming this bottleneck,” says Poncy.

He and his team at Thales Alenia Space have carried out a preliminary assessment for a data clipper mission.  Their concept is for a clipper to fly close to a planetary orbiter, upload data and fly by Earth, at which point terabytes of data could be downloaded to the ground station. A fleet of data clippers cruising the Solar System could provide support for an entire suite of planetary missions.

“We have looked at the challenges of a data clipper mission and think that it could be ready for a launch in the late 2020s. This means that the technology should be included now in the roadmap for future missions, and this is why we are presenting this study at EPSC,” said Poncy.

Poncy’s team have assessed the communications systems and tracking devices that a data clipper would need, as well as the fly-by conditions and pointing accuracy required for the massive data transfers.

Recent technology advances mean spacecraft propelled by solar sails, using radiation pressure from photons emitted by the Sun, or electric sails that harness momentum from the solar wind, can be envisaged for mid-term missions. JAXA the Japanese Space Agency is currently testing a solar sail mission, IKAROS.

“Using the Sun as a propulsion source has the considerable advantage of requiring no propellant on board.  As long as the hardware doesn’t age too much and the spacecraft is manoeuvrable, the duration of the mission can be very long.

The use of data clippers could lead to a valuable downsizing of exploration missions and lower ground operation costs – combined with a huge science return. Orbiting spacecraft would still download some samples of their data directly to Earth to enable real-time discoveries and interactive mission operations. 

But the bulk of the data is less urgent and often processed by scientists much later.  Data clippers could provide an economy delivery service from the outer Solar System, over and over again,” said Poncy.

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