A pair of precision-orbiting small satellites will attempt to capture the first views ever of small-scale features near the surface of the Sun that scientists believe drive the heating and acceleration of solar wind.
Heliophysicist Dr. Doug Rabin at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, said photon sieves, a technology that can focus extreme ultraviolet light, should be able to resolve features 10 to 50 times smaller than what can be seen today with the Solar Dynamics Observatory’s EUV imager.
To be most effective, however, they must be wide, super-thin, and etched with precise holes to refract light. Working in Goddard’s Detector Development Laboratory, Goddard engineer Kevin Denis developed new ways to create wider and thinner membranes from wafers of silicon and niobium. Each advancement so far has required additional steps to protect the resulting sieves, such as leaving a honeycomb of thicker material to support the membrane and prevent tearing.