CAPE CANAVERAL, FLORIDA – NASA is preparing to send a probe closer to the sun than any other spacecraft, zooming through its corona, the outermost atmosphere that gives rise to the solar wind.
The Parker Solar Probe, a robotic spacecraft the size of a small car, is slated to launch on Aug. 6 from Cape Canaveral, Florida, with a planned seven-year mission. It will fly into the sun’s corona within 3.8 million miles (6.1 million km) from the solar surface, seven times closer than any other spacecraft.
“To send a probe where you haven’t been before is ambitious. To send it into such brutal conditions is highly ambitious,” Nicola Fox, a project scientist from the Johns Hopkins University Applied Physics Laboratory, told a news conference on Friday.
The previous closest pass to the sun was by a probe called Helios 2, which in 1976 came within 27 million miles (43 million km). By way of comparison, the average distance from the sun for Earth is 93 million miles (150 million km).
The corona gives rise to the solar wind, a continuous flow of charged particles that permeates the solar system. Unpredictable solar winds cause disturbances in our planet’s magnetic field and can play havoc with communications technology on Earth. NASA hopes the findings will enable scientists to forecast changes in Earth’s space environment.
“It’s of fundamental importance for us to be able to predict this space weather, much like we predict weather here on Earth,” said Alex Young, a solar scientist at NASA’s Goddard Space Flight Center in Maryland. “In the most extreme cases of these space weather events, it can actually affect our power grids here on Earth.”
The project, with a $1.5 billion price tag, is the first major mission under NASA’s Living With a Star program.
The probe is set to use seven Venus flybys over nearly seven years to steadily reduce its orbit around the sun, using instruments designed to image the solar wind and study electric and magnetic fields, coronal plasma and energetic particles. NASA aims to collect data about the inner workings of the highly magnetized corona.
The probe, named after American solar astrophysicist Eugene Newman Parker, will have to survive difficult heat and radiation conditions. It has been outfitted with a heat shield designed to keep its instruments at a tolerable 85 degrees Fahrenheit (29 Celsius) even as the spacecraft faces temperatures reaching nearly 2,500 F (1,370 C) at its closest pass.