NASA is ready to dispatch a $1.5 billion spacecraft on a fiercely hot voyage toward the Sun, offering scientists the nearest ever view of our strange and mysterious star. After the Parker Solar Probe blasts off from Cape Canaveral, Florida on August 11, it will end up being the first spacecraft ever to fly through the Sun’s scorching atmosphere, known as the corona.
Understanding how the corona works will help scientists anticipate dangerous space weather storms.
“It’s of fundamental significance for us to be able to predict space weather much the way we predict weather on Earth,” clarified Alex Young, a solar scientist at NASA.
The unmanned probe is named after Eugene Parker, the 91-year-old pioneering solar astrophysicist, and the US space agency has coined it as the first mission to “touch the sun”. It will actually skim by at a distance of 3.83 million miles (6.16 million kilometers) above the sun’s surface.
The sun-facing side of the probe will endure temperatures of about 2,500 degrees Fahrenheit (1,370 Celsius). The spacecraft is protected by a heat shield that will keep it close to room temperature, about 85 degrees Fahrenheit.
Speeding by at a pace of 430,000 miles per hour will make it “the fastest human-made object.” Over the course of its seven-year mission, the spacecraft aims to pass through the corona 24 times, said project scientist Nicky Fox of the Johns Hopkins University Applied Physics Lab.
As we go from the surface of the sun, which is 10,000 degrees Fahrenheit, and move up into the corona, we find ourselves quickly at millions of degrees,” he said. NASA calls this mismatch “the coronal heating problem,” and hopes the Parker Solar Probe will solve the mystery of why the corona reaches temperatures of up to 10 million degrees Fahrenheit.
The probe is protected by a 4.5-inch-thick (11.43-centimeter) carbon-composite shield, built to withstand 500 times the sun’s radiation on Earth. A series of instruments on board the spacecraft will measure the magnetic and electric fields, plasma waves, and high energy particles. The goal is to have the instruments on all the time but the prime science gathering for us is about 11 days.
A 45-minute launch window opens on Saturday at 3:48am. Awaiting liftoff, the car-sized probe is already packed on to the Delta IV-Heavy rocket at Cape Canaveral Air Force Station in Florida.
Source: Agence France Presse (AFP)