The craft will endure extreme heat while zooming through the solar corona to study the Sun’s outer atmosphere that gives rise to the solar winds. It is set to fly into the Sun’s corona within 3.8 million miles (6.1 million km) of the solar surface, seven times closer than any other spacecraft. The corona gives rise to the solar wind, a continuous flow of charged particles that permeates the solar system and can cause havoc with communications technology on Earth.
Source: Yahoo! News