The important part for answering this question is: The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona.
This justifies what answer for what question? Q & A: 
Passage: The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona. This plasma consists of mostly electrons, protons and alpha particles with kinetic energy between 0.5 and 10 keV. Embedded within the solar-wind plasma is the interplanetary magnetic field. The solar wind varies in density, temperature and speed over time and over solar latitude and longitude. Its particles can escape the Sun's gravity because of their high energy resulting from the high temperature of the corona, which in turn is a result of the coronal magnetic field.

Question: Based on this passage, what is made up of charged particles that continually escape from the corona?
The solar wind