The phrase "solar wind" refers to a constant stream of charged particles (mostly electrons and protons) coming from the Sun. It blows outward in all directions and can interact with planets and other objects in space. Full definition
However, there appears to be a small deviation during the solar maximum of cycle 22, which is likely related to high pressure of solar wind plasma flow velocity. (swsc-journal.org)
Besides being found in stars and in our sun, plasma is transported by solar winds and magnetic fields, often coming into contact with dust clouds like those the researchers studied. (science.howstuffworks.com)
The other possibility is that longer - term variations in solar wind could be responsible for changes in cloud formation triggered by cosmic rays. (scholarsandrogues.com)