... The forcing by the solar wind is able to modify this field, creating a cavity called the magnetosphere. ... The outer boundary of the magnetosphere is called the magnetopause . In front of the dayside magnetopause another boundary called the bow shock is formed because the solar wind is supersonic. ... Solar wind and the magnetic field it carries along ( IMF ) modify the form of the magnetosphere, by pushing it in in the dayside and creating a long magnetotail in the nightside. ...