REDISTRIBUTION OF MAGNETIC HELICITY AT THE SUN

Evolution of magnetic loops associated with filaments and coronal mass ejections involves a redistribution of solar magnetic helicity. Two m echanisms of the helicity redistribution are discussed. The first one involves magnetic reconnections among magnetic loops and can introduce helicity into an erupting magnetic field accompanied with an encaptur e of helicity by the Sun. The second one involves the MHD helicity red istribution in the Sun and indicates that the magnetic helicity of eac h hemisphere of the Sun oscillates about a mean with the half-period o f the solar cycle (11 years), but does not change sign from one 11 yea r period to the next.