In December 2011 the comet Lovejoy (C/2011 W3), endured extremely close
Supervision showed that the comet Lovejoy C/2011 passed at distance 1,2 radiuses of the Sun from the star center. That is in 140 thousand kilometers from its visible surface, through a zone of the bottom crown where temperature reaches million degrees. Cooper Downs group of the Predictive Science Inc company used a comet as a probe. Watching a tail from an evaporating cometary material, scientists could see details of a solar magnetic field. In connection with computer modeling it allowed the astronomers to create the card of a magnetic field along a trajectory of a comet and to confirm their models. Movement of a tail of a comet, which they observed, confirmed existence of spatial features of a magnetic field of a crown.