Comets are brightest at and shortly after perihelion, when they literally the heat Solar radiationvaporizes both exposed surface ices and ice locked beneath the comet coal black crust. Vaporizing subsurface ice can created pressurized pockets of gas that seek a way out either through an existing vent or hole or by breaking through the porous crust and erupting geyser like into space.Jets carry along dust that helps create a comet fuzzy coma or temporary atmosphere, which are further modified into tails by the solar wind and the pressure of sunlight. When conditions and circumstances are right, these physical processes can build comets, the sight of which canfill the human heart with both terror and wonder.Rosetta found that the brief and powerful jet did more than make a spectacle it alsopushed away the solar wind magnetic field from around the nucleus as observed by the ship Normally, the Sun wind is slowed to a standstill when it encounters the gas cloud surrounding the nucleus.”The solar wind magnetic field starts to pile up, like a traffic jam, and eventually stops moving towards the comet nucleus, creating a magnetic field free region on the Sun facing side of the comet called a ‘diamagnetic cavity’,” explained Charlotte Gtz, magnetometer team member, on the ESA Rosetta website.

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