http://www.bbc.co.uk/news/science-environment-18089695
The superflares discussed in the article refer to the magnetic energy released by stars possessing large starspots. The risk associated with these particles being channelled toward orbiting space bodies, like our Earth, is the fact that they have the ability to damage a planets atmosphere which may eliminate the conditions needed for life to thrive on the planet. Luckily, our Sun rotates slowly and therefore its superflares do not occur frequently. Over a long period of time however, the predicted effect of superflares on the Earth and its atmosphere is that they will lead to the further breakdown of the ozone layer. This will allow excess radiation to reach the species residing on the surface of the Earth resulting in their eventual extinction. On the other hand, it is thought that these superflares also have the ability to provide the activation energy needed to initiate the chemical reactions that yield the products neccessary for life to begin on these planets. I don't believe that we will be able to protect the Earth and other space bodies from these superflares. Nature may just have to take its course in this case, and we will have to deal with the consequences in the future. But with scientific advancements today, you never know!