The mechanisms that trigger various forms of nova can be magnetic, dust clouds, and even solar rain. These events range from extremely small (flares) to gigantic or superflares and Micronova. Of course, with our weakening magnetosphere, everything the Sun throws at us becomes increasingly impactful. If the 1859 Carrington event, which melted telegraph lines and started fires, were to occur today with our weakened shield, our power grids and electronics would likely be destroyed.
As the magnetosphere continues to weaken, the likelihood of a solar flare capable of destroying our electric grids and electronic devices becomes more likely every day. Cell phones, wireless transmissions, along with increased volcanism, storm severity, and earthquakes, will become problematic in the future.
Hopefully, we will work to harden our electrical grids against solar flare damage before they are taken out prematurely.