Geo-engineering to protect against solar storms

- The paper (published in AGU's *Space Weather* journal) proposes injecting reflective particles into the upper atmosphere — similar to stratospheric aerosol injection schemes for climate engineering — as a way to shield Earth from solar storms (coronal mass ejections and solar energetic particles). - Solar storms can damage power grids, satellites, and aviation electronics by inducing geomagnetic currents and increasing radiation levels; the 1859 Carrington Event is the canonical example of what a major storm could do to modern infrastructure. - The authors model how reflective aerosols (e.g., alumina or sulfur dioxide) placed at the L1 Lagrange point, or directly into the stratosphere, could deflect or absorb incoming solar particles before they reach Earth's magnetic field. - This is a speculative, early-stage concept, not a practical proposal. Key unknowns include cost, side effects (e.g., ozone depletion, altered atmospheric heating), and whether the engineering challenges (sustaining a shield at L1 or continuously replenishing stratospheric aerosols) can be overcome.