Scientists would predict that several things might happen due to solar flares. The most common responses include:
- Power grid operations will go offline
- High-frequency radio waves used for radio communication will be blocked
- Radio navigation systems and global positioning systems will be inaccurate
- Electrical systems in satellites will fail
Each of these options can indeed be affected by solar flares, but if we were to select one key impact, it would be that "power grid operations will go offline" as this is often a significant concern in relation to strong solar activity.
However, all responses accurately describe potential effects of solar flares.