Overview
- The geomagnetic storm arrived Friday night and is expected to continue through Sunday, with NOAA keeping the event at G1 (minor) and a modest chance of rising to G2 (moderate).
- NOAA and space‑weather centers say the disruption stems from a high‑speed solar wind stream from a coronal hole rather than a solar flare or coronal mass ejection, which makes effects shorter and more predictable.
- Forecasts list possible short, localized interference to satellites, GPS navigation and some radio frequencies used in aviation and marine navigation, and operators have been advised to monitor systems closely.
- NOAA provided probabilistic guidance including an estimated roughly 35% chance of point failures on very specific aviation/navigation radio frequencies, but officials do not expect widespread power or communications outages in Brazil.
- Higher‑latitude regions may see visible auroras, and the main practical impact for people is limited: brief GPS or radio glitches and precautionary measures by satellite, aviation and utility operators.