Secure Site Login


NOAA Issues Moderate (G2) Geomagnetic Storm Watch for September 11


Just as Hurricane Florence approaches the US mainland and Hurricane Olivia is poised to affect Hawaii, NOAA has issued a G2 (moderate) geomagnetic storm watch for September 11. The G2 storm could exacerbate already modest propagation on HF bands as the planetary K index rises to an estimated value of 6. The G2 forecast stems from a fast-moving stream of coronal hole solar wind that’s expected to hit Earth’s magnetic field. During G2 storms, auroras can appear along the northern tier of the US. Among other effects, a G2 storm could cause HF fading at higher latitudes.