I would surmise they’re talking about a system to let us know where the worst effects are happening so people can prepare. This article says the fastest storms take 15-18 hours to arrive and most are slower. https://www.swpc.noaa.gov/phenomena/coronal-mass-ejections
I would surmise they’re talking about a system to let us know where the worst effects are happening so people can prepare. This article says the fastest storms take 15-18 hours to arrive and most are slower. https://www.swpc.noaa.gov/phenomena/coronal-mass-ejections