GEOMAGNETIC STORM: A CME hit Earth's magnetic field on Sept. 9th, and the impact ignited a geomagnetic storm, in progress. Northern Lights have since been spotted in the United States as far south as as Michigan, Montana and North Dakota. This could be the first of several hits from a series of CMEs expected to reach Earth during the weekend, so more geomagnetic activity is in the offing~
Remember, Geomagnetic storms can cause difficulties in communicating over long distances
Many communication systems utilize the ionosphere to reflect radio signals over long distances. Ionospheric storms can affect radio communication at all latitudes. Some radio frequencies are absorbed and others are reflected, leading to rapidly fluctuating signals and unexpected propagation paths. TV and commercial radio stations are little affected by solar activity, but ground-to-air, ship-to-shore, Voice of America, Radio Free Europe, and amateur radio are frequently disrupted. Radio operators using high frequencies rely upon solar and geomagnetic alerts to keep their communication circuits up and running.
Some military detection or early-warning systems are also affected by solar activity. The Over-the-Horizon Radar bounces signals off the ionosphere in order to monitor the launch of aircraft and missiles from long distances. During geomagnetic storms, this system can be severely hampered by radio clutter. Some submarine detection systems use the magnetic signatures of submarines as one input to their locating schemes. Geomagnetic storms can mask and distort these signals.