Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes. (2.4GHz, 5.8GHz)
Aurora - Aurora (極光) may be seen as low as New York to Wisconsin to Washington state.