The two correct answers to notify about the increased chances of solar energetic particles in the ionosphere are:
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Flight operations officers who devise airline flight plans - They need to be informed to ensure the safety of flights, as solar energetic particles can affect aircraft systems and navigation.
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Scientists who are responsible for tracking and maneuvering satellites - They should be notified because solar energetic particles can pose risks to satellites in orbit, affecting their operation and potentially leading to damage.
Notifying computer technicians and engineers controlling power systems may be important in certain circumstances, but the immediate priority in relation to solar energetic particles typically focuses on aviation safety and satellite operations.