The two correct answers to notify in the event of 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 aware of solar activity as it can affect aviation safety and navigation.
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Scientists who are responsible for tracking and maneuvering satellites - Solar energetic particles can impact satellite operations and communications, so they need to be informed.
The other options, while they may be affected indirectly (such as engineers controlling power systems), are less directly relevant to the immediate risks posed by solar energetic particles. Computer technicians charging new computers at a warehouse would not be significantly impacted compared to the other two groups.