The two correct answers are:
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Scientists who are responsible for tracking and maneuvering satellites - Increased solar energetic particles can affect satellites in orbit, so it is crucial for those who manage satellite operations to be informed.
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Engineers who control power systems to cities in the affected area - Solar energetic particles can potentially disrupt power systems and infrastructure on Earth, so it's important for engineers managing those systems to be notified.
The other options, while they may be indirectly affected, are less critical in terms of immediate operational monitoring and response to solar energetic particle events.