What are the three types of solar flares categorized from greatest to least intensity?

The correct categorization of solar flares from greatest to least intensity is X, M, C. Solar flares are classified into these groups based on their peak brightness in the X-ray spectrum.

The X class represents the most intense flares, which can have significant effects on the Earth's ionosphere and can disrupt communications and navigation systems. M class flares are moderate intensity flares, capable of causing minor impacts on Earth. The C class signifies the least intense flares, which typically have a much lower impact compared to M and X class flares.

Understanding this classification is important for monitoring solar activity and anticipating potential effects on Earth and in space, especially for satellite operations and communication systems.