On south aspects, the highest solar radiation occurs between which hours?

On south aspects, the highest solar radiation occurs between which hours?

• A. 0600-1000
• B. 1000-1400
• C. 1400-1800
• D. 0800-1200

Answer: (B)

The main idea is that solar radiation on south-facing slopes is strongest when the sun is highest in the sky, around solar noon. That means the period around midday, roughly 10:00 to 14:00, captures the peak direct solar flux. Earlier in the morning the sun is lower and radiation is weaker, and later in the afternoon the sun has dropped again, reducing intensity. Therefore, the window that best represents the peak is 1000–1400 hours.

The main idea is that solar radiation on south-facing slopes is strongest when the sun is highest in the sky, around solar noon. That means the period around midday, roughly 10:00 to 14:00, captures the peak direct solar flux. Earlier in the morning the sun is lower and radiation is weaker, and later in the afternoon the sun has dropped again, reducing intensity. Therefore, the window that best represents the peak is 1000–1400 hours.