Tag: sun

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Massive Solar Flare Hits 2025 Peak: Africa & Europe Face Radio Blackouts

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On November 11, 2025, a powerful X5.1 solar flare erupted from sunspot AR4274 during solar cycle 25’s peak, causing R3-level radio blackouts across Africa and Europe. The flare’s soft X-rays ionized the ionosphere, disrupting high-frequency (HF) radio used in aviation, maritime, and emergency services, while also causing GPS errors and radar interference. A coronal mass […]

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Q&A

What Time and How Much Sun Exposure is Best for Vitamin D?

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To optimize vitamin D synthesis, aim for 10 to 30 minutes of sun exposure between 10 AM and 3 PM, when UVB rays are strongest. Lighter skin tones typically need less time, while darker skin tones may require three to six times more. Geographic location and seasonal changes also affect exposure needs. Balance sunshine intake […]

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