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SOHO Hotshots
Solar cycle 20 - Wikipedia
Powerful solar flare knocks out radio: 'One of the largest ever recorded
اندلاع شمسي - المعرفة
What can we do to prevent a solar flare from hitting the Earth? - Quora
Powerful solar flare knocks out radio: 'One of the largest ever
The Biggest Solar Flare In 17 Years: What Happened, Why It Matters
Powerful solar flare knocks out radio communications on Earth
World's oldest trees reveal the largest solar storm in history - Big Think