Topic: Space

Scientists discovered a powerful solar storm from 800 years ago by analyzing ancient trees. This helps us understand how to prepare for future space missions.

The Sun can be very dangerous when it has violent eruptions called solar flares and coronal mass ejections. These events can blast high-energy particles through space, putting astronauts at risk. In the past, there were several such events that occurred between the Apollo 16 and Apollo 17 Moon missions in 1972. If astronauts had been exposed during a lunar mission, they could have faced lethal radiation levels.

Scientists are working to better understand these unpredictable solar events so we can prepare for future space missions. Researchers at the Okinawa Institute of Science and Technology (OIST) developed a new way to uncover evidence of past solar proton events (SPEs). They combined medieval historical records with ultra-precise carbon 14 measurements taken from buried asunaro trees in northern Japan.

The team identified a solar proton event that likely occurred between the winter of 1200 CE and the spring of 1201 CE, a period marked by unusually intense solar activity. This finding was published in the Proceedings of the Japan Academy, Series B. Professor Hiroko Miyahara from the OIST Solar-Terrestrial Environment and Climate Unit explained: "Our method now allows us to efficiently identify sub-extreme SPEs -- events that occur more frequently and are around 10-30% of the size of the most extreme cases, but still hazardous."

Why It Matters

Understanding solar storms is crucial for future space missions. This discovery helps us prepare for potential dangers in space exploration.

Key Facts

• Solar proton events can blast high-energy particles through space, putting astronauts at risk.
• The Okinawa Institute of Science and Technology (OIST) developed a new method to uncover evidence of past solar proton events.
• A solar proton event likely occurred between the winter of 1200 CE and the spring of 1201 CE, marked by unusually intense solar activity.

Key Terms

Solar Proton Events

Violent eruptions on the Sun that can blast high-energy particles through space

Implications

Understanding solar storms is crucial for future space missions. This discovery helps us prepare for potential dangers in space exploration.