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Space weather forecasting needs an upgrade to protect future Artemis astronauts

June 15, 2024
in Science
Space weather forecasting needs an upgrade to protect future Artemis astronauts
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a raging fiery yellow and organge sun blazes from the right, filling two-thirds of the image. the star spits an arch of plasma high above its surface. so hot

(Image credit: NASA/Goddard Space Flight Center)

NASA has set its sights on the moon, aiming to send astronauts back to the lunar surface by 2026 and establish a long-term presence there by the 2030s. But the moon isn’t exactly a habitable place for people.

Cosmic rays from distant stars and galaxies and solar energetic particles from the sun bombard the surface, and exposure to these particles can pose a risk to human health.

Both galactic cosmic rays and solar energetic particles, are high-energy particles that travel close to the speed of light.

While galactic cosmic radiation trickles toward the moon in a relatively steady stream, energetic particles can come from the sun in big bursts. These particles can penetrate human flesh and increase the risk of cancer.

Related: Artemis 1 will carry a space weather cubesat to study solar wind

Earth has a magnetic field that provides a shield against high-energy particles from space. But the moon doesn’t have a magnetic field, leaving its surface vulnerable to bombardment by these particles.

During a large solar energetic particle event, the radiation dosage an astronaut receives inside a space suit could exceed 1,000 times the dosage someone on Earth receives. That would exceed an astronaut’s recommended lifetime limit by 10 times.

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NASA’s Artemis program, which began in 2017, intends to reestablish a human presence on the Moon for the first time since 1972. My colleagues and I at the University of Michigan’s CLEAR center, the Center for All-Clear SEP Forecast, are working on predicting these particle ejections from the Sun. Forecasting these events may help protect future Artemis crew members.

The members of the 2017 NASA Astronaut Class are (from top left) Matthew Dominick, Kayla Barron, Warren Hoburg, Josh Kutryk, Bob Hines, Frank Rubio, Jenni Sidey-Gibbons, Jasmin Moghbeli, Jessica Watkins, Raja Chari, Jonny Kim, Zena Cardman, and Loral O'Hara.

The members of the 2017 NASA Astronaut Class are (from top left) Matthew Dominick, Kayla Barron, Warren Hoburg, Josh Kutryk, Bob Hines, Frank Rubio, Jenni Sidey-Gibbons, Jasmin Moghbeli, Jessica Watkins, Raja Chari, Jonny Kim, Zena Cardman, and Loral O’Hara. (Image credit: NASA/Bill Stafford)

An 11-year solar cycle 

The Moon is facing dangerous levels of radiation in 2024, since the sun is approaching the maximum point in its 11-year solar cycle. This cycle is driven by the Sun’s magnetic field, whose total strength changes dramatically every 11 years. When the Sun approaches its maximum activity, as many as 20 large solar energetic particle events can happen each year.

Both solar flares, which are sudden eruptions of electromagnetic radiation from the sun, and coronal mass ejections, which are expulsions of a large amount of matter and magnetic fields from the Sun, can produce energetic particles.

The sun is expected to reach its solar maximum in 2026, the target launch time for the Artemis 3 mission, which will land an astronaut crew on the moon’s surface.

While researchers can follow the sun’s cycle and predict trends, it’s difficult to guess when exactly each solar energetic particle event will occur, and how intense each event will be. Future astronauts on the moon will need a warning system that predicts these events more precisely before they happen.

Forecasting solar events 

In 2023, NASA funded a five-year space weather center of excellence called CLEAR, which aims to forecast the probability and intensity of solar energetic particle events.

Right now, forecasters at the National Oceanic and Atmospheric Administration Space Weather Prediction Center, the center that tracks solar events, can’t issue a warning for an incoming solar energetic particle event until they actually detect a solar flare or a coronal mass ejection. They detect these by looking at the sun’s atmosphere and measuring X-rays that flow from the Sun.

Once a forecaster detects a solar flare or a coronal mass ejection, the high-energy particles usually arrive to Earth in less than an hour. But astronauts on the moon’s surface would need more time than that to seek shelter. My team at CLEAR wants to predict solar flares and coronal mass ejections before they happen.

two grey spheres in side-by-side images emit grey, green and pink loopy lines that extend and return to points all over.

The solar magnetic field is incredibly complex and can change throughout the solar cycle. On the left, the magnetic field has two poles and looks relatively simple, though on the right, later in the solar cycle, the magnetic field has changed. When the solar magnetic field looks like the illustration on the right, solar flares and coronal mass ejections are more common. (Image credit: NASA’s Goddard Space Flight Center/Bridgman, CC BY)

While scientists don’t totally understand what causes these solar events, they know that the sun’s magnetic field is one of the key drivers. Specifically, they’re studying the strength and complexity of the magnetic field in certain regions on the sun’s surface.

At the CLEAR center, we will monitor the sun’s magnetic field using measurements from both ground-based and space-based telescopes and build machine learning models that predict solar events – hopefully more than 24 hours before they happen.

With the forecast framework developed at CLEAR, we also hope to predict when the particle flux falls back to a safe level. That way, we’ll be able to tell the astronauts when it’s safe to leave their shelter and continue their work on the lunar surface.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Dr. Lulu Zhao is an assistant research scientist in the Climate and Space Sciences and Engineering. Her research focus is the modelling of the acceleration and transport of energetic particles using M-FLAMPA (multiple-field-line-advection-model with particle acceleration). The M-FLAMPA model extract magnetic field lines from the magnetohydrodynamics (MHD) simulations of the background solar wind solution through SWMF (space weather frame work). Along those magnetic field lines, the particle transport and acceleration are modelled by solving the particle transport equations.

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Copyright for syndicated content belongs to the linked Source : Space.com – https://www.space.com/space-weather-forecasting-needs-upgrade-for-artemis-astronauts

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