NASA probe reveals unexpected particle behavior during solar explosion
NASA scientists have reported a surprising discovery from the Parker Solar Probe, which observed unusual particle behavior during a solar explosion, offering new insight into how solar storms form.
During a close flyby of the Sun in 2022, the probe passed through a magnetic reconnection event, a process in which twisted magnetic field lines snap and reconnect, releasing large amounts of energy. This phenomenon drives solar storms across the solar system. Positioned between the Sun and the event, the spacecraft detected a jet of particles moving inward, composed of protons and heavier ions.
The key finding was the stark difference in how these particles behaved. Existing models predicted that protons and heavy ions would accelerate in similar ways. Instead, the data showed that protons spread out widely in a diffuse beam, while heavier ions traveled in a tight, concentrated stream.
NASA compared the contrast to a flashlight versus a laser. The protons formed a broad, scattered flow, while the heavier ions remained narrowly focused. This divergence challenges established theories about particle acceleration in solar eruptions.
Magnetic reconnection plays a central role in space physics. It occurs in the Sun’s outer atmosphere and can trigger coronal mass ejections, which release superheated plasma into space. When directed toward Earth, these events can disrupt power grids, radio communications, and satellite navigation systems.
Because the solar corona is difficult to observe directly, the event captured by the probe in the solar wind provided a rare opportunity to measure particles accelerated by such explosions in real conditions. The findings, published in the The Astrophysical Journal, are expected to improve models of magnetic reconnection and help scientists better understand how solar storms gain energy.
Launched in 2018, the Parker Solar Probe continues to deliver data as it operates in extreme conditions near the Sun. In March, it completed its 27th close approach, matching its record distance of 6.1 million kilometers from the solar surface while traveling at speeds of about 692,000 kilometers per hour.
Future mission phases, planned for late 2026 and beyond, remain under review. Each pass provides new data on the Sun’s behavior during its active 11-year solar cycle.
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