Key Takeaways
1. Caltech scientists recreated stable twisted plasma tubes that form solar flares in a lab setting.
2. Their experiments produced solar flare models with structures resembling double helices, using magnetized plasma.
3. They discovered that parallel electric currents attract, but antiparallel currents repel, leading to a stable state at a specific helical angle.
4. The research solves a long-standing mystery about the behavior of braided magnetic structures in the solar corona.
5. A mathematical model developed from their findings accurately predicts the structure of the Double Helix Nebula, demonstrating broader applicability.
A pair of scientists from Caltech has been exploring the structures found in the solar corona and have successfully found and recreated a stable state for the twisted plasma tubes that form solar flares. Their research, published in Physical Review Letters, explains how these intertwined magnetic structures maintain their shape. The results also indicate that this behavior occurs consistently across different scales.
Creating Solar Flare Replicas
In their lab, the team was able to construct solar flare models that reached lengths of up to 50 centimeters using a vacuum chamber. The magnetized plasma generated during their experiment naturally formed a twisted structure consisting of two “flux ropes” that entwined around each other, creating a stable double helix formation.
Solving a Long-Standing Mystery
Their investigation has shed light on a mystery that has puzzled researchers for a long time. Previously, it was believed that the parallel electric currents observed in these braided ropes would pull them together until they collided. However, these Caltech scientists showed that while the electrical currents along the ropes attract each other, the parts of the currents moving in the wrapping direction repel one another due to being antiparallel. At a specific “critical helical angle,” where the opposing magnetic forces are balanced, a stable, low-energy state is achieved.
A Mathematical Model
To illustrate that their findings can be applied on a larger scale, the researchers developed a mathematical model that not only predicted how these structures behaved in their laboratory but also accurately represented the structure of the Double Helix Nebula. This nebula is a plasma formation that spans 70 light-years and is located 25,000 light-years from Earth. By simply using the observable diameter and twist of the nebula, the model was able to predict its stable structure correctly.
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