Interplanetary spacecraft capture a coronal mass ejection component hidden from Earth

Interplanetary spacecraft captured a hidden component of a coronal mass ejection (CME) that was not visible from Earth. The study, led by Adrienn Luspay-Kuti at Johns Hopkins University, used an unprecedented network of 17 spacecraft, including NASA's Europa Clipper, to reconstruct the CME's true shape. The CME, which erupted from the sun a few days earlier, was detected near Earth but not at nearby Solar Orbiter, while STEREO-A detected a slower portion of the same event approximately 25 hours later. The component, which was invisible from Earth's perspective, was identified as a faster-moving, asymmetric part of the CME that could pose a threat to astronauts and satellites.

The study highlights how gaps in space weather forecasts can occur when the sun's magnetic field lines become tangled and snap, flinging charged particles into space. Earth-based observations often miss these hidden components, leaving dangerous gaps in predictions. The research shows that a CME can have an asymmetric structure, with a hidden part that is not detected from Earth. The findings suggest that planetary missions in transit could serve as an informal early-warning network, filling in the blind spots left by Earth-based observations.

The study emphasizes the importance of detecting hidden CME components to ensure the safety of future space missions. By using an extensive network of spacecraft, researchers were able to reconstruct the CME's true shape and identify a dangerous, hidden component that would otherwise go unnoticed. This research underscores the need for a more comprehensive approach to space weather forecasting, incorporating both dedicated satellites and planetary missions in transit.

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