Researchers Use Solar Eclipses to Better Understand Plasma Eruptions from the Sun

The significance of this is illustrated by an explanatory note from the reporting: „bei denen große Mengen an Sonnenplasma samt Magnetfeld ins Weltall geschleudert werden. Diese Ausbrüche können sich auch Richtung Erde bewegen und deren Magnetfeld ordentlich durcheinanderschütteln. Die Folgen reichen von harmlosen Polarlichtern bis zu schwerwiegenden Schäden an Satelliten, terrestrischen Transformatoren, Kommunikations- und Energiesystemen.“ In this way, the researchers draw attention to the range of possible consequences of a plasma eruption.

Who is researching this?

Astrid Veronig from the University of Graz is among the scientists investigating the connection between solar eclipses and plasma eruptions. Miho Janvier, also named in the reporting, researches the physical foundations of the ejections on the European side. Both emphasize that the combination of ground-based observations and space instruments enables new insights.

On the ESA side, Carole Mundell is involved in the initiative. The participation of European space research gives the project additional weight, as ESA has its own solar probes and a network of ground stations. Researchers are also based in Leuven, who according to APA are contributing to the preparations. The geographic distribution of the participating institutes reflects the international character of the project.

The upcoming total solar eclipses are considered a rare opportunity by experts, because the path of totality only grazes narrow regions of the Earth each time and the observation windows are correspondingly short. Researchers therefore plan to set up mobile instruments along the path and simultaneously obtain measurements from space. The aim is to create as complete a picture as possible of the processes in the corona.

Methods of Observation

Methodologically, the teams combine spectroscopy, magnetic field measurements, and high-resolution imaging. Spectroscopy allows conclusions to be drawn about the temperature and composition of the plasma, while magnetic field measurements provide information about the strength and direction of the carried fields. High-resolution imaging, in turn, makes visible how structures in the corona change between individual eruptions.

Space Weather and Effects on Earth

In addition to basic research, the project also pursues an applied purpose: early warning systems for so-called space weather events are to be improved. When stronger plasma eruptions reach Earth, power grids, satellites, and communication systems can be disrupted. More accurate models could help to inform operators of critical infrastructure earlier and limit damage.

Researchers point out that even harmless polar lights, which arise during weaker eruptions, provide important clues about the interaction between solar plasma and Earth's magnetic field. The spectrum therefore ranges from pure curiosity about physical phenomena to concrete preparedness planning. This breadth of possible results makes solar eclipses a valuable time window for science.

According to the teams involved, the next observation campaigns are already being prepared. In addition to the University of Graz and ESA, other international partners are involved, including groups in Leuven. Initial results are expected after the completion of the respective measurement campaigns.

Overall, the project shows how a cosmic event such as a solar eclipse can be deliberately used for terrestrial research. As the Moon briefly blocks out the glaring sunlight, the otherwise invisible corona becomes accessible to measuring instruments — and with it the source of those plasma eruptions that in extreme cases can threaten sensitive technology on Earth.