Extensive power outages and satellite blackouts that affect air travel and the internet are some of the potential consequences of massive solar storms. These storms are believed to be caused by the release of enormous amounts of stored magnetic energy due to changes in the magnetic field of the sun's outer atmosphere - something that until now has eluded scientists' direct measurement. Researchers believe this recent discovery could lead to better "space weather" forecasts in the future.

"We are becoming increasingly dependent on space-based systems that are sensitive to space weather. Earth-based networks and the electrical grid can be severely damaged if there is a large eruption", says Tomas Brage, Professor of Mathematical Physics at Lund University in Sweden.

Solar flares are bursts of radiation and charged particles, and can cause geomagnetic storms on Earth if they are large enough. Currently, researchers focus on sunspots on the surface of the sun to predict possible eruptions. Another and more direct indication of increased solar activity would be changes in the much weaker magnetic field of the outer solar atmosphere - the so-called Corona.

However, no direct measurement of the actual magnetic fields of the Corona has been possible so far.

"If we are able to continuously monitor these fields, we will be able to develop a method that can be likened to meteorology for space weather. This would provide vital information for our society which is so dependent on high-tech systems in our everyday lives", says Dr Ran Si, post-doc in this joint effort by Lund and Fudan Universities.

The method involves what could be labelled a quantum-mechanical interference. Since basically all information about the sun reaches us through "light" sent out by ions in its atmosphere, the magnetic fields must be detected by measuring their influence on these ions.

But the internal magnetic fields of ions are enormous - hundreds or thousands of times stronger than the fields humans can generate even in their most advanced labs. Therefore, the weak coronal fields will leave basically no trace, unless we can rely on this very delicate effect - the interference between two "constellations" of the electrons in the ion that are close - very close - in energy.

The breakthrough for the research team was to predict and analyze this "needle in the haystack" in an ion (nine times ionized iron) that is very common in the corona.

The work is based on state-of-the art calculations performed in the Mathematical Physics division of Lund University and combined with experiments using a device that could be thought of as being able to produce and capture small parts of the solar corona - the Electron Beam Ion Trap, EBIT, in Professor Roger Hutton's group in Fudan University in Shanghai.

"That we managed to find a way of measuring the relatively weak magnetic fields found in the outer layer of the sun is a fantastic breakthrough", concludes Tomas Brage.

Research paper

Related Links
Lund University
Solar Science News at SpaceDaily

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New studies reveal inside of central energy release region in solar eruption
Beijing, China (SPX) Jul 29, 2020
Prof. LIN Jun from the Yunnan Observatories of Chinese Academy of Sciences, collaborating with Prof. CHEN Bin from the New Jersey Institute of Technology, conducted the radio observation of the magnetic field distribution and relativistic electron acceleration characteristics in the current sheet of solar flares. The related research results were published in the journal Nature Astronomy on July 27, 2020. Solar eruption is the most violent energy release process in the solar system, which is ... read more