Solar sigmoids explained
Mon Apr 20, 2009 at 10:36 UTC
'Sigmoids' are S-shaped structures found in the outer atmosphere of the Sun (the corona), seen with X-ray telescopes and thought to be a crucial part of explosive events like solar flares. Now a group of astronomers have developed the first model to reproduce and explain the nature of the different stages of a sigmoid's life.
Recently, the X-Ray Telescope (XRT) on board the Hinode space mission was used to obtain the first images of the formation and eruption phase of a sigmoid at high resolution.
These observations revealed that the structure of the sigmoid is complex: it consists of many, differently oriented, loops that all together form two opposite J-like bundles or an overall S-shape. They also showed that at the end of its life the sigmoid produces a 'flare' eruption.
Over the years a series of theoretical and numerical models have been proposed to explain the nature of sigmoids but until now there was no explanation on how such complex structures form, erupt and fade away. The new model describes how sigmoids consist of many thin and twisted layers (or ribbons) of strong electric current. When these layers interact it leads to the formation of the observed powerful flares and the eruption of strong magnetic fields which carry highly energetic particles into interplanetary space.
Dr. Archontis sees the connection between the two astronomers' model and work on predicting solar flares. He remarks, "Sigmoids work as 'mangers' or 'cocoons' for solar eruptions. There is a high probability that they will result in powerful eruptions and other explosive events. Our model helps scientists understand how this happens."
Prof. Hood adds that these events have real significance for life on Earth, "Sigmoids are among the most interesting features for scientists trying to forecast the solar eruptions - events that can disrupt telecommunications, damage satellites and affect the way navigation systems are operated".
Credit: NASA/STFC/ISAS/JAXA/ A. Hood (St. Andrews), V. Archontis (St. Andrews)
The left panel shows one snapshot from the St Andrews model and the right panel the 'corresponding' snapshot from the Hinode satellite observations. The two images both show the 'internal complex structure' of the solar sigmoid, which has been observed at very high resolution and is reproduced in the model. The 'sigmoids' consist of a network of thin 'ribbons' where the electric current is strong and the material is heated to between 1 and 2 million degrees Celsius.
Credit: NASA/STFC/ISAS/JAXA/A. Hood (St. Andrews), V. Archontis (St. Andrews)
Running from top to bottom, these figures show the evolution of the sigmoid over three hours leading up to its final eruption. Columns 1 and 2 show results from the St Andrews model. The left column shows the strength of electric current predicted by the model and the central panel shows predictions of temperature. Column 3 shows the development of the sigmoid observed by Hinode. The model successfully predicts the shape of the sigmoid, internal structure and distribution of heat along its length.
| Source: Royal Astronomical Society | |
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