Zitai and others made progress in the research direction of coronal mass ejection (figure)
Coronal mass ejection (CME) is a large-scale explosion phenomenon on the sun, accompanied by the release of a large amount of matter and energy. Since the SOHO satellite went to heaven in 1995, the study of coronal mass ejection has been limited to two dimensions. For a corona-shaped corona material ejection propagating toward the earth, the projection effect has a considerable influence on the true judgment of its propagation speed and prediction of when it reaches the earth. Associate researcher Feng Li of the Purple Mountain Observatory of the Chinese Academy of Sciences and his collaborators used the white light corona observations of the two STEREO satellites launched in the United States at the end of 2006 to develop a new method for reconstructing the three-dimensional shape of the corona material ejection (see the three-dimensional results in Figure). This method can be used to determine whether the direction of propagation of corona material ejection can reach the earth or other planets. The work also studied the evolution of coronal mass ejection in interplanetary space, combined with the latest SDO satellite data to verify the characteristics of the source region of the coronal mass ejection. On the other hand, the study used data from planetary exploration to compare the three-dimensional shape of the coronal mass ejection near the sun with the interplanetary coronal mass ejection observed by Venus Express, and found that the reconstructed three-dimensional shape can be used to explain well Information about the magnetic field observed by Venus Express. The work will be published in ApJ, the American Astrophysical Journal. The black sphere on the left is the position of the sun, the red curve area is the three-dimensional space shape of CME, the green sphere is the geometric center of the calculated CME, and the three black lines are the three main axes of the CME three-dimensional geometry. The picture on the right is the projection of the three-dimensional CME seen from the sun's north pole on the solar equatorial plane, which can be used to determine the direction of CME propagation. The figure shows its spatial position relative to the two STEREO satellites STA, STB, Venus, and the line of sight of the earth. Headphone Speaker Display Rack
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