2024-02-06 06:32:45
Nanjing, February 6, 2024 (Xinhua) Using spectroscopic imaging data of China’s first solar exploration satellite “Shihe”, a group of Chinese physicists has built 3D velocity diagrams of two types of plasma in the sun’s atmosphere.
The dark bands hanging in the corona are cooler and denser than the surrounding matter, so long dark bands appear on a bright background. When they appear at the edge of the Sun’s surface, they display bright structures called prominences.
Sheikha, a space telescope operating in sun-synchronous orbit, is exploring space for Hα solar spectroscopic imaging of the entire heliosphere. It can scan the entire heliosphere within 46 seconds, obtain spectral information at any point on the Sun, and map the dynamics of the dark band.
Based on Sheikha’s observations, researchers from Nanjing University demonstrated the expansion, emergence, retreat, rotation and division of the dark band and the solar prominence, according to a press release issued by the China National Space Administration last Monday.
Explosive dark bands, if they spread towards Earth, may lead to geomagnetic storms, causing serious damage to equipment in near-Earth space.
The researchers said that accurate measurement of the three-dimensional velocity fields of this plasma is of great importance for early warning and prediction of catastrophic space weather.
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