China News Service, July 5th, title: Samsung network China will achieve 100% coverage of global observational data
Author Zheng Yingying Chen Su Ma Shuaisha
On July 5, China used the Long March 4C carrier rocket at the Jiuquan Satellite Launch Center to send the "Dawn Star" Fengyun-3E into a predetermined orbit.
Stars and arrows are all developed by the Eighth Academy of China Aerospace Science and Technology Corporation.
According to Li Haisheng, the commander-in-chief of the Fengyun-3 E-satellite, the E-satellite is the first satellite of China's second-generation low-orbit meteorological satellites to operate in the twilight orbit.
Through the three-star network of morning, afternoon, and twilight satellites, China will achieve 100% coverage of global observational data.
The successful launch and on-orbit application of the Fengyun-3 E satellite will effectively improve and improve the accuracy and timeliness of global numerical weather forecasts, and make important contributions to the digital weather forecasts of China and the International Meteorological Organization.
Enhance China's right to speak in international meteorological affairs
The successful launch and in-orbit operation of the Fengyun-3 E satellite will enhance China’s capabilities in applications such as weather forecasting and forecasting, response to climate change, environmental and ecological monitoring, and space weather early warning, improve China’s existing meteorological operational observation system, and enable China to In terms of business, it has formed a trend of equivalent complementarity with European and American satellites.
Relying on the unique global observational data of the Fengyun-3E satellite, China can carry out multi-directional bilateral and multilateral technical cooperation and exchanges with other developed meteorological countries in the world, and further enhance its right to speak and influence in international meteorological affairs.
Fengyun-3 E-star development scene by Chen Jun
The new track brings "time-dependent weather"
Similar to the United States and Europe, China’s previous satellite observation time was concentrated around 10 a.m. and 2 p.m., within the assimilation time window of observations every 6 hours, there are always 2 to 3 orbits of satellite observations in the blank area around the world, unable to provide global Initial observation of coverage.
The successful launch of the Fengyun-3 E satellite made up for the shortcomings of the satellite observation orbit and the lack of observational data, and will make a significant contribution to the forecast of the northern and southern hemispheres and regional forecasts on the intercontinental scale.
With the new orbit, the FY-3E satellite can enable consultation personnel of weather forecast agencies in many countries and regions around the world to get the closest satellite images and products with the latest data every morning, providing the most time-sensitive weather forecasts Information.
At the same time, due to the largest difference in surface temperature and atmospheric boundary layer temperature during the twilight satellite observation period, less cloud cover, and lower absolute humidity, it is helpful for the Fengyun-3E satellite to use infrared emission principles to carry out remote sensing observations of atmospheric gases and air quality monitoring. .
For climate research, a complete sample of daily changes in surface temperature, atmospheric temperature, atmospheric humidity, and precipitation is very important. By supplementing the morning and afternoon orbital system data, the FY-3E star can achieve infrared and microwave radiation in most parts of the world. With 6 measurements per day in the band, the network can significantly improve the climate monitoring capabilities of low-orbit meteorological satellites.
Unique application in morning mist, typhoon, etc.
Compared with the morning satellite and the afternoon satellite, the sun altitude angle is low during the observation of the twilight orbit satellite, and the geometric characteristics of the terrain and cloud top height are more obvious. Using this advantage, the Fengyun-3E satellite can be used in morning fog, typhoon, and strong convection. Develop unique applications in monitoring and analysis.
Wang Jinhua, the chief designer of the Fengyun-3 E satellite, informed that the medium-resolution spectral imager mounted on the Fengyun-3 E satellite has added a wide and high-sensitivity low-light imaging channel with a dynamic range of 7 orders of magnitude, which is the most advanced in China. Quantitative global low-light detection instruments can achieve high-precision quantitative inversion of atmospheric, land, and ocean parameters after in-orbit application, greatly improving monitoring accuracy.
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