2020-07-16

Two months before the launch of China’s Mars rover”Tianwen-1″, the chief scientist regretted his death

By yqqlm yqqlm

Recently, the Martian probe”Tianwen 1″ developed by the China Academy of Space Technology has arrived at the Wenchang launch site in Hainan. Preparations are underway and it is expected to be launched on July 23. This time node, because this is the Mars launch window, every 18 to 24 months, the navigation distance between the moon and Mars will be shortened from 9 months to 7 months. If it is not possible to lift off during the &34;launch window&34;, the detection mission will have to wait another two years.

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This is the first Mars exploration mission in China. It consists of an orbiter and a Mars rover composition. According to the plan, the Martian exploration mission of”Tianwen-1″ must complete the three major tasks of”circling, falling, and patrolling” at one time, which also marks the official opening of my country’s planetary exploration.

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However, in the two months before the launch of”Tianwen 1″, Wan Wanxing, an academician of the Chinese Academy of Sciences and a researcher of the Institute of Geology and Geophysics, Chinese Academy of Sciences, due to illness He died in Beijing at the age of 62.

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Wan Weixing is the chief scientist of China’s first Mars exploration program. However, China’s first Mars probe, Tianwen-1, has not yet been launched, but the chief scientist regrets his death and cannot witness this historical moment. .

Wan Weixing was born in 1958. He is a purely domestic scientist, mainly engaged in the research of ionospheric physics, ionospheric radio wave propagation, upper atmospheric physics and other fields, and major sciences such as the coupling of ionosphere and atmosphere. An important breakthrough and a series of achievements have been made in the study of the problem.

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Right twenty thousand satellites

When studying for a master’s degree, his research thesis was to study the frequency profile inversion of ionospheric motion profile and sound-gravity wave disturbance. The plotter controls the plotter to move on the trace of the high frequency map, automatically reads the high frequency map into the computer program, and can perform calibration and correction, which greatly improves the computer entry efficiency and digital precision of the high frequency map. As a result, Wansat has realized the ionospheric altimeter frequency-height map to retrieve the ionospheric motion profile and study ionospheric disturbance analysis for the first time in the world.

Wan Weixing’s master’s research work has aroused great repercussions in the international academic community. After seeing the research results, the internationally renowned ionosphere expert Prof. Ruilixi from the University of Lowell invited and sponsored Wan Wanxing. Satellite went to the United States to study for a doctorate degree, but Wan Weixing gave up, and instead provoked the heavy task of developing the ionospheric discipline at the Wuhan Institute of Physics, Chinese Academy of Sciences.

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In his 30 years of scientific research, he discovered the main regional characteristics of ionospheric disturbances in China from experimental observations, and proposed that the topography of the Qinghai-Tibet Plateau and the associated low vortex weather are our marching style The assertion that ionospheric disturbances are important sources of excitation. From the analysis of global GPS observation data, the longitude”four-wave” structure of the total ion content of the low-latitude ionosphere is found, and the system reveals the climatological characteristics of the ionospheric”four-wave” phenomenon and its difference from the atmospheric non-migratory tides The connection of the weights demonstrates the mechanism of atmospheric tidal excitation of the longitude structure of the ionosphere. In addition, the control effect of solar wind on the sudden ionosphere E layer in the polar region was also discovered.

Among them, the Wanxing team has published more than 60 high-level academic papers in the”Ionosphere and Upper Atmosphere” section of the top journal JGR in its field. It is the research team with the most published papers in the world and is known as”The world’s largest ionosphere group” has made pioneering contributions to the development of China’s planetary science.

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As an academic leader, he created the Key Laboratory of Earth and Planetary Physics of the Chinese Academy of Sciences, led the construction of China’s space environment comprehensive observatory chain, and presided over the construction of major scientific research platforms such as non-coherent scattering radar in Sanya.

Tianwen 1 is a comprehensive mission of orbiting patrol. It consists of three parts:orbiter, lander, and patrol. It is planned to complete three detections of surround, landing, and patrol (exploration) at the same time with one launch I hope to achieve more than one goal.

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The technical requirements are very high. So far, more than 40 explorations of Mars have been carried out by humans, most of them are orbiting or landing + patrol, and there are very few performing three tasks at the same time. -Only the United States has succeeded in the past, and the EU’s attempt ended in failure.

After the lander enters the Martian atmosphere, it adopts aerodynamic shape, parachute, reverse thrust engine and other multi-stage deceleration and landing leg cushioning. After the separation of the rover (namely the patrol device) and the landing platform, regional patrol detection will be carried out. The surround will provide relay communication links for the rover and carry out scientific exploration around.

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Tianwen 1 landing area

The orbiter will be equipped with 7 devices or include high-resolution cameras, medium-resolution cameras, underground radars, mineral spectrometers, neutral and high-energy particle analyzers and magnetic forces instrument. The rover weighs 200 kilograms and will carry six devices, or include remote sensing cameras, ground penetrating radars, multispectral cameras, laser breakdown spectrometers, and instruments to detect climate and magnetic environment.

That is to say, the most core part of scientific research focuses on magnetic field research, atmospheric thin particles, especially charged particles. This is also the core mission of most Mars exploration orbiters in the world.

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As the most professional group in China, Wanxing’s ionospheric and upper atmosphere research team deserves to be the chief scientist. It can ensure that China’s mission will not only implement space-related technologies, but also Can harvest enough scientific research results.

However, before the launch of Tianwen-1, Wan Weixing unfortunately passed away. This is a huge regret for the Chinese Mars exploration mission. 》In the article, there is a sentence like this:

“Thirty years ago we were also a generation of dream seekers. My road to life is like a piece of The sailing boat has been chasing the lighthouse that is still fuzzy though it is still in existence…”

I also hope that our new generation of young people can take on the important task and continue to move forward towards the sea of ​​stars Keep exploring!

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