Satellite images of the volcanic eruption in Tonga made netizens cool their hearts
Although the mainland's artificial satellite field started relatively late, but the speed of development is very fast, in just a few decades the mainland has launched up to 200 satellites, but this time the Tonga volcano has made the hearts of the big guys half cold. Originally thought that in recent years of various manned spaceflight, the mainland's space industry has reached the top, but did not expect the eruption of the Tonga volcano but let the mainland's satellites take a "prototype", because the mainland released the tonga volcano eruption satellite map is not as clear as the United States and Japan, we admit that there is indeed a gap between the united states in the satellite field (the United States already has 600 satellites), are we even compared to Japan? What is the real situation? Let's see what the professionals working on satellites have to say.
The Tonga volcano erupted and the whole country of Tonga was lost
On January 15, the volcanic eruption of Hong Aha Apayee Island in Tonga erupted, and when the eruption of a large amount of gas, water vapor and volcanic ash soared into the sky, forming a huge mushroom cloud, according to the observation of the eruption of up to 20 kilometers, according to the daily economic news report, the energy released at the time of the eruption is equivalent to 1,000 Hiroshima atomic bombs.
Such a large amount of energy released in a short period of time has triggered a chain reaction such as a tsunami, including Japan, Fiji and other countries have issued tsunami warnings. Of course, the mainland also detected tsunami fluctuations, but the impact was very small, the largest was the 20 cm tsunami wave monitored at Shipu Station in Zhejiang Province, and the tsunami wave monitored by other tide stations was less than 15 cm. Tonga, which is located in the middle of the volcano, is not so lucky, Tonga obtained the Internet through a submarine cable from Suva, Fiji, and due to the volcanic eruption, this cable was damaged, resulting in the interruption of all Internet connections in Tonga at about 6:40 p.m. local time, and the whole of Tonga lost contact with other countries.
The harm is much more than that?
Experts predict that the eruption of the volcano may have multiple eruptions in the following weeks or even months, and experts also remind local residents that they should be vigilant about tsunamis that may occur in a short period of time and try to avoid low-lying areas.
What has attracted the attention of the people on the mainland is that some media have publicized that the volcanic eruption in Tonga is likely to trigger a "summerless year", because volcanic ash erupts into the stratosphere, and the aerosol in the stratosphere will have a "parasol" effect due to the inability to settle, resulting in insufficient sunlight on the earth's surface and causing global temperature to drop. The media also cited cases of previous volcanic eruptions causing a global cooling to corroborate.
In this regard, the Beijing News published an article saying that not all levels of volcanic eruptions will produce human perceptible climate impacts, the amount of volcanic ash imported into the stratosphere by the Tonga volcanic eruption is not as good as the previous Pinatubo Volcano and Tambora Volcano, for this volcano will not have a larger eruption, we do not know, but at least the current eruption of Tonga Volcano caused by the possibility of "summerless year" requires further scientific arguments from scientists, and can not give a definite conclusion.
At present, the latest news is that the volcanic eruption led to the destruction of houses in some parts of Tonga for the first time, and the disaster was more serious in the third largest archipelago from the eruption site, some small island houses were flooded by tsunamis, due to the large amount of volcanic ash falling, the entire Water Source of Tonga was polluted, the family drinking water was facing difficulties, and the crops of the entire country were also devastated.
With 200 satellites in the sky, why is the map of the volcanic eruption of Tonga not as good as that of the United States and Japan?
The harm caused by the volcanic eruption of Tonga to the global climate cannot be conclusive for the time being, but there is one thing that can be, that is, the map of the volcanic eruption of Tonga taken by the mainland satellite that has been hotly discussed on the Internet recently is not as clear as that taken by the United States and Japan, and many netizens cannot understand that although the number of satellites on the mainland is different from the United States, it is more than Japan, why is the picture quality not as good as that of Japan?
We can first look at the volcanic eruption map taken by the satellites of Japan and the United States, and the following is the map of the eruption of the Tonga volcano taken by the Japanese meteorological satellite "Haima 8".
Below is a map of the eruption of a Volcano in Tonga taken by the National Oceanic and Atmospheric Administration's GOES West satellite:
The following is a map of the eruption of the Tonga volcano taken by the mainland wind and rain 2F and fengyun 4B, compared with the japanese and American satellites:
It is not difficult to find that the perspective of the pictures taken by the continental satellites is indeed different from that of the United States and Japan, and the clarity and angle are not as good as those of the United States and Japan. Some netizens said that the satellite technology of the mainland is not very good. But in fact, this is a very one-sided statement, because the satellite takes pictures in different ways, and the final photos are different, and the common way of drawing is true color, long-wave infrared, short-wave infrared, true color (no luminous), visible light and so on.
For example, the following is a visible infrared remote sensing image of The Tonga volcano before the eruption of the Ocean One D satellite:
The following is an infrared remote sensing image taken by the Ocean One D satellite after the eruption of The Tonga Volcano:
The following is an image of the eruption of The Tonga Volcano taken by the Wind Cloud Satellite, with a very obvious mushroom cloud.
Because different satellites have different functions, so the picture taken is not the same, in the eyes of outsiders is simple and clear and not clear, only professionals can understand the information presented in the image, even if it is not clear image, experts can get the information they want. For example, although the Fengyun-3 E star can detect the nighttime weather system, imaging is not the clear image that everyone sees.
Some netizens may say that since the technology can be, why do people in Japan and the United States have a frontal picture, while the mainland only has a side picture? In this regard, experts engaged in the satellite industry gave an explanation, netizen Lao Jia is a member of the wind four-2 star development team, he said that the wind four is a geostationary orbit meteorological satellite, there is a fixed point longitude, simply understood as the rotation and the rotation of the earth is synchronous. Its location mainly serves Chinese mainland, and it is possible that it will not be illuminated.
Netizens asked the Chinese medicine doctor without a trace, in addition to the satellite position is not at the apex of the eruption site, the time is not just passed, and there is a resolution problem of the satellite. Different satellites have different purposes and different resolutions. There are also different spectral band settings, different detection purposes, will affect the clarity. It's what tools do. China happens not to be the most suitable satellite out there.
Some netizens also explained that the clearest picture of the volcanic eruption satellite that we see is the meteorological satellite, the meteorological satellite is definitely in the country and its surroundings, and the distance from the mainland to Tonga is four to five times that of the United States from Tonga, and more than twice that of Japan, so the image angle of the United States and Japan is better, and the mainland is the side angle.
The satellite technology of the mainland is definitely the first echelon, for example, you can go to the Changguang satellite platform to see, it is a civilian version of the Earth remote sensing image system, and the clarity can be much stronger than that of the United States and Japan.