If there is only night on the earth and there is no day, what will be the impact?

If there is no magnetic field on the earth, the biggest change of life is that without life, human beings will become extinct. The magnetic field resists the solar wind, which is an important reason why the earth can retain the atmosphere. Without a magnetic field, the atmosphere would be destroyed.

The earth's magnetic field is formed by the flow of molten iron and nickel outside the iron core in the core area, which can deflect charged particles. The solar wind is wrapped in a large number of charged particles. If there is no magnetic field, charged particles will interact violently with the earth's atmosphere, ionize a lot of gas and evaporate the surface water, and the earth environment is no longer suitable for human survival. Mars is thought to have had a lot of flowing water, but due to the gradual cessation of core activities, the magnetic field disappeared, the atmosphere was stripped by the solar wind, and a lot of water evaporated. It can no longer retain the heat of sunlight, so the temperature may become very low at night, and the temperature is higher during the day because the sunlight shines directly on the ground.

Magnetic field also plays an important role in life on earth. Many animals may rely on magnetic fields to tell their directions, such as birds and whales. Without the magnetic field, their activities will be affected, and a large number of organisms will be extinct, which will bring about the deterioration of the global ecosystem. The earth's magnetic field extends far away from the earth, protecting the whole earth environment. If the magnetic field disappears, the electronic equipment and satellite communication equipment made by human beings can no longer work normally. When the sun shines, it has some influence on satellites in earth orbit.

However, for life on earth, the most important thing may be liquid water. Life on earth can't live without water. The magnetic field disappears, the atmosphere is stripped off, liquid water evaporates in large quantities, and global life disappears.

If there is no geomagnetic field, the powerful charged particle stream from the sun (usually called solar wind) will not be deflected by the geomagnetic field and directly hit the earth. Under the bombardment of high-energy particles, the atmospheric composition of the earth may not be what it is now, and life will not exist. Therefore, the "protective umbrella" of geomagnetic field is very important to us.