In the year when the number of sunspots reaches a great height, what is it called?

The peak year of solar activity is in the textbook of the first year of junior high school.

Solar activity peaks in the year.

The activity of sunspots is closely related to the density of electric transport, such as the separation density. When there are many sunspots, the ionosphere is denser. Therefore, the high-frequency band of shortwave is better to use; It is easier to use the low frequency band when there is less sunspot activity.

When the sun darkens and suddenly erupts, it causes a disturbance in the ionosphere, disrupting shortwave communications.

The sun is the source of light and heat on the earth, and its every move will have a variety of effects on the earth. Since sunspots are a phenomenon of intense activity on the sun, the impact on the earth is obvious.

When there is a large group of sunspots on the sun, the compass on the earth will shake and cannot indicate the direction correctly; Pigeons, who are usually very good at recognizing directions, will get lost; Radio communications can also be severely hampered, or even abruptly interrupted for a period of time, and these anomalies will pose a great threat to the safe navigation of aircraft, ships, and satellites, as well as television faxes, and so on.

Black pants can also cause changes in the Earth's climate. More than 100 years ago, a Swiss astronomer discovered that when there are many sunspots, the earth's climate is dry and agriculture is abundant; When there are few sunspots, the climate is humid and rainy. Zhu Kezhen, a well-known scientist in China, also found out that the centuries in which sunspots were recorded more in ancient Chinese books were also the centuries in which particularly cold winters appeared in China.

Some people also counted the changes in rainfall in some areas, and found that this change is repeated every 11 years, and it is likely that it is also related to the increase or decrease in the number of sunspots.

Scientists who study ** have found that when the number of sunspots increases, there are also more sunspots on the earth. **There is a periodicity of about 11 years.

Botanists have also found that tree growth also varies with the 11-year cycle of solar activity. Trees grow faster in years with more sunspots; Years with few sunspots grow slowly.

What's even more interesting is that the change in the number of sunspots can even affect our body, and the change in the number of white blood cells in the human blood also has an 11-year cycle.

a. Flares often occur at the same time as sunspots, and have the same change cycle, so they do not fit the topic

b. Sunspots and flares are important markers of solar activity, the year of enhanced sunspot activity is the annual ridge backup of frequent flares, and the area above the area where sunspots are located is also the area with the highest frequency of flares, and the year with a large number of sunspots is called the peak year of solar activity, so it is correct

c. The change period of sunspots and flares is about 11 years, so it does not meet the theme of cherry blossoms and destroys d. The solar atmosphere is divided into three layers from the inside out: the photosphere, the chromosphere and the corona, the sunspots appear in the photosphere, and the flare appears in the chromosphere, so it does not meet the theme

Therefore, b

This is not true. The average period of solar activity is 11 years, which is closely related to the occurrence of natural disasters.

Sunspots are one of the hallmarks of solar activity. In years when sunspot activity is high, natural disasters may be more common.

Answer] B Answer Analysis] This question examines the signs of solar activity. The solar atmosphere is divided into the photosphere, the chromosphere, and the corona from the inside out. The type of solar activity in the photosphere is sunspots, and the type of solar activity in the chromosphere is flare.

The number of sunspots and the size of flares change over a period of about 11 years, and the number of sunspots is the main indicator of solar activity. This question examines the signs of solar activity. The sun is divided into photosphere, chromosphere, and corona from the inside out.

The type of solar activity in the photosphere is sunspots, and the type of solar activity in the chromosphere is flare. The number of sunspots and the size of flares change over a period of about 11 years, and the number of sunspots is the main indicator of solar activity. So choose option B for this question.

Answer: A dark spot that sometimes appears on the upper branches of the sun's photosphere, called sunspots; The flare that appears on the chromosphere is the most intense display of solar activity and can release enormous amounts of energy. Flares and sunspots appear at the same time, and have the same cycle of change, both 11 years.

C. Question analysis: Sunspots are areas where the local temperature of the surface of the solar photosphere is lower than that of the surrounding gas area, and A and D are wrong; The period of change in the number of sunspots is about 11 years, b is wrong; Sunspot activity is a sign of the strength of solar activity, c is correct.