Solar activity phenomenon-solar flare?

Let's learn about solar flares from the astronomical phenomena. Solar flare is one of the most violent explosions in local areas of the solar atmosphere. It releases a lot of energy in a short time, causing instantaneous heating in local areas, emitting various electromagnetic radiation, accompanied by a sudden increase in particle radiation.

Chinese name of solar flare: solar flare mbth: solar flare abbreviation: flare occurrence place: solar chromosphere occurrence reason: the occurrence regularity caused by the sudden release of solar magnetic field energy: about 1 1 year periodic change classification: optical flare, X-ray flare, proton flares energy: equivalent to tens of billions of giant hydrogen bombs exploding at the same time.

Solar flare is one of the most violent explosion phenomena in the local area of the solar atmosphere. It releases a lot of energy in a short time, causing the local area to heat up instantly, emitting all kinds of electromagnetic radiation, accompanied by a sudden increase in particle radiation.

Because the background radiation of the solar photosphere is too strong, most flares can't be observed under white light, and the radiation enhancement is mainly in some spectral lines, among which the Hα line of hydrogen (wavelength of 6563 angstrom, color is orange red) and the H and K lines of ionized calcium (wavelength of 3968 angstrom and 3934 angstrom, respectively) are the most prominent. When these monochromatic lights are used to monitor the chromosphere of the sun, sometimes small local areas suddenly brighten in the spectral spots near the active area. In a few minutes, the brightness enhancement area quickly becomes several times or even dozens of times brighter from the original spectral spot brightness, and then slowly returns to the original spectral spot brightness within a few minutes to 1 ~ 2 hours. 1892 In July, American astronomer Haier observed the monochromatic image of solar flare for the first time. Before 1950s, solar flares were mainly observed by Hα monochromatic light and visible spectrum, which was easy to realize on the ground. Therefore, the early definition of solar flare refers to the sudden increase of brightness in the spectral spot of solar chromosphere seen by Hα monochromatic light, also known as chromosphere burst.

Comprehensive observation by various means shows that when the flare occurs, the electromagnetic radiation in almost all bands increases from γ-rays and X-rays with wavelengths shorter than 1 angstrom to radio bands with wavelengths of several kilometers, and various particle streams with energies ranging from 103 eV to 109 eV are emitted. Among them, the enhancement of electromagnetic radiation mainly occurs in short-wave radiation (X-ray and ultraviolet light) and radio band. Therefore, a more accurate definition of flare should include all the above mutations, and the enhancement of Hα radiation is only a secondary sign of flare occurrence.

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