What is the main basis of flare grading?

What is the main basis of flare grading? The size of flare area is an important index of flare radiation scale. The area when flare brightness reaches the maximum is used as the main basis of flare level internationally, and the maximum brightness of flare is described qualitatively. Next, let the celestial phenomena give you a more detailed answer!

Graded flare intensity The size of flare area is an important index of flare radiation scale. In the world, the area when the flare brightness reaches the maximum is taken as the main basis of flare level, and the maximum brightness of flare is described qualitatively. According to the Hα monochromatic light area of flare, optical flare can be divided into five grades, which are denoted by S, 1, 2, 3 and 4 respectively. Adding F, N and B after the horizontal indicates whether the maximum brightness of optical flare in Hα line is weak, normal or strong respectively. So the biggest and brightest flare is 4B, and the smallest and darkest flare is SF.

Classification standard of optical flares

The ionosphere of the earth is sensitive to the change of solar soft X-ray radiation intensity, so the soft X-ray radiation intensity of 1~8 angstrom is widely used to classify X-ray flares internationally. At present, according to the magnitude of soft X-ray peak flux observed by American GOES satellite, flares are divided into five levels: A, B, C, M and X, and the released energy increases in turn. The numerical value after each grade indicates the specific numerical value of X-ray peak flow. For example, M2 indicates that the peak flux of flare soft X-rays is 2× 10-2 W/m2.

Generally speaking, flares below class C are small flares; M-class flare is medium flare; X-class flare is a big flare.

During the Halloween solar storm from the end of 65438+1October to the beginning of165438+1October in 2003, the sun broke out a series of big flare events. Among them,165438+X28 flare that broke out on June 4th is the largest flare observed by GOES satellite.

X-ray flare classification standard

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