Lao Cai: The appearance of the 'sun halo' at noon

At noon on August 16, many Lao Cai residents observed the phenomenon of 'Sun halo'. The time of the sun halo appears around 12:30 - 13h20. Many people took photos and recorded video clips of this amazing natural phenomenon.

Sun halo in Lao Cai at noon on August 16 - (Photo: Hong Thao)

Mr. Luu Minh Hai, deputy director of Lao Cai Meteorological and Hydrological Center said: The halo appears only in the daytime (with the sun), or at night (with the moon) in the summer and fall season. year.

The sun's halo , the moon is an optical phenomenon, due to the light of the sun or moon shining through the high-rise cloud (altitude of about 7-8km), the cloud is composed of ice crystals and sunlight. , the moon is refracted, reflections produce circles.

The defect case is a semi-circle, with the center being the sun or the moon.

The halo of the sun, the moon has 7 colors like the color of the rainbow, however the arrangement of the halo color is opposite to the rainbow. The bottom is red, followed by orange, yellow, green, blue, indigo, purple.