SOHO SWAN COMET C/2023 P1 NISHIMURA

 Comet C/2023 P1 NISHIMURA.

SOHO/SWAN/J.P.Navarro Pina.

The Ly-α emission is the UV emission, this is more intense in comets, the water ice in the comet's nucleus evaporates as the comet approaches the Sun, the effect of solar ultraviolet radiation decomposes the molecules of water, H2O, and the released H atoms glow with ultraviolet light. According to my calculations, the rate of water production on the comet is 10^29.5 mol s, this represents a rate greater than 3,000 kg s. Possibly today, the date of perihelion has exceeded that limit of water production, reaching 4 or 5,000 kgrs s. In the attached gif, the intensity of the H atoms in the comet's coma is observed, a product of photodissociation by fluorescence. due to the interaction of UV radiation from the solar wind, much higher than 1.06 in the attached image.

SWAN obtains almost daily all-sky images of the Lyman-α distribution of interstellar hydrogen, which provides information about the solar wind, and the ultraviolet radiation, which devours it, through ionization and exchange of electrical charges, in this way, You can observe the hydrogen comas of comets, when they are bright enough, as in the case of Nishimura. Based on these images, the real water rate of the comet can be calculated and verified with that obtained by theory.