Nuclear Fusion Process in 3He-Rich Flares
Hard X-rays associated with solar flares are recently reinterpreted as a thermal emmision from very hot plasma with temperatures more than 108 K. Among 3He-rich flares, May 28, 1969 event has a very clear thermal spectrum of hard X-rays detected by the 0S0-5 satellite. The temperature of the hard X-ray emitting plasma was about 7 × 108 K, much higher temperature as compared with other ordinary flares. Therefore we propose here that a nuclear fusion process takes place within the X-ray emitting plasma itself.
Another author has proposed a nuclear hypothesis (Colgate et al.,1977), which is, however, criticized by some authors because of the unrealistic model of nuclear interaction region in the solar atmosphere. They assumed T = 2 × 109 K and ne = 3 × 1015 cm-3 within a very thin magnetic tube with a radius 70 cm and a length 2×109 cm. Radio emission calcurated by using thier parameters gives an extremely small flux as compared with actually observed radio flux. Our model, on the other hand, requires only a moderate temperature and density observed actually by hard X-rays, giving a reasonable radio flux. Such region can exist stable for several minutes during a flare. An extremely high temperature and density are not needed in our model.
KeywordsSolar Flare Solar Atmosphere Radio Flux Thermonuclear Reaction Spallation Reaction
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