Study On The Condition Of γ-Ray Emission In Solar Flare

The sun is the nearest star from our planet, and is the only star and the only energy base in the solar system. For human being, the shining sun is the most important objects in the universe. However, the sun is taken as one of ordinary stars, so we can get its internal structure and mechanism of energy according to the mass, radius, luminosity and spectral. According to the glare of the sun, we can observe the details of sun's surface, and measure the tiny luminosity variability, and seek some important information. So that we can calculate the physical state of the activity object on the surface, such as black spots, prominence, flares accounts and so on. The various solar phenomenon, either directly or indirectly, transmit and emission to earth through the medium wave radiation and high energy particles.In this paper, we give a brief introduction of the basic structure of the sun, and the various phenomena in the solar radiation. The second part is mainly in the theoretical foundation of high-energy gamma-ray theory produced in the radiation course. In the third part, we have discussed the condition of producing the high-energyγ-ray under the solar flare atmosphere. And the process of X andγradiation as well as neutrons produced by the interaction of accelerated charged particles with nuclei of the ambient medium of the solar atmosphere is also discussed. In the following, we have analyzed the several mechanism ofγ-ray production, including nuclear de-excitation, neutron capture, positron annihilation and the decay of neutral. At the same time, we have also considered the impulsive emission and gradual emission during the solar flares, and then analyzed the two models, the trapping of highly energetic particles and the prolonged acceleration of particles, of prolongedγ-ray emission. In the finally, three possible particle acceleration models are given, and the acceleration model of solar flares are discussed in details. The results show that: 1) for proton, the random acceleration mechanism should be considered at first; 2) for electron, the random acceleration can be used as 10MeV below, the electronic direct acceleration field is preferred above 10MeV; 3) some solar flare accounts for the two-stage accelerated mechanism of the excited wave. In the summary, we give a discussion for the present understanding of the flare phenomenon, and indicate thatγ-ray emission during solar flares is not a unique property characterizing the largest flares event.By the analysis results of simulation data from Yangbajing ARGO experiment, we obtains the effective area of ARGO experiment and angular resolution to Gamma ray from different energy, and at last we give the forecast of solar flare observation with this experiment.