A study of the Bremsstrahlung of plasma at about 1 A.U. in times of quiet sun and flare activity

In space plasma, especially in the interior of plasma with weak magnetic field, Bremsstrahlung is the main mechanism of loss of the plasma energy. As shown by our calculations of the Bremsstrahlung of plasma at 1 A.U. in times of quiet sun and flare activity, the variation of intensity of plasma radiation If is directly related to the frequency of the electromagnetic wave. When the frequency f is close to that of plasma fpe, the intensity of radiation is greatly enhanced. With increasing frequency, the enhancement of the radiation intensity with frequency exhibits a slow logarithmic decrease. The brightness temperature Tb is directly proportional to the electron temperature of plasma Te and to the optical depth of medium. The overall tendencies of variations of Tb and If with frequency are identical. For the same frequency, the values of If and Tb are lower in time of quiet sun than in time of flare activity.