The coronal structure of active regions

A four-parameter model which assumes a Gaussian dependence of both temperature and pressure on distance from center is used to fit the compact part of coronal active regions as observed in X-ray photographs from a rocket experiment. The four parameters are the maximum temperature Tsub(M), the maximum pressure Psub(M)=2Nsub(M)kTsub(M), the width of the pressure distribution sigmasub(P), and the width of the temperature distribution sigmasub(T)=αsup(1/2)sigmasub(P). The maximum temperature Tsub(M) ranges from 2.2 to 2.8x106K, and the maximum density Nsub(M) from 2 to 9x109cm-3. The range of sigmasub(P) is from 2 to 4x109 cm and that of α from 2 to 7. (Auth.)