ENERGY EQUILIBRIUM IN A CORONAL MAGNETIC LOOP

Temperature distribution in the cylindrically symmetric coronal magnet ic loop, (i) with constant pressure and (ii) with the pressure varying along the radial distance, of the (a) hotter apex and (b) cooler apex than base is investigated analytically by considering the equilibrium between the heat conduction and radiation loss. If the temperature of the loop does not lie within one of the specified temperature ranges, then the distribution is calculated numerically. The effect of the in clusion of heating due to an external source is studied and found that it increases the length of the loop. On the basis of the observed phe nomenon, that the magnetic field varies along the loop, the temperatur e distribution in the loop is investigated for the loop-geometries pro posed by Antiochos and Sturrock (1976). It is concluded that for the l arger compression in the area of cross section, the height of the loop decreases. Present investigation shows that no loop with equal apex a nd base temperatures can exist, but a small variation between the two temperatures supports the existence of the loop, which can be observed in nature.