ELECTRON TEMPERATURES WITHIN MAGNETIC CLOUDS BETWEEN 2 AND 4 AU - VOYAGER 2 OBSERVATIONS

We have performed an analysis of Voyager 2 plasma electron observation s within magnetic clouds between 2 and 4 AU identified by Burlaga ann Behannon [1982]. The analysis has been confined to three of the magnet ic clouds identified by Burlaga and Behannon that had high-quality dat a. The general properties of the plasma electrons within a magnetic cl oud are that (1) the moment electron temperature anticorrelates with t he electron density within the cloud, (2) the ratio T-e/T-p tends to b e >1, and (3) on average, T-e/T-p approximate to 7.0. All three result s are consistent with previous electron observations within magnetic c louds. Detailed analyses of the core and halo populations within the m agnetic clouds show no evidence of either an anticorrelation between t he core temperature T-C and the electron density N-e or an anticorrela tion between the halo temperature T-H and the electron density. Within the magnetic clouds the halo component can contribute more than 50% o f the electron pressure. The anticorrelation of T-e relative to N-e ca n be traced to the density of the halo component relative to the densi ty of the core component. The core electrons dominate the electron den sity. When the density goes up, the halo electrons contribute less to the electron pressure, so we get a lower T-e. When the electron densit y goes down, the halo electrons contribute more to the electron pressu re, and T-e goes up. We find a relation between the electron pressure and density of the form P-e = alpha N-e(gamma) with gamma approximate to 0.5.