By contrast, using measurements by Meira and Tisone (see, Sechrist, 1977, Fig. 6.3, p. 105) gives total burdens of 1.43 x 10 and 8.99 x 10 , respectively. D.3 DOMAIN B D.4 DOMAIN C Here this is divided into three different regions, namely the upper thermosphere, C-l, 500-1000 km where there are data from USSA, 1976, the plasmasphere, which is treated essentially as ionized atomic hydrogen corotating with the earth, and the outer magnetosphere, which consists of a very dilute plasma, mainly of ionized hydrogen. C.1 Upper Thermosphere
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