Several observations of low-energy protons and electrons in the Earth's magnetosphere with OGO 3

i e s i n t h e l a t e evening sector of the e a r t h ' s magnetic t a i l a r e (a) approximately equal proton (190 eV --< E < 48 keV) and e l e c t r z n (17Q PTT --6 E 4 46 keV) energy d e n s i t i e s , -10 erg( a t ~) -~ each, (b) approximately equal proton and e l e c t r o n