The characteristics or the post-noon aurora observed at Antarctic Zhongshan station on June 12, 1999, were discussed and analyzed. In the condition of the magnetic activity is not large(Kp 1), for post- noon 630. 0 nm emissions, the total fluxes of sort precipitating particles were increasing from 10 : 50 UT to 13 : 35 UT and were decreasing from 13 : 35 UT to 18 : 00 UT in almost monotonous way. Away from noon, the 557. 7 nm emissions increased gradually from 10: 50 UT to 17 : 10 UT. The behaviors of the precipitat- ing particles for exciting 630. 0 nm aurora and 557. 7 nm aurora were quite different. The peak intensity of 630. 0 nm and 557. 7 nm emissions appeared at about 13: 35 UT and 15 : 40 UT respectively, the time differ- ence or two peaks is about 2 h. The energy of precipitating electrons remained fairly steady until 15 : 00 UT when it rose dramatically.
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