Fig. 1. Distribution of stars. (a) All-sky image of YRS; (b) star map in Stellarium

Fig. 2. Visual motion track of stars and diagram of calculating stellar coordinates. (a) 24 h visual motion track of Vega; (b) diagram of calculating stellar coordinate in all-sky image

Fig. 3. Stellar neighborhood

Fig. 4. Scatter plot of six stars data

Fig. 5. An event of DMSP F-16 satellite crossing all-sky field of view from 11:03:33 UT to 11:07:34 UT on December 2, 2005. (a) Trajectory of DMSP satellite projected onto all-sky images; (b) electron spectroscopy; (c) Keogram; (d) energy flux of precipitating electrons; (e) average energy of precipitating electrons; (f) auroral emission intensity

Fig. 6. An event of DMSP F-16 satellite crossing all-sky field of view from 10:49:50 UT to 10:52:20 UT on December 19, 2005. (a) Trajectory of DMSP satellite projected onto all-sky images; (b) electron spectroscopy; (c) Keogram; (d) energy flux of precipitating electrons; (e) average energy of precipitating electrons; (f) auroral emission intensity

Table 1. Diurnal variation of zenith angle of stars in December 22, 2003

Table 2. Number of star spots detected in 2003 and 2005

Table 3. Average radiation intensity of each star in 2003 and average detector output signal value in 2005

Table 4. Differences of stellar radiation intensity in 2003 and 2005