Comparison bet ween the observation of the particle detector inside ZY21 Satellite and the model of the radiation belt

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1 CHINESE JOURNAL OF GEOPHYSICS Vol. 50, No. 3 May, 2007,,, 2007, 50 (3) : Zou H, Chen H F, Zou J Q, et al. Comparison between the observation of the particle detector inside ZY21 Satellite and the model of the radiation belt. Chinese J. Geophys. (in Chinese), 2007, 50 (3) : , 1, 1, 1, 1, 1, 2, 2, 2 1, , AE8ΠAP8,, AE8 NOAA,( ) ( ),, 90 0,,,, (2007) P , Comparison bet ween the observation of the particle detector inside ZY21 Satellite and the model of the radiation belt ZOU Hong 1, CHEN Hong2Fei 1, ZOU Ji2Qing 1, SHI Wei2Hong 1, XIAO Zuo 1, HAO Yong2Qiang 1, WU Zhong2Xiang 2, XIANG Hong2Wen 2, ZHU Wen2Ming 2 1 Department of Geophysics, Peking University, Beijing , China 2 Chinese Academy of Space Technology, Beijing , China Abstract The observation of the particle detector inside ZY21 (CBERS21) satellite is compared with the radiation belt models (AE8ΠAP8). It is found that the measurement in SAA (Southern Atlantic Anomaly) is in accord with the predictions by the models, while the measured electron flux is much lower than the prediction by the AE8 model in the regions of southern and northern aurora belts. According to the observation of NOAA2 POES satellite, this difference is considered to be caused by the difference of the particle pitch angle distributions in SAA and the regions of the aurora belts. The particle s flux in SAA is inclined to be isotropic, while in the regions of the aurora belts it is obviously anisotropic where the particles distributed near 90 pitch angle are much larger than that distributed near 0 pitch angle. Keywords Particle detector inside ZY21, Radiation belt model, Pitch angle distribution, SAA, Auroral belt ( ) (XK ),,1975,,2003, E2mail com. cn

2 3 : (CBERS21) ,, MeV > 210 MeV 5 30 MeV MeV [1,2 ]., 780 km, 9815, min.,,, 780 km, [3 ]., [4 ]. 2 X [5,6 ]., 1958 Van Allen et al. [7 ], [8 11 ],, NASA AP8ΠAE8 [12,13 ], AP8ΠAE8 ( MeV) ( MeV). NOAA,, 850 km. MEPED, 30 kev 275 MeV NOAA AE8ΠAP8, 2, ( MeV) (5 30 MeV) AE8ΠAP8, : (1) (, ),, AE8ΠAP8, 2 mm,, MeV MeV, 5 30 MeV MeV (2) [14 ], j = NΠG, (1) j, N G, AE8Π AP8,, J J = j ( ) d, (2) 4, (2) J = 4 j = 4 NΠG. (3), MeV 2129 cm 2 sr,5 30 MeV 2155 cm 2 sr., MeV 5 30 MeV J e = 4 N e Π2. 29 = N e, J p = 4 N p Π2. 55 = N p. (3) (4) Lemaire et al. [15 ] Heynderickx et al. [16 ], AP8 AE8 30,,,, Jensen & Cain (1962) GSFC 12Π MeV AE ( )

3 680 (Chinese J. Geophys. ) MeV,, ( :3 ) MeV, 1a, AE MeV, 3, 1b, MeV, AE8., AE8,, 4133 ( cm - 2 s - 1 ), AE ( cm - 2 s - 1 )., AE ( cm - 2 s - 1 ), AE ( cm - 2 s - 1 ) ( cm - 2 s - 1 ), AE ( cm - 2 s - 1 )., AE8 20 % 2 mm,, AE MeV AP8, MeV AP ( MeV), 2 AP ( cm - 2 s - 1 ), AP ( cm - 2 s - 1 )., AP8, AE8 AP8, AE8 3 NOAA, NOAA NOAA MEPED (Medium Energy Proton and Electron Detector, ), 30, > 30 kev > 100 kev > 300 kev kev kev kev kev kev > 6900 kev,, 0 ; 0,,, ,, > 16 MeV > 35 MeV > 70 MeV > 140 MeV 311 NOAA, NOAA215 ( : 30 W 90 W ; :40 S 0 ) 90, 1 ( :,, 0 90, 90 0 ).,, 90 0,

4 3 : MeV (a) AE8 (b) Fig. 1 Comparison between the ZY MeV electron measurement (a) and the AE8 prediction (b) in Dec., MeV (a) AP8 (b) Fig. 2 Comparison between the ZY MeV proton measurement (a) and the AP8 prediction (b) in Dec., NOAA215 MEPED MeV (a) AP8 (b) Fig. 3 Comparison between the NOAA215 MEPED MeV proton measurement (a) and the AP8 prediction (b) in Dec., NOAA215MEPED 0 (a) 90 (b) > 300 kev Fig. 4 Comparison of the > 300 kev electron measurements by the MEPED 0 detector (a) and 90 detector (b) onboard NOAA215 satellite in the regions of aurora belts in Dec., 1999

5 682 (Chinese J. Geophys. ) 50 1 NOAA215 MEPED 90 Table 1 Comparison of the particle s differential flux measured in SAA by the MEPED 0 detector and 90 detector onboard NOAA215 satellite 90 (cm - 2 s - 1 sr - 1 ) 0 (cm - 2 s - 1 sr - 1 ) 90 Π0 > 30 kev > 100 kev > 300 kev kev kev kev kev kev > 6900 kev NOAA AP8, NOAA MEPED MeV AP8, 3,NOAA215 MEPED MeV 3115 ( cm - 2 s - 1 ), AP ( cm - 2 s - 1 ). NOAA,,, NOAA MEPED MeV AP8 4 NOAA MEPED,, AE8 AP8 NOAA 0 90,,,, [17 ].. NOAA 0 90,,,, AE8, 120,, (0 60 ).,,, 90,, 1000 km, 90 4 NOAA 0 90 > 300 kev 4, km, 90 5 NOAA AE8ΠAP8, km,, 90 0

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