Study of acceleration processes of Earth's radiation belts particles

1.辐射带中电子强度的长期变化利用1989 ~ 1998年阿克波诺号航天器上的辐射监测仪对能量为0.30 ~ 0.95 MeV、0.95 ~ 2.5 MeV和> ~ 2.5 MeV的电子进行测量，建立了该数据库。数据周期几乎覆盖了一个太阳周期。外区内部（L=3附近）的电子强度随太阳周期的变化而变化。1989 ~ 1994年期间电子强度较高，而在太阳极小期由于槽区注入频率较低，电子强度较低。外区外围的电子强度在1994年达到峰值，而在太阳极小期电子强度较低。这些结果和其他结果首先是基于Akebono的长期连续测量发现的。该数据库对辐射带粒子加速机理的研究具有重要意义。辐射带中电子通量变化的建模为了研究内磁层中电子通量的变化，建立了具有时变磁场和电场的模型。模拟的电子强度变化在辐射带粒子中具有代表性的特征，模型表明粒子向槽区注入是外区加速过程的一部分。地球同步电子环境的预测以输入为指标，构建了基于原位磁场测量的同步轨道相对论性电子强度预测方案。该方案采用线性预测滤波器，可以提前一天成功预测电子通量。

1.Long-term variation of the electron intensity in the radiation beltsThe data base was constructed with the measurements of electrons with energies of 0.30-0.95 MeV, 0.95-2.5 MeV, and > 2.5 MeV with Radiation Monitor on the spacecraft Akebono for the period 1989-1998. The data period covers almost one solar cycle. The electron intensity in the inner part of the outer zone (near L=3) changes in accord with the solar cycle. The electron intensity is high in 1989-1994, whereas it is low during the period of the solar minimum because of infrequent injection to the slot region. The electron intensity in the outer part of the outer zone shows its peak in 1994, whereas it is low during the period of the solar minimum. These results and others are found first on the basis of the long-term continuous measurements with Akebono. This data base provides an important impact on the study of the acceleration mechanisms in the radiation belts particles.2. Modeling of the electron flux changes in the radiation beltsThe model with the time-varying magnetic field and electric field is constructed for studying the electron flux changes in the inner magnetosphere. The simulated changes in the electron intensity have representative characteristics in the radiation belt particles, The model shows that particle injection to the slot region is part of the acceleration process in the outer zone.3. Prediction of the geosynchronous electron environmentThe prediction scheme of the relativistic electron intensity at synchronous orbit is constructed with the input as the index based on in situ magnetic field measurements. The scheme uses a linear prediction filter and it can successfully predict the electron flux one day ahead.