Study of acceleration processes of Earth's radiation belts particles

1.辐射带电子强度的长期变化数据库是用Akebono号航天器上的辐射监视器在1989-1998年期间测量的能量为0.30-0.95 MeV、0.95-2.5 MeV和&gt；2.5 MeV的电子建立的。数据周期几乎覆盖了一个太阳周期。外带内侧(L=3附近)的电子强度随太阳活动周期变化。电子强度在1989-1994年间较高，而在太阳活动极小期，由于很少注入缝隙区域，电子强度较低。外区外区的电子强度在1994年达到峰值，而在太阳活动极小期处于低谷。这些结果和其他结果首先是在对Akebono的长期连续测量的基础上发现的。该数据库为辐射带粒子加速机制的研究提供了重要的依据。辐射带内电子通量变化的模拟建立了磁场和电场时变的模型，用于研究内磁层电子通量的变化。模拟得到的电子强度变化具有辐射带粒子的典型特征，模型表明粒子注入缝隙区域是外层加速过程的一部分。地球同步电子环境的预测基于现场磁场测量，以输入为指标构建了同步轨道相对论电子强度的预测方案。该方案使用线性预测滤波器，可以成功地预测提前一天的电子通量。

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.