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Study of acceleration processes of Earth's radiation belts particles

地球辐射带粒子加速过程研究

基本信息

批准号：
08640556
负责人：
NAGAI Tsugunobu
金额：
$ 1.28万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

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.

1.辐射带电子强度的长期变化数据库是利用1989-1998年期间“曙”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的电子的测量数据构建的。数据周期几乎涵盖一个太阳周期。外部区域内部（L=3附近）的电子强度随着太阳周期而变化。 1989-1994年电子强度较高，而太阳极小期由于很少注入槽区，电子强度较低。外带外围电子强度在1994年达到峰值，而在太阳极小期则较低。这些结果和其他结果首先是根据 Akebono 的长期连续测量得出的。该数据库对辐射带粒子加速机制的研究具有重要影响。 2．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，建立了时变磁场和电场模型。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的注入是外区加速过程的一部分。 3．地球同步电子环境预测基于原位磁场测量，以输入为指标，构建同步轨道相对论电子强度预测方案。该方案使用线性预测滤波器，可以成功预测前一天的电子通量。