第7卷‧第4期,
197904
, pp. 357-364
磁暴時期磁層下墜電子之研究
- 作者：
林崇安
- 作者服務機構：
國立中央大學地球物理研究所
- 中文摘要：
磁暴時期，磁層電子沿著磁力線下墜至電離層，而與大氣粒子產生複雜之作用。本文先以電子分佈函數配合波子曼方程式建立起理論模式，而後應用至實際人造衛星及火箭之觀測上。本研究中得知，在離地面三千公里高處，有靜電不穩定波之形成，而在二百公里高處，則以電漿碰撞作用為主。在磁層之爆炸相時，高速高密度之下墜電子，使不穩定波之滋長率增大，並使邊際點下移，形成分立極光及DP電流系統，同時使中性粒子游離率及光譜放射率在一二百公里處增大。而在一般時期下墜之低速低密度電子，則形成擴散極光及DP電流系統等。以上推論皆符合一般之觀測結果。
- 英文摘要：
During magnetic storms，magnetosphericelectrons preeipitate into the ionosphere alongthe magnetic field lines and interact with theatmospheric partieles. Given the distributiorfunctions of the system, a theoretical model isestablished, based on tlie Boltzmann equation,and is applied to the measurements of satellitesand rockets. It is shown that the electrostaticunstable wave will grow at altitude 3000 km,and the collision effect will dominate overinstabilities at altitude 200km. During the expansion phase of a magenetospheric substorm, the precipitating electrons with high drift velocity and density will increase the growth rate of the unstable wave, therefore, the auroralmarginal upper point will shift downward and the ionization arte of the neutral particles and the optical emission rate will increase at altitude100-200 km. Meanwhile, Discrete aurora and DP current systems are forming. The regularprecipitating electrons with low drift velocityand density will generate diffuse aurora and DP current systems. Theses results are in goodagreement with observation.
- 中文關鍵字：
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- 英文關鍵字：
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