Observations of the spatial structure of electron precipitation pulsations using an imaging riometer
Observations of the spatial structure of electron precipitation pulsations using an imaging riometer
复制标题
使用成像测厚仪观测电子沉淀脉动的空间结构
DOI：
10.5194/angeo-21-997-2003
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发表时间：
2003
影响因子：
1.9
通讯作者：
F. Honary
中科院分区：
文献类型：
--
作者：
A. Senior;F. Honary
电子沉淀可以由地磁脉动活动调制。这可以通过测量宇宙噪声吸收的脉动来观察。这种脉动的观测显示场线共振和粒子驱动的特征，使用成像riometer提出和能力的仪器来绘制他们的空间结构被证明。结果表明，对于所研究的事件，脉动相位的空间变化与地面磁强计的测量结果一致，而脉动振幅的空间变化可能呈现不同的结构。有人认为，这与Coroniti和Kennel（1970）提出的机制是一致的，在该机制中，人们期望磁性和吸收脉动之间存在固定的相位关系，但吸收脉动的振幅可能取决于磁脉动振幅以外的几个因素。
Electron precipitation can be modulated by geo- magnetic pulsation activity. This can be observed as pulsa- tion of cosmic noise absorption as measured by riometers. Observations of such pulsations exhibiting field-line reso- nance and particle-driven characteristics using an imaging riometer are presented and the capability of the instrument to map their spatial structure is demonstrated. It is shown that for the events studied, the spatial variation of pulsation phase as measured by the riometer agrees with that inferred from ground-based magnetometers, whereas the spatial vari- ation of pulsation amplitude may show a different structure. It is suggested that this is consistent with the mechanism proposed by Coroniti and Kennel (1970) where one would expect a fixed phase relationship between magnetic and ab- sorption pulsations, but where the amplitude of the absorp- tion pulsation can depend on several factors other than the amplitude of the magnetic pulsation.