Eastward propagation of PC4‐5 range CNA pulsations in the morning sector observed with scanning narrow beam riometer at L=6.1
Eastward propagation of PC4‐5 range CNA pulsations in the morning sector observed with scanning narrow beam riometer at L=6.1
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在 L=6.1 处用扫描窄束测速仪观察到的早间 PC4-5 范围 CNA 脉动向东传播
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发表时间：
1988
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通讯作者：
N. Sato
中科院分区：
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作者：
T. Kikuchi;H. Yamagishi;N. Sato
在南极洲Syowa站（L = 6.1）用空间分辨率为10 km的扫描束辐射计观测到一种新型的宇宙噪声吸收（CNA）脉动。这类CNA脉动的方位波长短（80- 600 km），对应的方位m数大（20- 180）。在5 - 10 MLT的晨区，大多数周期为1 - 10 min的CNA脉动以200 m/s-3 km/s的速度向东传播。向东传播的方向与Olson等人（1980）报道的具有小m数的CNA脉动的方向相反。脉动周期趋于增加，而传播速度随着当地时间的增加而减小。这些结果表明，这种新型的CNA脉动源首先出现在夜侧磁层，并向正午移动。指出这种新的CNA脉动的发现是由于扫描测微器系统的高空间分辨率（10 km）和窄天线波束（13/sup 0/）。版权所有美国地球物理联合会1988年
A new type of cosmic noise absorption (CNA) pulsation is observed with a scanning beam riometer with a spatial resolution of 10 km, at Syowa station, Antarctica (L = 6.1). This type of CNA pulsation has a short azimuthal wavelength (80--600 km), correspnding to a large azimuthal m-number (20--180). Most CNA pulsations with a period of 1 to 10 min propagate eastward at a speed of 200 m/s to 3 km/s in the morning sector (5--10 MLT). The eastward propagation direction is opposite to that of CNA pulsations with a small m-number as reported by Olson et al. (1980). The pulsation period tends to increase, while the propagation speed decreases with increasing local time. These results suggest that the source of this new type of CNA pulsation first appears in the nightside magnetosphere and moves toward noon. It is pointed out that the finding of this new CNA pulsation is due to the high spatial resolution (10 km) and narrow antenna beam (13/sup 0/) of the scanning riometer system. copyright American Geophysical Union 1988