Implications of statistics of near-range Doppler velocity observed with the Syowa East HF radar
Implications of statistics of near-range Doppler velocity observed with the Syowa East HF radar
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用昭和东高频雷达观测到的近程多普勒速度统计的意义
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Yukimatu
中科院分区：
文献类型：
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作者：
T. Ogawa;N. Nishitani;N. Sato;H. Yamagishi;A. Yukimatu
分析了1997年2月至12月南极昭和东端高频雷达观测到的大量视距多普勒速度资料，讨论了180-1200 km范围内多普勒速度（VD）的统计特征及其意义。昭和站观测期间的K指数在0和7之间，最大发生率为K = 1。在180-225 km范围内，平均V0 ha：，m1111 mum约为100 m/s。随着射程的增加，1 t单调增加，在400-500 km处达到最大值300-350 m/s，在700 km左右逐渐减小，达到250-300 m/s，而agam则在更远的距离缓慢增加。VD和距离的这些值根据当地时间和雷达波束方向而变化。根据对大气层等离子体111稳定性的最新认识，我们认为VD 1的这种距离像主要是由组合效应艾德引起的。电离层等离子体波的高度相关相速度、E区电子密度增强引起的HF波折射和纬度相关电场。我们认为，180-225公里范围内的低ViJ（IOOm/s）可能部分来自中性风和/或中性大气的湍流。
A large data-set of line-of-sight Doppler velocity obtained with the Antarctic Syowa East HF radar from February to December 1997 is analyzed to discuss the statl:,t1cal charactenst1cs of Doppler velocity (VD) at ranges of 180-1200 km and their implications. Syowa Station K-indices dunng the observation period were between O and 7 with a maximum occurrence at K = 1. On average V0 ha:, a m1111mum of about 100 m/s at 180-225 km ranges. With mcreasing range 1t increases monotoni cally to attain a maximum of 300-350 m/s at 400-500 km, decreases gradually to reach 250-300 m/s at about 700 km, and agam increases slowly at farther ranges. These values of VD and the range vary depending on both local time and radar beam direction. In the hght of recent knowledge of plasma 111stab1ht1es m the 10nosphere we :.ugge:.t that such range profile of VD 1s mainly cau:.ed by the combmed effect:. of altitude dependent phase velocities of ionospheric plasma waves, HF wave refraction due to enhanced E region electron density, and latitude-dependent electnc field. We mfer that the low ViJ (IOOm/s) at ranges of 180-225 km may onginate in part from neutral winds and/or turbulence of the neutral atmosphere.