Application of polar cap absorption events to the calibration of riometer systems
Application of polar cap absorption events to the calibration of riometer systems
复制标题
极帽吸收事件在测量仪系统校准中的应用
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
D. Detrick
中科院分区：
文献类型：
--
作者：
J. Hargreaves;D. Detrick
利用极帽吸收事件的空间均匀性来测试测热系统的性能。在成像光度计中，使用固定的转换系数从斜光束测量的等效天顶吸收对大多数光束进行了验证，并提出了修正系数。然而，来自角落光束的读数是不可靠的。推导了将宽波束天线的读数转换为真天顶值的因素。指出了天线旁瓣的重要性，并论证了由于中间层温度的影响而导致的吸收测量的上限和在最低信号电平下测热仪标定的不确定度。
The spatial uniformity of polar cap absorption events has been exploited to test the performance of riometer systems. In an imaging riometer the use of a fixed conversion factor for obtaining the equivalent zenithal absorption from that measured with an oblique beam is verified for most of the beams, and revised factors are suggested. The readings from the corner beams are found to be unreliable, however. Factors for converting the readings from a wide‐beam antenna to true zenithal values are derived. The significance of antenna sidelobes is pointed out, and the upper limits to the absorption measurement due to the temperature of the mesosphere and to uncertainty of riometer calibration at the lowest signal levels are demonstrated.