Australian Space Weather Services Casey Riometer

A riometer (relative ionospheric opacity meter) (30 MHz) is an instrument used to quantify the amount of electromagnetic wave ionospheric absorption in the atmosphere.[1] As the name implies, a riometer measures the "opacity" of the ionosphere to radio noise emanating from distant stars and galaxies. In the absence of any ionospheric absorption, this radio noise, averaged over a sufficiently long period of time, forms a quiet-day curve. Increased ionization in the ionosphere will cause absorption of radio signals (both terrestrial and extraterrestrial), and a departure from the quiet-day curve. The difference between the quiet-day curve and the riometer signal is an indicator of the amount of absorption, and is measured in decibels. Riometers are generally passive radio antenna operating in the VHF radio frequency range (~30 MHz). The SWS WDC archives Riometer data obtained from Casey, Davis, Mawson and Macquarie Island in Antarctica. The first Riometer data file from Casey was obtained on 17/01/1989.

相对电离层不透明度计（riometer，30 MHz）是一种用于量化大气中电磁波电离层吸收量的仪器。[1]正如其名所示，相对电离层不透明度计测量电离层对来自遥远恒星和星系的无线电噪声的“不透明度”。在不存在任何电离层吸收的情况下，这种无线电噪声在足够长的时间内的平均值形成了一个平静日曲线。电离层中电离度的增加将导致无线电信号的吸收（包括地面和外星信号），并偏离平静日曲线。平静日曲线与相对电离层不透明度计信号之间的差异是吸收量的指示器，其测量单位为分贝。相对电离层不透明度计通常是无源无线电天线，工作在甚高频无线电频率范围（约30 MHz）。SWS WDC档案馆存档了从南极洲的Casey、Davis、Mawson和Macquarie Island获取的相对电离层不透明度计数据。Casey的第一个相对电离层不透明度计数据文件是在1989年1月17日获得的。