Short-Period Changes in the F Region of the Ionosphere
Short-Period Changes in the F Region of the Ionosphere
复制标题
电离层 F 区的短周期变化
作者：
G. H. Munro
几个月来，在新南威尔士州悉尼附近一直在进行无线电观测，目的是探测电离层区域的水平运动，并调查这些运动与以前在一个观测点上观测到的变化之间的关系。本系统使用三个发射机（T1、T2、T3），它们被放置在一个直角三角形的顶点上，三角形的短边大约为南北和东西，长度分别为13英里和27英里（图1）。发射机工作在相同的频率和相同的重复频率上，并且通过电源同步或脉冲触发技术进行定相，使得三个脉冲间隔约50 km。除了在正常类型的时基上，例如用于电离层观测的时基上，因此可以在单个胶片上同时记录三组回波。使用标准的35毫米胶片，以每分钟3/4英寸的胶片速度连续移动。可以在三个点中的一个或多个点进行观测，其中两个点位于距离最远的发射点（R1和R3），第三个点位于这两个点之间的中间点（R4）。
RADIO observations designed to detect horizontal movements in the ionospheric regions and to investigate the relation of these to previously observed changes occurring above a single observing point have been in progress for some months in the vicinity of Sydney, New South Wales. The present system uses three transmitters (T1, T2, T3) placed at the apexes of a right-angled triangle with its shorter sides approximately north-south and east–west and of length 13 miles and 27 miles respectively (Fig. 1). The transmitters are operated on the same frequency and with the same repetition frequency, and are so phased, by either mains synchronization or pulse triggering technique, that the three pulses are spaced about 50 km. apart on a normal type of time base such as is used for ionospheric observations, It is thus possible to record the three sets of echoes simultaneously on a single film. Standard 35-mm. film is used, moved continuously with a film speed of ¾ inch per minute. Observations can be taken at one or more of three points, two being at the most widely spaced transmitting sites (R1 and R3), and a third at a point approximately midway between these (R4).