TGO Ramfjordmoen Ionosonde Data February 1986

About this dataset: This dataset contains ionograms in PNG format and covers data from February 01-28, 1986.About the Tromsø Ionosonde (1984-1992): During the period 1984-1992 the Ionosonde was situated at 69° 35' N, 19° 13' E at Ramfjordmoen near Tromsø, Norway and operated by the Auroral Observatory of the University of Tromsø. The instrument operated at this location prior to 1984, and still operates there (as of 2018); see the related publication for details. The instrument was fully digitized and based on a Hewlett Packard 21MX computer. The combination of a low power transmitter and complementary code transmission made the Tromsø ionosonde equivalent to a conventional ionosonde (at the time) with 20 µs pulses and 16 kW peak power. Routine operation was one ionogram every 20 min with a frequency sweep from 1 MHz to 12 MHz lasting between 2 and 3 min. For the 100 km altitude region the precision of determining the height of a sporadic E layer is ± 3 km. The ionograms were stored on magnetic tape. A noise discrimination routine in the computer program reduced the stored data to less than 10% of the raw data. In this way one 2400' tape held about 1300 ionograms, equivalent to 18 days' data. The tapes were 4-11 years old when they were read, resulting in around 20% data-loss during the process of transferring to other media. Today, storage is on online disk and with offline an archive on a variety of media.

关于本数据集：本数据集包含PNG格式的电离层图，涵盖了1986年2月1日至28日的数据。关于特罗姆瑟电离层仪（1984-1992年）：在1984年至1992年期间，该电离层仪位于挪威特罗姆瑟附近的拉姆福德门，纬度69°35' N，经度19°13' E，由特罗姆瑟大学极光观测站操作。该仪器在1984年之前就位于该位置，并且直至2018年仍在该地运行；详情请参阅相关出版物。该仪器在完全数字化后基于惠普21MX计算机。低功率发射器与互补码传输的结合，使得特罗姆瑟电离层仪（在当时）等同于具有20 µs脉冲和16 kW峰值功率的传统电离层仪。常规操作为每20分钟产生一张电离层图，频率扫描从1 MHz至12 MHz，持续时间为2至3分钟。对于100 km的飞行高度区域，对散乱E层高度确定的精度为±3 km。电离层图存储在磁带上。计算机程序中的噪声识别程序将存储数据减少至原始数据的不到10%。通过这种方式，一张2400英尺的磁带可以存储大约1300张电离层图，相当于18天的数据。当读取磁带时，它们已有4至11年的历史，因此在转换到其他媒体的过程中导致了大约20%的数据丢失。如今，存储介质为在线磁盘，并辅以离线存储，存放在多种媒体上。