TGO Ramfjordmoen Ionosonde Data January 1986

About this dataset: This dataset contains ionograms in PNG format and covers data from January 01-31, 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1月1日至31日的数据。关于特罗姆瑟电离仪（1984-1992年）：在1984至1992年期间，该电离仪位于挪威特罗姆瑟附近拉姆福尔登的69°35'N，19°13'E，由特罗姆瑟大学的地磁观测站运营。该仪器在此地点的运营始于1984年之前，并且截至2018年仍在那里运行；有关详细信息，请参阅相关出版物。该仪器基于惠普21MX计算机完全数字化。低功率发射机和互补码传输的结合使得特罗姆瑟电离仪（在当时）等同于具有20微秒脉冲和16千瓦峰值功率的传统电离仪。常规操作为每20分钟进行一次电离层图绘制，频率扫描从1兆赫兹到12兆赫兹，持续时间为2至3分钟。对于100公里高度区域，确定杂波E层高度的精度为±3公里。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的数据减少到原始数据的不到10%。因此，一根2400英尺的磁带可以存储大约1300个电离层图，相当于18天的数据。当读取时，磁带已存储4至11年，导致在转移到其他媒体的过程中大约有20%的数据丢失。如今，存储介质为在线磁盘，以及离线存储在多种媒体上的档案。