TGO Ramfjordmoen Ionosonde Data January 1992

About this dataset: This dataset contains ionograms in PNG format and covers data from January 01-31, 1992.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：本数据集包含以 PNG 格式存储的离子图像，覆盖了 1992 年 1 月 1 日至 31 日的数据。关于特罗姆瑟电离层探测仪（1984-1992）：在 1984-1992 年期间，该电离层探测仪位于挪威特罗姆瑟附近的拉姆福约德门，地理坐标为北纬 69° 35'，东经 19° 13'，由特罗姆瑟大学的极光观测站操作。该仪器在此地之前的 1984 年以前就已运行，并且直到 2018 年仍在该地运行；具体详情请参阅相关出版物。该仪器在数字化过程中完全基于惠普 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探测仪在当时等同于常规电离层探测仪，具有 20 微秒的脉冲和 16 千瓦的峰值功率。常规操作为每 20 分钟进行一次离子图像采集，频率扫描范围从 1 兆赫兹至 12 兆赫兹，持续时间为 2 至 3 分钟。对于 100 公里高度区域，确定散乱 E 层高度的精度为 ± 3 公里。离子图像存储在磁带上。计算机程序中的噪声识别程序将存储数据降低至原始数据的不到 10%。通过这种方式，一张 2400 英尺的磁带可以存储约 1300 张离子图像，相当于 18 天的数据。当读取磁带时，它们已经存档了 4 至 11 年，因此在数据转移到其他媒体的过程中导致约 20% 的数据丢失。如今，存储介质为在线磁盘，以及离线存档，包括多种媒体。