TGO Ramfjordmoen Ionosonde Data January 1987

About this dataset: This dataset contains ionograms in PNG format and covers data from January 01-31, 1987.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：该数据集包含 PNG 格式的电离层图，并涵盖 1987 年 1 月 1 日至 31 日期间的数据。关于特罗姆瑟电离层仪（1984-1992）：在 1984-1992 年间，特罗姆瑟电离层仪位于挪威特罗姆瑟市 69° 35' N，19° 13' E 的 Ramfjordmoen，由特罗姆瑟大学的极光观测站运营。该仪器在此地之前（1984 年之前）就已运行，并且直至 2018 年仍在该地运行；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，完全实现数字化。低功率发射机和互补码传输的结合，使得特罗姆瑟电离层仪在当时等同于具有 20 µs 脉冲和 16 kW 峰值的传统电离层仪。常规操作为每 20 分钟生成一张电离层图，频率范围为 1 MHz 至 12 MHz，持续时间为 2 至 3 分钟。对于 100 公里高度区域，确定散发现象 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鉴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，磁带已存储 4-11 年，因此在转换到其他媒体的过程中，数据损失约为 20%。如今，数据存储于在线磁盘，并在离线状态下存档于多种媒体上。