TGO Ramfjordmoen Ionosonde Data April 1992

About this dataset: This dataset contains ionograms in PNG format and covers data from April 01-30, 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，覆盖了 1992 年 4 月 1 日至 30 日间的数据。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拉姆福德门，北纬 69° 35'，东经 19° 13'，并由特罗姆瑟大学的极光观测站运营。该仪器在此地运营时间早于 1984 年，并且截至 2018 年仍在该地运行；有关详细信息，请参阅相关出版物。该仪器在数字化方面得到全面升级，并基于惠普 21MX 计算机。低功率发射机和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传统的电离层探测仪，具有 20 微秒脉冲和 16 千瓦峰值功率。常规操作为每 20 分钟进行一次离子图绘制，频率范围为 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，确定稀疏 E 层高度的精度为 ± 3 公里。离子图存储在磁带上。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 10% 以下。通过这种方式，一条 2400 英尺的磁带可容纳约 1300 张离子图，相当于 18 天的数据。当读取磁带时，这些磁带已存续 4-11 年，因此在转移到其他媒体的转换过程中导致了大约 20% 的数据损失。如今，数据存储在在线磁盘上，并具有离线存档，存档在多种媒体上。