TGO Ramfjordmoen Ionosonde Data August 1985

About this dataset: This dataset contains ionograms in PNG format and covers data from August 01-31, 1985.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.

关于此数据集：本数据集包含以 PNG 格式存储的离子图，涵盖 1985 年 8 月 1 日至 31 日的数据。关于特罗姆瑟电离层 sounding（1984-1992）：在 1984 年至 1992 年间，特罗姆瑟电离层 sounding 位于挪威特罗姆瑟附近拉姆福尔登的 69° 35' N，19° 13' E，由特罗姆瑟大学极光观测站运营。该仪器在 1984 年之前就位于该位置，并一直沿用至 2018 年；具体细节请参阅相关出版物。该仪器在数字化方面实现了全面升级，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 sounding 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层 sounding。常规操作为每 20 分钟进行一次离子图记录，频率扫描从 1 MHz 至 12 MHz，持续时间为 2 至 3 分钟。对于 100 公里高度区域，对稀疏 E 层高度的确定精度为 ± 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降至原始数据的 10% 以下。因此，一条 2400 英尺的磁带可存储大约 1300 张离子图，相当于 18 天的数据。读取时，磁带已使用 4-11 年，导致在转换至其他媒介的过程中大约有 20% 的数据损失。如今，数据存储在在线磁盘上，并设有离线存档，存档介质多样。