TGO Ramfjordmoen Ionosonde Data April 1985

About this dataset: This dataset contains ionograms in PNG format and covers data from April 01-30, 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PNG格式的电离层图，涵盖了1985年4月1日至30日的数据。关于特罗姆瑟电离层仪（1984-1992）：在1984年至1992年期间，该电离层仪位于挪威特罗姆瑟附近的拉姆福尔登，北纬69°35'，东经19°13'，由特罗姆瑟大学极光观测站操作。该仪器在1984年之前就位于此位置，并且直到2018年仍在该处运行；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。低功率发射机和互补码传输的结合使得特罗姆瑟电离层仪在当时的传统电离层仪中相当于具有20微秒脉冲和16千瓦峰值功率的设备。常规操作为每20分钟进行一次电离层图的绘制，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，确定非典型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数据减少至原始数据的不到10%。通过这种方式，一条2400英尺的磁带可容纳约1300个电离层图，相当于18天的数据。当读取磁带时，这些磁带已存有4至11年的历史，因此在转移到其他媒体的过程中导致约20%的数据损失。如今，数据存储在在线磁盘上，并拥有多种媒体形式的离线档案。