TGO Ramfjordmoen Ionosonde Data March 1989

About this dataset: This dataset contains ionograms in PNG format and covers data from March 01-31, 1989.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PNG格式的电离层图，涵盖了1989年3月1日至31日的数据。关于特隆赫姆电离层声波仪（1984-1992）：在1984年至1992年期间，该电离层声波仪位于挪威特隆赫姆附近拉姆福尔登莫恩的69°35' N，19°13' E处，由特隆赫姆大学的极光观测站运营。该仪器在1984年之前即在此地运行，并一直持续至2018年；具体详情请参阅相关出版物。该仪器完全数字化，基于惠普21MX计算机。结合低功率发射机和互补代码传输，特隆赫姆电离层声波仪在当时相当于传统电离层声波仪，具有20微秒脉冲和16千瓦峰值功率。常规操作为每20分钟进行一次电离层图测量，频率扫描从1兆赫兹至12兆赫兹，持续时间为2至3分钟。对于100公里高度层，对稀疏E层高度的测定精度为±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英尺的磁带可以存储大约1300张电离层图，相当于18天的数据。读取时，磁带已存储4至11年，因此在转存至其他介质的过程中产生了大约20%的数据损失。如今，存储介质为在线磁盘，以及离线存储于多种介质上的档案。