TGO Ramfjordmoen Ionosonde Data March 1986

About this dataset: This dataset contains ionograms in PNG format and covers data from March 01-31, 1986.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，并涵盖1986年3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年期间，该电离层 sounding 位于挪威特罗姆瑟附近的拉姆福尔登莫恩，纬度69°35' N，经度19°13' E，由特罗姆瑟大学的极光观测站运营。该仪器在此地点运营时间早于1984年，且直至2018年仍在该处运行；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 sounding 在当时相当于传统的电离层 sounding，拥有20微秒的脉冲和16千瓦的峰值功率。常规操作为每20分钟记录一张电离层图，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%。以此方式，一张2400英尺的磁带可存储约1300张电离层图，相当于18天的数据。当读取磁带时，其年龄在4至11年之间，导致在数据迁移至其他介质的过程中约有20%的数据丢失。如今，数据存储在在线磁盘上，并在离线状态下存档于多种介质中。