10.18710/NKGXYR Tromsø Geophysical Observatory UiT The Arctic University of Norway DataverseNO 2018 Earth and Environmental Sciences Physics ionogram ionodata ionosonde aurora ionosphere SUN-EARTH INTERACTIONS UiT The Arctic University of Norway The The Arctic University of Norway UiT The Arctic University of Norway The The Arctic University of Norway UiT The Arctic University of Norway Johnsen, Magnar Gulliksen Magnar Gulliksen Johnsen UiT The Arctic University of Norway Hall, Chris Chris Hall UiT The Arctic University of Norway Tromsø Geophysical Observatory, UiT The Arctic University of Norway UiT The Arctic University of Norway Tromsø Geophysical Observatory Tromsø Geophysical Observatory, UiT The Arctic University of Norway UiT The Arctic University of Norway Tromsø Geophysical Observatory 2018-11-05 2018-11-05 2022-07-04 1986-02-01/1986-02-28 ionosonde data /~uap/apuar/apuar17/PUA1713.pdf 10.18710/NKGXYR/NWLXMP 10.18710/NKGXYR/I1W6BI 17691411 2645 3280 18516886 application/zip text/plain text/plain application/zip 2.0 Creative Commons CC0 1.0 Universal Public Domain Dedication. <p>About this dataset: This dataset contains ionograms in PNG format and covers data from February 01-28, 1986.</p><p>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.</p> TGO Ionosonde Data Norway, Troms,, Ramfjordmoen, 19.216667 69.583333