Journal cover Journal topic
Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
Geosci. Instrum. Method. Data Syst., 5, 53-64, 2016
http://www.geosci-instrum-method-data-syst.net/5/53/2016/
doi:10.5194/gi-5-53-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Mar 2016
Comparison between manual scaling and Autoscala automatic scaling applied to Sodankylä Geophysical Observatory ionograms
Carl-Fredrik Enell1, Alexander Kozlovsky2, Tauno Turunen2,*, Thomas Ulich2, Sirkku Välitalo2, Carlo Scotto3, and Michael Pezzopane3 1EISCAT Scientific Association, Kiruna, Sweden
2Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
3Istituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, Italy
*retired
Abstract. This paper presents a comparison between standard ionospheric parameters manually and automatically scaled from ionograms recorded at the high-latitude Sodankylä Geophysical Observatory (SGO, ionosonde SO166, 64.1° geomagnetic latitude), located in the vicinity of the auroral oval. The study is based on 2610 ionograms recorded during the period June–December 2013. The automatic scaling was made by means of the Autoscala software. A few typical examples are shown to outline the method, and statistics are presented regarding the differences between manually and automatically scaled values of F2, F1, E and sporadic E (Es) layer parameters.

We draw the conclusions that:

1. The F2 parameters scaled by Autoscala, foF2 and M(3000)F2, are reliable.

2. F1 is identified by Autoscala in significantly fewer cases (about 50  %) than in the manual routine, but if identified the values of foF1 are reliable.

3. Autoscala frequently (30  % of the cases) detects an E layer when the manual scaling process does not. When identified by both methods, the Autoscala E-layer parameters are close to those manually scaled, foE agreeing to within 0.4  MHz.

4. Es and parameters of Es identified by Autoscala are in many cases different from those of the manual scaling. Scaling of Es at auroral latitudes is often a difficult task.


Citation: Enell, C.-F., Kozlovsky, A., Turunen, T., Ulich, T., Välitalo, S., Scotto, C., and Pezzopane, M.: Comparison between manual scaling and Autoscala automatic scaling applied to Sodankylä Geophysical Observatory ionograms, Geosci. Instrum. Method. Data Syst., 5, 53-64, doi:10.5194/gi-5-53-2016, 2016.
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Short summary
Ionograms from the Sodankylä Geophysical Observatory ionosonde (station SO166) were scaled automatically with the Autoscala software during a test period. The results were compared with manually scaled ionospheric parameters. In general, the F-layer parameters were found to agree well, whereas high-latitude phenomena like auroral E layers were often misidentified.
Ionograms from the Sodankylä Geophysical Observatory ionosonde (station SO166) were scaled...
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