Results 11 to 20 of about 1,807 (203)
A Method for Automatic Inversion of Oblique Ionograms
Remote Sensing, 2022 In this study, a method is proposed to carry out automatic inversion of oblique ionograms to extract the parameters and electron density profile of the ionosphere.
Chunhua Jiang +6 more
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Extraction of ionosphere parameters in ionograms using deep learning [PDF]
E3S Web of Conferences, 2019 Based on a new developed author’s method for recognition traces of reflections from different layers of the ionosphere in ionograms, the ionosphere parameters are extracted. The method is based on the use of deep neural networks (DNN).
Mochalov Vladimir, Mochalova Anastasia
doaj +2 more sources
Oblique Ionograms Automatic Scaling Algorithm OIASA application to the ionograms recorded by Ebro observatory ionosonde [PDF]
Journal of Space Weather and Space Climate, 2018 The oblique ionograms automatic scaling algorithm (OIASA), developed at the INGV for the identification of trace of oblique ionograms, allows the determination of the maximum usable frequency (MUF) for communication between the transmitter and receiver ...
Ippolito Alessandro +3 more
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Polar lacuna on ionograms. E- or F-region processes? [PDF]
Annales Geophysicae, 1995 Lacuna on ionograms indicate conditions where the usual ionospheric reflections of vertically propagating radio waves transmitted from and subsequently received by an ionosonde are missing over a range of frequencies.
P. Stauning
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Trace Extraction and Repair of the F Layer from Pictorial Ionograms
AtmospherePublicly available ionograms are often in the form of pictures. This paper proposes a novel algorithm for extracting and repairing the F layer traces from pictorial ionograms.
Jiayi Wang +4 more
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Algorithm for high quality ionograms [PDF]
Electronics Letters, 2000 A new ionogram algorithm, which is highly successful in generating robust and sharp digital ionograms free of artefacts and processing noise, is presented. An important feature of the algorithm is the distortionless zooming capability, which allows the user to concentrate only on the desired magnetoionic components of the ionogram.
Arikan F., Salous, S., Arikan, O.
openaire +5 more sources
Can the polarization tagging of the ionogram trace deceive autoscaling methods? The Learmonth case
Annals of Geophysics, 2008 This paper focuses on the problem of invalid O/X polarization tagging of an ionogram and how this can affect ionogram autoscaling methods. To illustrate this problem, 623 ionograms recorded in March and April 2004 (days 080-105) by the digisonde 256
C. Scotto, M. Pezzopane
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Frontiers in Astronomy and Space SciencesMillions of ionograms are acquired annually to monitor the ionosphere. The accumulated data contain untapped information from a range of locations, multiple solar cycles, and various geomagnetic conditions.
Andreas Kvammen +7 more
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Automatic scaling of polar ionograms
Antarctic Science, 2011 AbstractThe Istituto Nazionale di Geosifica e Vulcanologia (INGV) software for automatic scaling of ionograms (Autoscala) was improved by introducing a system to identify D region absorption events, spread-F condition (frequency spreading in the F region), and Z-ray propagation.
Carlo Scotto, Michael Pezzopane
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, 2017 This chapter explores how the Alouette satellite’s reorientation of global data flows and mass-production of ionograms altered the natural order at the core of DRTE’s research. The satellite’s unexpected reliability demanded an automated system of data analysis.
core +3 more sources