Results 61 to 70 of about 950 (162)
HF radio path modeling by waveguide approach
Solar-Terrestrial PhysicsWe present a scheme for modeling HF radio signal characteristics along paths of different lengths, which is based on the waveguide approach — the normal mode method.
Ponomarchuk S. N. +3 more
doaj +1 more source
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 +1 more source
Automatic interpretation of oblique sounding ionograms based on hybrid algorithms
Solar-Terrestrial PhysicsThe paper presents a method of interpreting data on oblique ionosphere sounding (OS) with a continuous chirp signal. Hybrid algorithms for automatic interpretation of ionograms by selected points with significant amplitude obtained during secondary data ...
Ponomarchuk S. N., Grozov V. P.
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A Personal Voyage Among Earth and Space Physics Disciplines
Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.Abstract I have organized my thoughts in an autobiographical way in relation to the several distinct phases of my career encompassing Earth and space physics. I discuss atmospheric and space physics topics of interest to me in an international context, and I emphasize the value of community activities and international conferences for the interchange ...
Michael J. Rycroft
wiley +1 more source
Ingestion of GNSS‐Derived‐TEC Into NeQuick 2 Model Over South America
Space Weather, Volume 23, Issue 12, December 2025.Abstract This study examines the ingestion of total electron content (TEC) data from a network of ground‐based Global Navigation Satellite System (GNSS) receivers into the NeQuick 2 model, providing a benchmark for evaluating the cost‐effectiveness of GNSS data ingestion for near‐real‐time ionospheric specification. A significant reduction in root mean
Taiwo Olusayo Osanyin +4 more
wiley +1 more source
Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.Abstract Two quasi‐orthogonal nighttime medium‐scale traveling ionospheric disturbances (MSTIDs) were observed by conjugate midlatitude all‐sky imagers in Sutherland (32.4° ${}^{\circ}$S, 20.8° ${}^{\circ}$E; magnetic latitude: ∼ ${\sim} $−40.9° ${}^{\circ}$) and Asiago (45.87° ${}^{\circ}$N, 11.53° ${}^{\circ}$E; magnetic latitude: ∼40.3° ${\sim} 40.3{
Zama T. Katamzi‐Joseph +8 more
wiley +1 more source
Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.Abstract On 10–11 May 2024, a major geomagnetic storm occurred on Earth. It significantly affected the dynamics of the Earth's atmosphere and ionosphere. Here we report the occurrence of a severe dayside negative ionospheric storm in the American/Atlantic region during the recovery phase of the 10–11 May 2024 superstorm.
E. Astafyeva +8 more
wiley +1 more source
Modeling ionograms and critical plasma frequencies with neural networks
Frontiers in Astronomy and Space SciencesIonosondes offer broad spatial coverage of the lower ionosphere, supported by a global network of affordable instruments. This motivates the exploration of new methods that exploit this geographical coverage to capture spatially dependent characteristics
Enrique L. Rojas +2 more
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Journal of Astronomy and Space SciencesThe electron density profiles produced from the ionospheric sounding system are traditionally estimated by the inversion procedure based on the image analysis of the observed ionograms. Jang Bogo Vertical Incidence Pulsed Ionospheric Radar (VIPIR) with
Junho Back +6 more
doaj +1 more source
An Automatic CADI’s Ionogram Scaling Software Tool for Large Ionograms Data Analytics [PDF]
IEEE Access, 2022 T. Venkateswara Rao +2 more
openaire +1 more source