Results 11 to 20 of about 5,624 (239)

Sporadic E Layer with a Structure of Double Cusp in the Vertical Sounding Ionogram

Atmosphere, 2021
In this study, we analyzed a large number of vertical sounding ionograms, obtained by the mid-latitude Cyclone ionosonde (55.85° N; 48.8° E) of Kazan (Volga Region) Federal University, which operates in a rapid-run mode of ionograms (1 ionogram per ...
Kamil M. Yusupov, Nataliya V. Bakhmetieva   +1 more
doaj   +2 more sources

Automatic classification of spread‐F types in ionogram images using support vector machine and convolutional neural network

Earth, Planets and Space
An ionogram image serves as a valuable data for examining the ionospheric bottom side characteristics and variabilities. Spread-F is indicated or identified by plasma irregularity in the ionospheric region.
Phongsachot Benchawattananon, Apirat Siritaratiwat, Pornchai Supnithi, Michi Nishioka, Septi Perwitasari, Puripong Suthisopapan, Anan Kruesubthaworn   +6 more
doaj   +2 more sources

A Deep Learning Approach for Automatic Ionogram Parameters Recognition With Convolutional Neural Networks

Earth and Space Science
Typical ionosondes operate with >5 min time intervals, which is enough to obtain regular parameters of the ionosphere, but insufficient to observe short‐term processes in the Earth's ionosphere.
Ruslan Sherstyukov, Samson Moges, Alexander Kozlovsky, Thomas Ulich   +3 more
doaj   +2 more sources

Modeling z-shaped disturbance along the Pedersen ray of oblique sounding ionogram using adaptation of IRI to experimental data

Solar-Terrestrial Physics, 2016
We present the results of numerical modeling of a traveling ionospheric disturbance that causes z-shaped bends at the Pedersen ray of oblique incidence ionograms.
Kim A.G., Ponomarchuk S.N., Kotovich G.V., Romanova E.B.   +3 more
doaj   +2 more sources

An Automatic CADI’s Ionogram Scaling Software Tool for Large Ionograms Data Analytics [PDF]

IEEE Access, 2022
Scale the ionosonde ionograms to produce accurate readings is a professional manual scaling technique. However, there is a high demand for auto-scaling software that can manage a large number of ionograms in order to avoid the time and effort involved in
T. Venkateswara Rao, M. Sridhar, D. Venkata Ratnam   +2 more
openaire   +2 more sources

A new inversion algorithm for backscatter ionogram and its experimental validation [PDF]

Annales Geophysicae, 2014
Oblique backscatter sounding is a powerful tool for detecting and monitoring the ionosphere continuously at a remote distance. High-frequency (HF) backscatter ionograms provide the amplitudes of backscatter signals with respect to group path or time ...
J. J. Zhao, C. Zhou, G. B. Yang, C. H. Jiang, S. S. Chang, P. Zhu, X. D. Gu, B. B. Ni, Z. Y. Zhao   +8 more
doaj   +2 more sources

Topside Ionogram Scaler With True Height Algorithm (TOPIST): Automated processing of ISIS topside ionograms [PDF]

Radio Science, 2004
The United States/Canadian ISIS‐1 and ISIS‐2 satellites collected several million topside ionograms in the 1960s and 1970s with a multinational network of ground stations that provided good global coverage. However, processing of these ionograms into electron density profiles required time‐consuming manual scaling of the traces from the analog ...
Dieter Bilitza, Xueqin Huang, Bodo W. Reinisch, Robert F. Benson, H. Kent Hills, William B. Schar   +5 more
semanticscholar   +3 more sources

Satellite Traces: Ionogram Signatures of Bottom‐Side Upwelling Structures ‐ A Simulation Study

Geophysical Research Letters
Satellite Traces (STs) are the important ionogram signatures for the presence of upwellings in the bottom‐side ionosphere, which provide the necessary seed perturbation for the development of equatorial plasma bubbles (EPBs).
M. Ankita, S. Tulasi Ram, T. Yokoyama, R. T. Tsunoda, A. P. Dimri, S. Mondal, Chinmaya Nayak   +6 more
doaj   +2 more sources

Clinical Presentation and Treatment of Hyperemesis Gravidarum in a Lady Carrying Twins in the First Trimester: A Case Reports. [PDF]

Clin Case Rep
ABSTRACT We report a 12‐week‐old pauci‐geste carrying twins who experienced potentially fatal hyperemesis gravidarum. Clinical and paraclinical investigations revealed severe hypovolemic shock/dehydration, ionic disruption, undernutrition, and acute renal failure (GFR: 36.8 mL/min/1.73 m2 according to modified MDRD). The patient spent almost 3 weeks in
Banyanga David K, Walemba CM, Ndamuso Nshombo V, Burume M, Agath BR, Kasongo L, Matabaro GM, Masimango G, Alangi TO, Matabishi P, Mijiriro PW.   +10 more
europepmc   +2 more sources

Genetic Insights and Lifelong Management of Aldosterone Synthase Deficiency: A Case of Hyperreninemic Hypoaldosteronism. [PDF]

Clin Case Rep
ABSTRACT Aldosterone synthase deficiency is a rare cause of neonatal salt‐wasting and failure to thrive. Routine newborn electrolyte screening after 5 days of life is vital for early detection and prevention of life‐threatening crises. Genetic confirmation enables targeted fludrocortisone therapy, ensuring favorable growth and developmental outcomes.
Ahmed MMH, Waris R, Batool S, Omarzai RG, Rehman A.   +4 more
europepmc   +2 more sources