Results 1 to 10 of about 182 (85)

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   +3 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

Fast Ionogram Observations of Ascending Thin Layers Locally Transported from the E to F Region at Equatorial and Low Latitudes

Remote Sensing, 2022
By using fast ionogram observations, we report the first simultaneous observations of ascending ion layers at equatorial and low latitudes. The ionosonde measurements at Sanya (18.3°N, 109.6°E; dip lat. 12.2°N) and Chumphon (10.7°N, 99.4°E; dip lat.
Lianhuan Hu, Guozhu Li, Zonghua Ding, Wenjie Sun, Xiukuan Zhao, Haiyong Xie, Zhengping Zhu, Tatsuhiro Yokoyama, Jiaping Lan, Zhaoguo Huang, Baiqi Ning   +10 more
doaj   +3 more sources

Direct Observations of Large‐Scale Wave Structure and Post‐Sunset Rise of the Ionosphere in the Generation of Equatorial Spread F

Geophysical Research Letters
Large‐scale wave structure (LSWS) and the post‐sunset rise (PSSR) are two key factors in the generation of equatorial spread F (ESF). In this study, we reported continuous and direct observations of LSWS and PSSR and their effects on seeding ESF by Sanya
Qi Jiang, Jiuhou Lei, Xinan Yue, Fuqing Huang, Rong Xia, Tong Dang, Xiaoli Luan   +6 more
doaj   +2 more sources

ACCOUNTING FOR SMALL-SCALE IRREGULARITIES IN THE PROPAGATION OF SHORT RADIO WAVES IN THE HIGH-LATITUDE IONOSPHERE [PDF]

Proceedings on Engineering Sciences, 2023
In the modern world, the need for accurate knowledge of the state of the high-latitude ionosphere has increased, the modeling of which is difficult due to the presence of a large-scale structure.
Gennadiy Zhbankov , Olga Maltseva
doaj   +1 more source

On the Results of a Special Experiment on the Registration of Traveling Ionospheric Disturbances by a System of Synchronously Operating Chirp Ionosondes

Atmosphere, 2022
We present the results of observations of traveling ionospheric disturbances (TIDs) based on the data of the operation of the network of chirp oblique sounding stations of the ionosphere on 18–19 December 2019. For observations, four stations of the same
Fedor Vybornov, Olga Sheiner, Alexey Kolchev, Evgeniy Zykov, Aleksandr Chernov, Vladimir Shumaev, Aleksandr Pershin   +6 more
doaj   +1 more source

Automatic Detection and Classification of Spread‐F From Ionosonde at Hainan With Image‐Based Deep Learning Method

Space Weather, 2023
An intelligent Spread‐F image detection and classification method is presented in this paper based on an ionogram image set using deep learning models.
Zheng Wang, Meiyi Zhan, Pengdong Gao, Guojun Wang, Chu Qiu, Quan Qi, Jiankui Shi, Xiao Wang   +7 more
doaj   +1 more source

A Comparative Study on Radio Frequency Interference Suppression and foF2 Scaling for Ionograms

Remote Sensing, 2023
In this paper, we compare the performances of radio frequency interference (RFI) suppression between radio frequency interference mitigation (RFIM) and frequency-domain adaptive clutter suppression (FACS) algorithms that apply to ionograms for foF2 ...
Zhao-Yu Chen, Kai-Jun Ke, Ching-Lun Su, Hung-Shi Lin, Yu-Lei Lai, Yen Lin, Yen-Hsyang Chu   +6 more
doaj   +1 more source

Interpretation of deformed ionograms induced by vertical ground motion of seismic Rayleigh waves and infrasound in the thermosphere [PDF]

Annales Geophysicae, 2016
The vertical ground motion of seismic surface waves launches acoustic waves into the atmosphere and induces ionospheric disturbances. Disturbances due to Rayleigh waves near the short-period Airy phase appear as wavy fluctuations in the virtual height
T. Maruyama, T. Maruyama, K. Yusupov, A. Akchurin   +3 more
doaj   +1 more source

Design and application of the multi‐transmitting and multi‐receiving ionospheric detection network

IET Radar, Sonar & Navigation, 2021
To observe a large area of ionosphere with relatively dense observing points, we design and implement an experimental multi‐transmitting and multi‐receiving ionospheric detection network in China.
Hao Qi, Gang Chen, Wanlin Gong, Da Huo, Yaxian Li, Zhihua Wang   +5 more
doaj   +1 more source