Results 81 to 90 of about 1,807 (203)

Classification of Ionograms Obtained from Vertical Incidence Pulsed Ionospheric Radar (VIPIR)/Dynasonde Ionospheric Radar at Jang Bogo Station, Antarctica

Journal of Astronomy and Space Sciences
The 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, Geonhwa Jee, Hyuck-Jin Kwon, Khan-Hyuk Kim, Changsup Lee, Young-Bae Ham, Nikolay Zabotin   +6 more
doaj   +1 more source

Diagnostics of HF radio channel: based on data from backscatter ionospheric sounding by continuous chirp signal

Solar-Terrestrial Physics, 2018
Backscatter ionospheric sounding (BIS) is a powerful tool for monitoring and predicting conditions of operation of HF communication systems. The BIS method is adopted to determine coverage areas of radio waves and maximum usable radio frequencies ...
Ponomarchuk S.N., Grozov V.P., Kotovich G.V., Kurkin V.I., Penzin M.S.   +4 more
doaj   +1 more source

Techniques of Reduction of Ionograms to True Height-Electron Density Profiles [PDF]

, 1972
52-56A survey is made of techniques developed for reduction of ionograms (both bottom side and topside) to true height-electron density profiles. Emphasis is laid on the' low ionization: and ‘valley-problem with bottom side ionograms.
Saha, A.K., Jain, V C.
core  

Study of height-spread sporadic-E layers observed in the South American Magnetic Anomaly

Frontiers in Astronomy and Space Sciences
Spread echoes from the E-region observed in ionograms obtained at high latitudes are generally classified as auroral sporadic-E (Esa) layers. These layers have also been detected in nighttime ionograms collected at some ionospheric stations in the South ...
Juliano Moro, Juliano Moro, Jiyao Xu, José Valentin Bageston, Lígia Alves da Silva, Lígia Alves da Silva, Laysa Cristina Araújo Resende, Laysa Cristina Araújo Resende, Clezio Marcos De Nardin, Vânia Fátima Andrioli, Vânia Fátima Andrioli, Angela Machado Santos, Angela Machado Santos, Giorgio Arlan da Silva Picanço, Hui Li, Liu Zhengkuan, Chi Wang, Nelson Jorge Schuch   +17 more
doaj   +1 more source

Multi-quasi-parabolic ionosphere model with EF-valley

Annals of Geophysics, 2016
We improve the conventional multi-quasi-parabolic (MQP) model and develop two MQP models with EF-valley by applying the predicted EF-valley parameter of the newest version of the International Reference Ionosphere.
Jie Sun, Xiao-Juan Zhang, Shun Wang, Zhao-Qian Gong, Guang-You Fang   +4 more
doaj   +1 more source

Investigation of the possible relationship between the occurrences of atmospheric gravity waves and equatorial Spread-F. [PDF]

Heliyon, 2023
Olawepo AO, Olagunju OE, Ajani OV.
europepmc   +1 more source

Vertical electron density profiles from digisonde ionograms. The average representative profile

, 1996
Profile calculations from ionograms using the Huang-Reinisch technique arrive at a set of boundary values and coefficients that describe the profile.
Reinisch, B. W., Huang, X.
core   +3 more sources

IonoGAN: An Enhanced Model for Forecasting Quiet and Disturbed Ionospheric Features From Predicted Ionograms

Space Weather
Ionograms are radar echo graphs that depict vertical ionospheric density profiles, structures, fluctuations, and irregularities, with the F region represented by F‐trace and Spread‐F features in the graphs.
Chu Qiu, Jinhui Cai, Zheng Wang, Pengdong Gao, Guojun Wang, Quan Qi, Bo Wang, Zhengwei Cheng, Jiankui Shi, Yajun Zhu, Xiao Wang, Kai Ding   +11 more
doaj   +1 more source

Massive statistical analysis of autoscaled data: the case of the double reflection signature in mid-latitude vertical ionograms

, 2013
This work shows how new capabilities can emerge from a massive statistical analysis of previously overlooked autoscaled data. In particular, the paper shows how autoscaling methods for vertical ionograms, specifically Autoscala, can offer a new kind of ...
Scotto, C., Pezzopane, M.
core   +1 more source

Hyperpigmentation Induced by Hydroxychloroquine. [PDF]

Dermatol Pract Concept, 2023
Hamri L.
europepmc   +1 more source