Results 41 to 50 of about 993 (181)

Doppler vertical sounding of the ionosphere at the Akademik Vernadsky station

Український антарктичний журнал, 2020
The paper aims at providing the technical information about Doppler vertical sounding of the ionosphere that started at the Ukrainian Antarctic Akademik Vernadsky station since 2017; developing the technique for processing and visualization of data of ...
A. Zalizovski, O. Koloskov, A. Kashcheyev, S. Kashcheyev, Y. Yampolski, O. Charkina   +5 more
doaj   +1 more source

New Observations of Cosmic Noise Absorption in the South American Magnetic Anomaly (SAMA) Using a Next‐Generation Riometer

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study reports the first observations of cosmic noise power (CNP) and cosmic noise absorption (CNA) obtained with a next‐generation riometer installed at the Southern Space Observatory (SSO/INPE) in Brazil, located within the South American Magnetic Anomaly (SAMA).
J. Moro, E. Correia, C. M. Wrasse, J. R. Costa, J. V. Bageston, C. M. Denardini, A. J. Valcorte, L. C. A. Resende, A. M. Santos, L. A. da Silva, J. P. Marchezi, T. S. Trondsen   +11 more
wiley   +1 more source

Characteristics of Post‐Sunset Equatorial Plasma Bubble Occurrences Over Indonesia During a Geomagnetic Storm in August 2024

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract We investigated characteristics of post‐sunset equatorial plasma bubbles (EPBs) generated over Indonesia during a geomagnetic storm on 12 August 2024 using Global Navigation Satellite System and ionosonde data. During the August geomagnetic storm, EPBs were generated after sunset over the eastern part of Indonesia (∼120°–130°E) but not over ...
Takuya Sori, Prayitno Abadi, Ihsan Naufal Muafiry, Teguh Nugraha Pratama, Sri Ekawati, Dyah Rahayu Martiningrum, Noersomadi, Edy Maryadi, Febrylian Fahmi Chabibi, Michi Nishioka, Septi Perwitasari, Mamoru Yamamoto   +11 more
wiley   +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

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

IEEE Access, 2022
T. Venkateswara Rao, Miriyala Sridhar, Devanaboyina Venkata Ratnam   +2 more
openaire   +1 more source

IRI-2012 MODEL ADAPTABILITY ESTIMATION FOR AUTOMATED PROCESSING OF VERTICAL SOUNDING IONOGRAMS [PDF]

Научно-технический вестник информационных технологий, механики и оптики, 2014
The paper deals with possibility of IRI-2012 global empirical model applying to the vertical sounding of the ionosphere semiautomatic data processing.
V. D. Nikolaeva , M. V. Rybakov, A. L. Kotikov, V. K. Koshelevsky   +3 more
doaj  

Numerical simulation of the propagation of electromagnetic waves in ionospheric irregularities

Earth and Planetary Physics, 2020
The characteristics of high-frequency (HF) electromagnetic (EM) wave propagation can be affected when EM waves propagate in the ionosphere. When ionospheric irregularities appear in the ionosphere, they can have a serious impact on the propagation of HF ...
ChunHua Jiang, LeHui Wei, GuoBin Yang, Chen Zhou, ZhengYu Zhao   +4 more
doaj   +1 more source

Some aspects of large-scale travelling ionospheric disturbances which originate at conjugate locations in auroral zones, cross the equator and sometimes encircle the earth [PDF]

Annales Geophysicae, 2011
The occurrence of large-scale travelling ionospheric disturbances (LS-TIDs) has been examined. Initially some literature on their generation is considered.
G. G. Bowman, I. K. Mortimer
doaj   +1 more source

Signature of Y-forking in ionogram traces observed at low-mid latitude Indian station, New Delhi, during the earthquake events of 2020: ionosonde observations

Frontiers in Astronomy and Space Sciences, 2023
We have examined ionospheric response to eleven earthquake events measuring less than four on the Richter scale during the year 2020 that occurred in the vicinity of New Delhi (28.6°N, 77.2°E, 42.4°N dip).
Arti Bhardwaj, Arti Bhardwaj, Ankit Gupta, Ankit Gupta, Qadeer Ahmed, Qadeer Ahmed, Anshul Singh, Anshul Singh, Sumedha Gupta, S. Sarkhel, M. V. Sunil Krishna, Duggirala Pallamraju, Tarun Pant, A. K. Upadhayaya   +13 more
doaj   +1 more source

How the 29 July 2025 M8.8 Kamchatka Earthquake Shook the Ionosphere Over Japan

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract This study investigates the mid‐field (∼1,100–3,800 km) ionospheric response to the 29 July 2025 Kamchatka earthquake over Japan using multi‐instrument observations, raytracing, and numerical simulations. Total electron content (TEC) observations from GPS satellite G04 and Galileo satellite E10 show a maximum TEC perturbation of ∼0.5–0.85 TECU
R. K. Barad, E. Astafyeva, S. A. Sanchez, E. A. Kherani, I. D. Ouar, C. Maréchal   +5 more
wiley   +1 more source