Results 71 to 80 of about 95,608 (153)

Long‐Lived Equatorial Plasma Bubbles Persisting Into the Afternoon Over the Pacific Sector During the Recovery Phase of the April 2023 Geomagnetic Storm

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Equatorial plasma bubbles (EPBs) are typically nighttime ionospheric irregularities, and their persistence into daytime sectors remains insufficiently understood. Here, we investigate long‐lived EPB‐related plasma depletion structures over the Pacific sector during the recovery phase of the 23–25 April 2023 geomagnetic storm using Formosa ...
Hailun Ye, Wen Yi, Jianfei Wu, Bingkun Yu, Penghao Tian, Xianghui Xue, Yajun Zhu, Jianyuan Wang, Jianyong Lu, Jian Li, Chong Wang, Tingdi Chen, Xiankang Dou   +12 more
wiley   +1 more source

L-band scintillations and calibrated total electron content gradients over Brazil during the last solar maximum

Journal of Space Weather and Space Climate, 2015
This work presents a contribution to the understanding of the ionospheric triggering of L-band scintillation in the region over São Paulo state in Brazil, under high solar activity.
Cesaroni Claudio, Spogli Luca, Alfonsi Lucilla, De Franceschi Giorgiana, Ciraolo Luigi, Galera Monico Joao Francisco, Scotto Carlo, Romano Vincenzo, Aquino Marcio, Bougard Bruno   +9 more
doaj   +1 more source

Study of TEC variations using permanent stations GNSS data in relation with seismic events. Application on Samothrace earthquake of 24 May 2014

Geodesy and Cartography, 2019
This study investigates the ionospheric total electron content (TEC) variations prior to the earthquake (MW = 6.9) of 24 May 2014 in Samothraki island of north Aegean Sea in Greece. TEC estimates were analyzed using data from GNSS (GPS+Glonass) permanent
Christos Pikridas, Stylianos Bitharis, Symeon Katsougiannopoulos, Kyriaki Spanakaki, Ion-Anastasios Karolos   +4 more
doaj   +1 more source

Determination of NavIC differential code biases using GPS and NavIC observations

Geodesy and Geodynamics, 2020
Delay bias between the pseudo range code is called Differential Code Bias (DCB), this is one of the main error sources to estimate the precise Total Electron Content (TEC) in ionosphere.
K. Siva Krishna, D. Venkata Ratnam
doaj   +1 more source

Seismo‐ and Tsunami‐Traveling Ionospheric Disturbances of the 29 July 2025 M8.8 Kamchatka Earthquake Observed by CW‐HF Doppler Sounding Systems and Ionosondes in Taiwan and Japan

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Doppler frequency shifts (DFSs) recorded by continuous wave‐high frequency Doppler sounding systems and ionograms observed by five ionosondes in Taiwan and Japan are used to study three‐dimensionally seismo‐ and tsunami‐traveling ionospheric disturbances (STIDs and TTIDs) triggered by the 29 July 2025 Mw8.8 Kamchatka earthquake.
Yao‐Chun Chen, Jann‐Yenq Liu, Tien‐Chi Liu, Katsumi Hattori, Jaroslav Chum, Chieh‐Hung Chen, Wen‐Yen Chang, Bor‐Shouh Huang, Rui Song, Horng‐Yuan Yen   +9 more
wiley   +1 more source

Determination of the satellite signals time delay caused by the ionospheric influence during the year 2022 [PDF]

Tehnika, 2023
Multi-frequency GNSS satellite signals and their availability enable research in undifferentiated and uncombined models in which a single signal at each frequency is a corresponding independent observation.
Petković Dušan S., Brajović Ljiljana M., Vasilić Violeta M., Bosiočić Stanislava M.   +3 more
doaj  

HF Heating Effects as Seen From Below and Above: First Results of Joint SURA–Ionosfera‐M Experiment

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract This paper presents the first results of a coordinated experiment on the ionospheric plasma response to high‐frequency (HF) overdense heating, conducted using the SURA heating facility and the Ionosfera‐M satellite. The experiment combined ground‐based observations with in situ satellite measurements, enabling a comprehensive study of ...
A. A. Chernyshov, A. M. Padokhin, S. M. Grach, D. A. Kogogin, A. V. Shindin, S. A. Pulinets, I. A. Nasyrov, A. B. Beletsky, I. D. Tkachev, J. K. Legostaeva, D. V. Chugunin, M. A. Evdokimova, G. A. Kurbatov, K. G. Tsybulya, A. E. Solin, A. V. Shchennikov, E. V. Tareeva, V. V. Emelyanov, M. M. Mogilevsky   +18 more
wiley   +1 more source

Post‐Sunset Merging of Equatorial Ionization Anomaly Crests Into a Single Peak Over ∼35° Longitude During the 19 January 2026 Geomagnetic Superstorm

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract We investigate the nighttime equatorial ionosphere during the 19 January 2026 geomagnetic storm using Global‐scale Observations of the Limb and Disk OI 135.6 nm observations and ground‐based GPS Total Electron Content. The observations reveal a pronounced longitudinal asymmetry in the post‐sunset equatorial ionization anomaly (EIA).
Deepak K. Karan, Richard W. Eastes, Kuldeep Pandey, Wenbin Wang, Carlos R. Martinis, Robert E. Daniell, Quan Gan   +6 more
wiley   +1 more source

Long‐Term Trends in the Ionospheric Equivalent Slab Thickness as a Proxy of Climate Change in the Ionosphere

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Global warming warms the lower atmosphere, but cools and contracts the upper atmosphere. These changes also affect the ionosphere, altering the vertical distribution of plasma through changes in the plasma scale height. Here, we use ionospheric equivalent slab thickness (τ) multidecadal time series, derived through observations from co‐located
A. Pignalberi, T. Alberti
wiley   +1 more source

Empirical Assessment of Storm‐Time Thermospheric Density Inversion Methods From LEO POD Data

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Thermospheric mass density is one of the largest sources of operational uncertainty for spacecraft in low Earth orbit, particularly during geomagnetic storms. The growing population of Global Navigation Satellite System‐equipped satellites presents a data set of opportunity: precise orbit determination (POD) data streams can be used to ...
Charles Constant, Indigo Brownhall, Anasuya Aruliah, Marek Ziebart, Santosh Bhattarai   +4 more
wiley   +1 more source