Results 61 to 70 of about 447,486 (188)

Analyzing the Influence of Saint Patrick’s Day Geomagnetic Storm on the Maximum Usable Frequency (MUF) in the Brazilian Equatorial and Low-Latitude Ionosphere

Atmosphere
The variation in the maximum usable frequency (MUF) during geomagnetic disturbances is a key parameter for high-frequency (HF) radio communications. This study investigates MUF variability and related ionospheric parameters during the first geomagnetic ...
Onyinye G. Nwankwo, Fabio Becker-Guedes, Claudia M. N. Candido   +2 more
doaj   +1 more source

Space weather impact on the equatorial and low latitude F-region ionosphere over India [PDF]

Annales Geophysicae, 2006
For a detailed study of the space weather impact on the equatorial and low latitude F-region, the ionospheric response features are analysed during the periods of three recent and most severe magnetic storm events of the present solar cycle which ...
R. S. Dabas, R. M. Das, V. K. Vohra, C. V. Devasia   +3 more
doaj   +1 more source

An investigation of the ionospheric F region near the EIA crest in India using OI 777.4 and 630.0 nm nightglow observations [PDF]

Annales Geophysicae, 2018
Simultaneous observations of OI 777.4 and OI 630.0 nm nightglow emissions were carried at a low-latitude station, Allahabad (25.5° N, 81.9° E; geomag. lat.
N. Parihar, S. M. Radicella, B. Nava, Y. O. Migoya-Orue, P. Tiwari, R. Singh   +5 more
doaj   +1 more source

Longitudinal Variation of Ionospheric Irregularities and Response of the Ionosphere During 10–13 May and 10–13 October 2024 Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We examine the response of the ionosphere to the 10–13 May 2024 and 10–13 October 2024 geomagnetic storms, the two recent great geomagnetic storms of solar cycle 25. We identified the occurrence of ionospheric irregularities during the two geomagnetic storms.
Valence Habyarimana, Mark B. Moldwin, John Bosco Habarulema, Sharon Aol, Jean Claude Uwamahoro, Teshome Dugassa, Daniel Okoh, Solomon Otoo Lomotey   +7 more
wiley   +1 more source

Peculiar Magnetosphere‐Atmosphere Coupling and Its Impacts Over the South American Magnetic Anomaly Region

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The auroral‐like sporadic E‐layer is typically observed at altitudes between 100 and 150 km within the South American Magnetic Anomaly region. However, the occurrence of an unusual layer event detected above this altitude range on 18 July 2017 has raised intriguing questions regarding the physical processes responsible for the substantial ...
Lígia A. Da Silva, Hui Li, Laysa C. A. Resende, Vânia F. Andrioli, Angela M. Santos, Juliano Moro, Paulo R. Jauer, Luis Eduardo Vieira, Lívia R. Alves, José Paulo Marchezi, Jiankui Shi, Jiyao Xu, Paulo P. Batista, Jose V. Bageston, Yajun Zhu, Clezio M. Denardini, Chi Wang, Ezequiel Echer, Guotao Yang, Alexandre A. Pimenta, Joaquim R. Costa, Zhengkuan Liu   +21 more
wiley   +1 more source

Extreme Low‐Latitude Total Electron Content Enhancement and Global Positioning System Scintillation at Dawn

Space Weather, 2021
We report on an extreme ionospheric plasma density enhancement and Global Positioning System (GPS) scintillation at dawn, observed within the expanding equatorial ionization anomaly (EIA).
Sebastijan Mrak, Joshua Semeter, Yukitoshi Nishimura, Anthea J. Coster   +3 more
doaj   +1 more source

The Temporal Evolution of F-Region Equatorial Ionization Anomaly Owing to the 2022 Tonga Volcanic Eruption

, 2022
The dynamic evolutions of the noon ionospheric Equatorial Ionization Anomaly (EIA) owing to the 2022 Tonga volcanic eruption were investigated using the ionospheric plasma measurements from the Swarm satellite, the science experiment of the Constellation
Hui Wang, Chengyu Qian, Hao Xia, Yunfang Zhong, Kedeng Zhang   +4 more
core   +1 more source

Quantifying Uncertainty in OMNI Solar Wind Measurements Projected From L1 to the Earth's Bow Shock

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Many routine measurements of the solar wind plasma and interplanetary magnetic field (IMF) are made at the L1 Sun–Earth Lagrange point; therefore, it is helpful to characterize the errors introduced in propagating these measurements to the near‐Earth environment.
N. C. Rogers, J. A. Wild, A. Grocott
wiley   +1 more source

Self‐Limiting of Artificial Electron Radiation Belts: Evidence From the Starfish Prime High‐Altitude Nuclear Explosion

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The 1962 Starfish Prime high‐altitude 1.4‐megaton nuclear detonation injected large amounts of fission‐produced energetic electrons into the inner magnetosphere (L = 1.12), creating an intense artificial radiation belt that persisted for years. In this study, we revisit historical data from this unprecedented event to investigate the potential
L. Olifer, I. R. Mann
wiley   +1 more source

Quantitative Assessment of Geographic Control of December Solstice EIA Crest Shifts Over Southeast Asia Under Low Solar Activity

Space Weather, Volume 24, Issue 8, August 2026.
Abstract This study quantitatively assesses the drivers of the Equatorial Ionization Anomaly (EIA) morphology and latitudinal shifts over Southeast Asia during the December solstice. We use a 27‐year ionospheric data set (1998–2024) of total electron content (TEC) and F2‐layer peak electron density (NmF2) under geomagnetically quiet conditions.
Linfeng Huang, Jinsong Wang, Tian Mao, Shanhai Song, Yungang Wang   +4 more
wiley   +1 more source