Results 41 to 50 of about 301 (185)

Equatorial F‐Region Responses to the Main Phase of the 10 May 2024 Geomagnetic Storm Over the South American Sector: Observations and Model Simulations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study examines the equatorial ionospheric response over the South American sector during the onset of the extreme 2024 Mother's Day geomagnetic storm, which began at ∼17 UT on 10 May and reached the G5 level. Pronounced disturbances in ionospheric electrodynamics were observed under both daytime and nighttime conditions. Variations in the
A. M. Santos, J. R. Souza, I. S. Batista, M. Bravo, C. G. M. Brum, J. H. A. Sobral, S. S. Chen, R. Sá, L. C. A. Resende, J. Moro, P. R. Jauer, L. da Silva, D. Medeiros, P. A. B. Nogueira, E. A. Kherani, V. F. Andrioli, M. A. Abdu, G. S. Adeniran, R. de Jesus, A. A. Pimenta, G. Yang, F. A. de Souza   +21 more
wiley   +1 more source

Multi-Station and Multi-Instrument Observations of F-Region Irregularities in the Taiwan–Philippines Sector

Remote Sensing, 2022
In this study, a multi-station and multi-instrument system, organized and proposed for ionospheric scintillation and equatorial spread-F (ESF) specification and their associated motions in the Taiwan–Philippines sector, is outlined. The issues related to
Lung-Chih Tsai, Shin-Yi Su, Jun-Xian Lv, Terry Bullett, Chao-Han Liu   +4 more
doaj   +1 more source

On the growth and decay of irregularities in the ionosphere

Journal of Earth System Science, 1980
It has been demonstrated that VHF/UHF scintillation data can be used to evaluate important physical parameters such as scale sizes, strength, growth and decay of irregularities in the equatorial ionosphere. These parameters are important in constructing electroject models.
Hari om Vats, M R Deshpande
openaire   +2 more sources

Coupled Thermosphere–Ionosphere Dynamics During the 17 January 2013 Storm: GITM–TIDAS Comparison With Millstone Hill ISR Measurements

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This article analyzes a weak geomagnetic storm on January 17–18, 2013, using a first‐principles model (Global Ionosphere Thermosphere Model (GITM) with an empirical assimilative ionospheric model (TIDAS), evaluated against observations in the form of Millstone Hill (MH) incoherent scatter radar (ISR) altitude profiles and global navigation ...
Onyinye Nwankwo‐Omoloja, Aaron J. Ridley, Shun‐Rong Zhang, Philip J. Erickson   +3 more
wiley   +1 more source

Characterization of High‐Frequency GNSS Total Electron Content Variations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract Global Navigation Satellite System (GNSS)–derived Total Electron Content (TEC) is widely used to investigate ionospheric variability, but has primarily been applied to low‐frequency fluctuations. Here we present a long‐term statistical characterization of high‐frequency (30–500 mHz) TEC variations using multi‐constellation GNSS data from 11 ...
J. Pérez‐Coll Jiménez, N. Ivchenko, N. Partamies, M. Håkansson   +3 more
wiley   +1 more source

Statistics of Orientation of Nightside Auroral Arcs and Interplanetary Conditions

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract We present statistics and dependence on interplanetary conditions of the orientation of nightside auroral arcs in the equatorward part of the auroral oval. The results related to the arcs essentially represent the orientation and dynamics of the equatorial boundary of the nightside auroral oval.
A. Kozlovsky, M. Myllymaa, R. Lukianova, T. Raita   +3 more
wiley   +1 more source

Classification of Equatorial Ionospheric Irregularities Using Unsupervised Machine Learning Based on Spatiotemporal ROTI Keograms

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Equatorial ionospheric irregularities, particularly those associated with equatorial plasma bubbles (EPB), can significantly disrupt satellite navigation and communication systems.
Gleb Mutasov, Pornchai Supnithi, Jirapoom Budtho, Napat Tongkasem, Michi Nishioka, Septi Perwitasari, Lin Min Min Myint   +6 more
doaj   +1 more source

Convection Velocity Covariance Estimated From SuperDARN Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract An examination of the spatial covariance of the high‐latitude plasma convection velocity is presented. The covariance was calculated from patterns of plasma convection estimated from Super Dual Auroral Radar Network observations. The convection patterns were calculated on a magnetic latitude—magnetic local time grid from 55° ${}^{\circ}$ to 88.
W. A. Bristow, M. F. Wilcox
wiley   +1 more source

An introduction to the Meteor and ionospheric Irregularity Observation System and its preliminary results

地球与行星物理论评
Meteoroids entering the Earth's atmosphere lose most of their mass during atmospheric passage and considerably disturb the background ionosphere. To elucidate better the effects of meteoroids on the near-Earth space environment, it is important to ...
Yi Li, Guozhu Li, Haiyong Xie, Wenjie Sun, Lianhuan Hu, Zhi Wu, Wenzhi Chen, Zhaoguo Huang, Baoyuan Wu, Xiukuan Zhao, You Yu, Shoumin Chang, Baiqi Ning, Libo Liu   +13 more
doaj   +1 more source

Synoptic Wind‐Dependent Sampling Asymmetry Biases Satellite Sea Surface Chlorophyll‐a in the Mid‐to‐High‐Latitude North Pacific and North Atlantic

Journal of Geophysical Research: Oceans, Volume 131, Issue 10, October 2026.
Abstract Satellite observations of sea surface chlorophyll‐a concentration (SChl) provide a basin‐scale record for interpreting marine productivity and upper ocean biogeochemical variability. However, clouds and other observational limits create gaps in SChl retrieval, which can bias the SChl record, especially in cloud‐prone mid‐to‐high‐latitude ...
Qixiang Wang, Zhaohui Chen, Chao Zhang, Xiaogang Xing, Haihong Guo, Haiyuan Yang, Dapeng Li, Wenju Cai   +7 more
wiley   +1 more source