Results 71 to 80 of about 5,388 (217)

Coincident Observations by the Kharkiv IS Radar and Ionosonde, DMSP and Arase (ERG) Satellites, and FLIP Model Simulations: Implications for the NRLMSISE‐00 Hydrogen Density, Plasmasphere, and Ionosphere

Geophysical Research Letters, 2018
This paper reports the results of ionosphere and plasmasphere observations with the Kharkiv incoherent scatter radar and ionosonde, Defense Meteorological Satellite Program, and Arase (ERG) satellites and simulations with field line interhemispheric ...
D. Kotov, P. Richards, V. Truhlík, O. Bogomaz, M. Shulha, N. Maruyama, M. Hairston, Y. Miyoshi, Y. Kasahara, A. Kumamoto, F. Tsuchiya, A. Matsuoka, I. Shinohara, M. Hernández‐Pajares, I. Domnin, T. Zhivolup, L. Emelyanov, Ya. M. Chepurnyy   +17 more
semanticscholar   +1 more source

Validation of the IRI‐2020 Model Topside Ionosphere Options Through COSMIC‐1 and COSMIC‐2 Radio Occultation Profiles Collocated With Ionosonde Observations

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study validates the four topside ionosphere model options included in the latest release of the International Reference Ionosphere (IRI‐2020) model: IRI‐2001, IRI‐2001cor, IRI‐NeQuick, and the default IRI‐COR2. To assess their ability to reproduce the topside profile while minimizing uncertainties associated with F2‐layer peak modeling ...
A. Pignalberi, H. Haralambous, D. Bilitza, P. Coïsson, B. Nava, M. Pezzopane, F. Prol, A. Smirnov, D. R. Themens, C. Xiong   +9 more
wiley   +1 more source

Combination of High-Rate Ionosonde Measurements with COSMIC-2 Radio Occultation Observations for Reference Ionosphere Applications

Atmosphere
Knowledge of ionospheric plasma altitudinal distribution is crucial for the effective operation of radio wave propagation, communication, and navigation systems.
Iurii Cherniak, David Altadill, Irina Zakharenkova, Víctor de Paula, Víctor Navas-Portella, Douglas Hunt, Antoni Segarra, Ivan Galkin   +7 more
doaj   +1 more source

Performance Investigation of Four Ionospheric Models in Estimating hmF2 in High‐Latitude Regions

Space Weather, Volume 24, Issue 7, July 2026.
Abstract As a critical parameter characterizing the vertical structure of the ionosphere, the peak height of the F2 layer (hmF2) plays an essential role in frequency selection and signal propagation in high‐frequency (HF) communication systems. Accurate prediction of hmF2 is particularly important in high‐latitude regions.
T. Y. Li, Q. Yu, Y. F. Shi, C. Yang, J. Q. Fan, J. Wang   +5 more
wiley   +1 more source

Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

, 2018
. Ionosonde data and crustal earthquakes with magnitude M≥6.0 observed in Greece during the 2003–2015 period were examined to check if the relationships obtained earlier between precursory ionospheric anomalies and earthquakes in Japan and central Italy
L. Perrone, A. Santis, C. Abbattista, L. Alfonsi, L. Amoruso, M. Carbone, C. Cesaroni, G. Cianchini, G. Franceschi, A. D. Santis, R. D. Giovambattista, D. Marchetti, F. Pavón‐Carrasco, A. Piscini, L. Spogli, F. Santoro   +15 more
semanticscholar   +1 more source

Ionosonde-based indices for improved representation of solar cycle variation in the International Reference Ionosphere model

Journal of Atmospheric and Solar-Terrestrial Physics, 2017
A new monthly ionospheric index, IG NS , is presented to improve the representation of the solar cycle variation of the ionospheric F2 peak plasma frequency, foF2.
Steven Brown, D. Bilitza, Erdal Yiğit
semanticscholar   +1 more source

Large‐Scale Traveling Ionospheric Disturbances Over the Asian‐Pacific Sector During 10–11 May 2024 Geomagnetic Superstorm: Ionosonde Observation and MAGE Simulation

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract The large‐scale traveling ionospheric disturbances (LSTIDs) over the Asian‐Pacific sector during the 10–11 May 2024 superstorm are investigated using ionosonde observation and simulation from a whole geospace model—Multiscale Atmosphere Geospace Environment (MAGE), which fully couples multiple magnetosphere, ionosphere and thermosphere models.
Tianyang Hu, Wenbin Wang, Kevin H. Pham, Haonan Wu, Liying Qian, Quan Gan, Nicholas M. Pedatella   +6 more
wiley   +1 more source

Height‐Dependent Evolution of the Ionospheric Response to the May 2024 Superstorm: Global GNSS‐POD, GNSS‐RO, and Ground‐Based Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Capturing global ionospheric response during extreme geomagnetic storms remains a major observational challenge. During 10–11 May, 2024 superstorm, we investigate the height‐dependent response of the F‐region using multi‐constellation GNSS‐POD limb‐sounding measurements from COSMIC‐2, Spire, PlanetiQ, and FengYun‐3 satellites. Approximately 12,
Nimalan Swarnalingam, Dong L. Wu, Daniel J. Emmons, Cornelius Csar Jude H. Salinas   +3 more
wiley   +1 more source

Gravity Wave Influences on MSTID Climatology Over CONUS: WACCM‐X Year‐Long Simulation and GNSS Long‐Term Observation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Medium‐Scale Traveling Ionospheric Disturbances (MSTIDs) are prominent wave‐like structures in the ionosphere, with complex generation mechanisms involving both atmospheric gravity waves (GWs) and electrodynamic instabilities such as the Perkins instability (PI).
Jing Liu, Shun‐Rong Zhang, Hanli Liu, Anthea J. Coster, Philip J. Erickson   +4 more
wiley   +1 more source

The new CAS-DIS digital ionosonde

Annals of Geophysics, 2013
A high quality digital ionosonde called the Chinese Academy of Sciences digital ionosonde (CAS-DIS) has been developed for investigations of the ionosphere. Two important features are used for the CAS-DIS; first, the technique of analog down-conversion has been replaced by the new approach of digital down-conversion technology.
Wang Shun, Chen Ziwei, Zhang Feng, Fang Guangyou   +3 more
openaire   +3 more sources