Results 71 to 80 of about 853 (193)

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

Equatorial Electrojet and electron density over Southeast Asian Region during moderate solar activity condition [PDF]

, 2021
125-131The study presents a simultaneous variation of equatorial electrojet (EEJ) current and the ionospheric F2-layer maximum electron density (NmF2) during geomagnetic quiet days and moderate solar conditions (solar radio flux, 10.7 120 sfu).
Bello, Saeed Abioye, Hamid, Nurul Shazana Abdul, Yoshikawa, Akimasa, Abdullah, Mardina, Tsugawa, Takuya, Hozumi, Kornyanat   +5 more
core  

Introducing Reflected GNSS TEC Data Into ANCHOR Ionospheric Data Assimilation Model

Space Weather
ANCHOR is a novel data assimilation (DA) algorithm developed at the U.S. Naval Research Laboratory to improve ionospheric nowcasting by increasing accuracy and decreasing computational cost.
Brenna Royersmith, Victoriya V. Forsythe, Brian Breitsch, Meghan R. Burleigh, Kate A. Zawdie, Y. Jade Morton   +5 more
doaj   +1 more source

Ionospheric response to the weak geomagnetic storm of 1–2 February 2025 in the Weddell Sea Anomaly region: observations from Ukrainian Antarctic Akademik Vernadsky station

Український антарктичний журнал
The ionospheric response to the weak geomagnetic storm of 1–2 February 2025 was studied within the Weddell Sea Anomaly region. The behavior of the key ionospheric parameters (NmF2 and hmF2) was analysed using ionosonde observations from the Ukrainian ...
Maryna Reznychenko, Oleksandr Bogomaz, Dmytro Kotov, Taras Zhivolup, Kateryna Martynova, Viktor Burmaka, Vyacheslav Kolodyazhnyi   +6 more
doaj   +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

A Major Update to the PyIRI Model

Space Weather, Volume 24, Issue 6, June 2026.
Abstract This paper presents a major update to the PyIRI model, a fully vectorized Python implementation of the International Reference Ionosphere (IRI). The update reformulates the IRI core coefficients using spherical harmonics in Quasi‐Dipole (QD) latitude and Magnetic Local Time coordinates, replacing the legacy geographic‐coordinate‐based basis ...
Nina Servan‐Schreiber, Victoriya V. Forsythe, Meghan R. Burleigh, Kate A. Zawdie, Douglas P. Drob, Angeline G. Burrell, Joshua Semeter   +6 more
wiley   +1 more source

Investigation of the Electron Density Variation During the 21 August 2017 Solar Eclipse

Geophysical Research Letters, 2018
This paper presents a comparison of modeled and measured electron densities for the 21 August 2017 solar eclipse across the USA. The location of the instrument was (43.81°N, 247.32°E) where the maximum obscuration of 99.6% occurred at 17.53 hr UT on 21 ...
B. W. Reinisch, P. B. Dandenault, I. A. Galkin, R. Hamel, P. G. Richards   +4 more
doaj   +1 more source

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

Remote Sensing, 2020
Recommendations of the International Reference Ionosphere (IRI) Workshop 2017 in Taoyuan City, Taiwan and International GNSS Service (IGS) Workshop 2018 in Wuhan, China included establishment of an ionosphere mapping service that would fuse measurements ...
Adam Froń, Ivan Galkin, Andrzej Krankowski, Dieter Bilitza, Manuel Hernández-Pajares, Bodo Reinisch, Zishen Li, Kacper Kotulak, Irina Zakharenkova, Iurii Cherniak, David Roma Dollase, Ningbo Wang, Paweł Flisek, Alberto García-Rigo   +13 more
doaj   +1 more source

Ionospheric Vertical Plasma Drifts Over South America: Long‐Term Multi‐Instrument Observations and TIEGCM and WACCM‐X Evaluations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract We present the first comprehensive multi‐instrument climatological study of quiet‐time equatorial F‐region vertical plasma drifts across South America, a region where the magnetic declination angle varies significantly. Our analysis of well‐established long‐term ground‐based data sets from the Jicamarca incoherent scatter radar spanning 1968 ...
Sophia R. Laranja, Bela G. Fejer, Clezio M. Denardini, Ludger Scherliess, Laysa C. A. Resende, Sony S. Chen, Giorgio A. S. Picanço   +6 more
wiley   +1 more source

Ionospheric climatology at Africa EIA trough stations during descending phase of sunspot cycle 22

, 2018
International audienceThe African equatorial ionospheric climatology during the descending phase of sunspot-cycle 22 (spanning 19921996) was investigated using 3 ionosondes located at Dakar (14.70 N, 342.60 E), Ouagadougou (12.420 N, 358.60 E), and ...
Rabiu, A. B., A.B. Rabiu, C. Amory-Mazaudier, O.S. Bolaji, B.O. Adebesin, Abedesin, B.O., J.O. Adeniyi, Amory-Mazaudier, Christine, Bolaji, O. S.   +8 more
core   +2 more sources