Results 71 to 80 of about 47,066 (211)

High-midlatitude ionosphere response to major stratospheric warming [PDF]

Earth, Planets and Space, 2015
Abstract This study investigates the impact of dynamical processes in the neutral atmosphere on the high-midlatitude ionosphere during two sudden stratospheric warming (SSW) events. For this purpose, the reanalysis meteorological data of the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) and
Shpynev, Boris G, Kurkin, Vladimir I, Ratovsky, Konstantin G, Chernigovskaya, Marina A, Belinskaya, Anastasiya, Grigorieva, Svetlana A, Stepanov, Alexander E, Bychkov, Vasily V, Pancheva, Dora, Mukhtarov, Plamen   +9 more
openaire   +1 more source

Modeling Storm‐Time Post‐Midnight Equatorial Plasma Bubbles With SAMI3‐WACCMX: Impacts of Neutral Winds, Thermospheric Composition, and Atmospheric Waves

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract This study investigates the roles of neutral winds, composition and atmospheric waves in storm‐time post‐midnight equatorial plasma bubble (EPB) development using the coupled SAMI3‐WACCMX model. Simulations reveal the formation of post‐midnight EPBs extending beyond 1,500 km in altitude and persisting into the post‐sunrise period.
Min‐Yang Chou, J. D. Huba, Jack Wang, Jia Yue, Maksym Petrenko   +4 more
wiley   +1 more source

Instability Mechanisms for the F‐Region Plasma Irregularities Inside the Midlatitude Ionospheric Trough: Swarm Observations

Space Weather, 2021
The midlatitude ionospheric trough (MIT) is a well‐known feature in the topside ionosphere. Previous MIT related studies mainly focused on the MIT structure itself, while few studies focused on irregularities inside the MIT region.
Yiwen Liu, Chao Xiong, Xin Wan, Yeping Lai, Yuhao Wang, Xiao Yu, Ming Ou   +6 more
doaj   +1 more source

Impacts of Mid‐Latitude Ionospheric Dynamics on RF Applications During the November 2025 Superstorm Event

Geophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract This study demonstrates the intriguing and complex interplay among auroral precipitation, enhanced TEC, density irregularities, and amplitude scintillations observed during the November 2025 superstorm. For the first time, we present observations of strong amplitude scintillation across continental United States (CONUS)—nearly from coast to ...
E. Yizengaw, W. Younas, Y. Nishimura, C. Gabrielse, T. Beach, A. J. Coster, R. Pradipta, K. M. Groves   +7 more
wiley   +1 more source

Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Pi2 oscillations are known to be associated with cavity mode oscillations (CMOs) in the inner magnetosphere at low latitudes. CMOs can also be excited by interplanetary shocks on the dayside. We present results from a global linear MHD wave model in spherical coordinates that allows us to analyze these waves at equatorial latitudes.
K. Majmudar, R. L. Lysak, K. Takahashi
wiley   +1 more source

Connections Between Stratospheric GWs, the Polar Vortex, and MSTIDs From Longitudinally Distinct Regions During Nine Arctic Winters

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Midlatitude medium‐scale traveling ionospheric disturbances (MSTIDs) are a common source of ionospheric variability that may influence GNSS‐based positioning and can disrupt HF‐communication channels. Here, we present a comprehensive nine‐winter analysis (2014–2023) that establishes a robust connection between stratospheric gravity waves (GWs)
S. Derghazarian, L. Goncharenko, V. L. Harvey, S.‐R. Zhang, A. Coster, E. Becker, G. Kwon   +6 more
wiley   +1 more source

Assimilating GNSS Airborne Radio Occultation Bending Angles With MPAS–JEDI During a Sequence of Atmospheric Rivers

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 9, September 2026.
Abstract Global Navigation Satellite System (GNSS) airborne radio occultation (ARO) observations, collected during Atmospheric River Reconnaissance (AR Recon) campaigns, enhance AR sampling beyond traditional dropsondes. Assimilating ARO bending angles requires a forward operator accounting for ARO geometry and proper integration in a data assimilation
Ivette Hernández Baños, Jennifer S. Haase, Pawel Hordyniec, Bing Cao, Zhiquan Liu, Phuong‐Nghi Do   +5 more
wiley   +1 more source

Ionospheric Density Irregularities, Turbulence, and Wave Disturbances During the Total Solar Eclipse Over North America on 21 August 2017

Geophysical Research Letters, 2018
Data from ionosonde and global positioning system (GPS) total electron content (TEC) observations reveal a number of ionospheric phenomena during the total solar eclipse on 21 August 2017 over North America. The eclipse started over the West Coast at ∼16:
Rezy Pradipta, Endawoke Yizengaw, Patricia Doherty   +2 more
doaj   +1 more source

On the Origin of Summer Sporadic E Periodicities at Midlatitudes

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Summertime midlatitude sporadic E (Es) layers exhibit daily periodicities whose underlying physical causes remain to be fully identified. We investigate the origin of these periodicities by analyzing an 11‐year data set (2007–2017) comprising ionosonde measurements, FORMOSAT‐3/COSMIC radio occultation (RO) observations, and WACCM‐X neutral ...
Xu Yan, Hongtao Cai, Yusong Qin, Chao Xiong, Jiawei Zhou, Hongwen Xu, Lubing Yang   +6 more
wiley   +1 more source

Interplanetary magnetic field and its possible effects on the mid-latitude ionosphere III

Annals of Geophysics, 1996
Using critical frequencies, f0F2 from the Lannion, Slough, Poitiers, Garchy, Dourbes, Rome, Juliusrud, Gibilmanna, Pruhonice, Uppsala, Kaliningrad, Miedzeszyn, Sofia, Athens and Kiev ionosonde stations, the possible effects of the orientation of the ...
Y. Tulunay
doaj   +1 more source