Results 91 to 100 of about 8,882 (233)

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

Optimizing HAARP Beam Pattern for Generation of Strong F‐Region Field‐Aligned Irregularities

Radio Science, Volume 61, Issue 7, July 2026.
Abstract Field‐aligned irregularities (FAIs) are the signatures of plasma turbulence and convection in the mid‐ and high‐latitude F‐region ionosphere, and also provide coherent backscatter targets for HF radars. To serve irregularity generation and characterization studies, we conducted experiments at the High‐frequency Active Auroral Research Program (
T. S. Anderson, E. H. Lay, I. T. Cummings, C. A. Jeffery, P. A. Bernhardt, M. McCarrick, W. A. Bristow, S. J. Briczinski   +7 more
wiley   +1 more source

Soft Proton Environment Modeling for SMILE Using XGBoost and Solar Cycle–Informed Synthetic Data Sets

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Soft proton contamination presents a persistent threat to the performance of space‐based X‐ray observatories such as ESA's upcoming Solar‐wind Magnetosphere Ionosphere Link Explorer (SMILE). This study develops a machine‐learning framework for modeling soft proton fluxes in the 92.2–159.7 keV range, tailored to SMILE's elliptical, highly ...
Simon Mischel, Elena A. Kronberg, C. P. Escoubet   +2 more
wiley   +1 more source

New Observations of Cosmic Noise Absorption in the South American Magnetic Anomaly (SAMA) Using a Next‐Generation Riometer

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study reports the first observations of cosmic noise power (CNP) and cosmic noise absorption (CNA) obtained with a next‐generation riometer installed at the Southern Space Observatory (SSO/INPE) in Brazil, located within the South American Magnetic Anomaly (SAMA).
J. Moro, E. Correia, C. M. Wrasse, J. R. Costa, J. V. Bageston, C. M. Denardini, A. J. Valcorte, L. C. A. Resende, A. M. Santos, L. A. da Silva, J. P. Marchezi, T. S. Trondsen   +11 more
wiley   +1 more source

Supporting Informed Shutter Operations for SMILE's SXI Using Ensemble Classifiers for Soft Proton High Flux Period Predictions

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Satellite X‐ray imagers are highly vulnerable to contamination by soft protons (∼100 keV), which can trigger spurious charge‐coupled device events and force interruptions in observations. For XMM‐Newton, such contamination reduced usable science time by ∼40%.
Simon Mischel, Elena A. Kronberg, C. P. Escoubet   +2 more
wiley   +1 more source

QEUV vs. Other EUV Proxies: A Re‐Evaluation of Solar EUV Proxies for Thermospheric and Space Weather Investigations

Space Weather, Volume 24, Issue 7, July 2026.
Abstract F10.7, Mg II, and F30 are widely used proxies for variability in solar Extreme UltraViolet (EUV, 5–120 nm) irradiance. An alternative proxy for solar EUV variability is QEUV, an indirect measure of total solar EUV irradiance, retrieved from observations of Earth's Far UltraViolet (FUV, 120–300 nm) airglow and from empirically modeled solar EUV
F. I. Laskar, W. K. Peterson, P. C. Chamberlin, R. W. Eastes, T. E. Berger, K. R. Greer, J. S. Evans, A. W. Yau   +7 more
wiley   +1 more source

Contrasting Space Weather Drivers of Two Geomagnetically Induced Current Events in Alberta, Canada During the May 2024 Superstorm

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Strong geomagnetic disturbances (GMDs) caused by intense space storms induce geomagnetically induced currents (GICs) in the Earth and within long conductive infrastructure, potentially posing risks to electricity transmission systems. Here, we investigate the solar wind conditions and magnetospheric processes responsible for two significant ...
Hannah G. Parry, Darcy R. Cordell, Sneha S. Babu, Ryan MacMullin, Ian R. Mann   +4 more
wiley   +1 more source

Introduction to TREx‐ATM V2.0: A Versatile Model of Auroral Transport and Its Effects in the Ionosphere

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Auroral transport models (ATMs) play an important role in quantitative studies of optical auroras, their driving mechanisms, and their effects on the ionosphere and thermosphere. TREx‐ATM was initially developed as the support model for the Transition Region Explorer (TREx) mission, and has gained increasing applications in the community in ...
Jun Liang, E. Donovan, E. Spanswick, C. Gabrielse, D. Chaddock, J. Houghton   +5 more
wiley   +1 more source

New MAVEN NGIMS Mars Thermosphere Temperature Database for Short Term Variability and Long Term Trends

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Current Mars thermospheric temperatures databases have course temporal resolution due to either a lack of data or a need to average over several orbits of data, preventing the study of short‐term, rapid changes to the Mars thermosphere. In this study, we present a new Mars thermosphere temperature database derived from individual orbits of ...
N. B. Pickett, M. Felici, N. Jones, D. Pawlowski, P. Withers, M. Benna, S. Curry   +6 more
wiley   +1 more source

Characteristics of Post‐Sunset Equatorial Plasma Bubble Occurrences Over Indonesia During a Geomagnetic Storm in August 2024

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract We investigated characteristics of post‐sunset equatorial plasma bubbles (EPBs) generated over Indonesia during a geomagnetic storm on 12 August 2024 using Global Navigation Satellite System and ionosonde data. During the August geomagnetic storm, EPBs were generated after sunset over the eastern part of Indonesia (∼120°–130°E) but not over ...
Takuya Sori, Prayitno Abadi, Ihsan Naufal Muafiry, Teguh Nugraha Pratama, Sri Ekawati, Dyah Rahayu Martiningrum, Noersomadi, Edy Maryadi, Febrylian Fahmi Chabibi, Michi Nishioka, Septi Perwitasari, Mamoru Yamamoto   +11 more
wiley   +1 more source