Results 51 to 60 of about 3,042 (156)

Electron Phase Space Densities in Geostationary Orbits as Measured With GK2A, GOES‐16, and GOES‐17 Satellites

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract This study investigated electron phase space densities (PSDs) in geostationary orbits using data from Korea's geostationary satellite, GK2A, as well as GOES‐16 and GOES‐17 satellites. The PSDs were computed from electron fluxes measured by each satellite during a geomagnetically quiet period as defined by stringent conditions on geomagnetic ...
C. H. Lee, J. Seon, W. H. Seol, K. H. Kim, D. E. Larson, G. K. Parks, H. U. Auster, W. Magnes, S. Kraft, D. Y. Lee, A. Boudouridis, P. T. M. Loto'aniu, J. V. Rodriguez   +12 more
wiley   +1 more source

Limits on the Efficacy of Wave‐Particle Interaction on the Energization and Transport of Atomic and Molecular Heavy Ionospheric Ions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Ionospheric molecular ions, such as N2+ ${\mathrm{N}}_{2}^{+}$, NO+, and O2+ ${\mathrm{O}}_{2}^{+}$, have been observed in Earth's high‐altitude ionosphere and the magnetosphere by several spacecraft missions. Their presence not only indicates that they obtain sufficient energy through effective energization mechanisms, predominantly during ...
Mei‐Yun Lin, Raluca Ilie, Alex Glocer
wiley   +1 more source

Magnetically Quiet‐Time Traveling Ionospheric Disturbances Over Mid‐Latitude Eastern Europe Observed by the Kharkiv Incoherent Scatter Radar During the 24th Solar Cycle

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract We have detected and characterize traveling ionospheric disturbances (TIDs) in the mid‐latitude ionosphere over Europe using data from the Kharkiv incoherent scatter (IS) radar. The study focused on observations near solstices and equinoxes during solar cycle 24 under magnetically quiet conditions.
Kateryna D. Aksonova, Sergii V. Panasenko, Dalia Buresova, Larisa P. Goncharenko, Shun‐Rong Zhang, Igor F. Domnin   +5 more
wiley   +1 more source

Ionospheric D Region: Characteristics Near Dawn and Dusk

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract The characteristics of very low frequency (VLF) radio wave propagation in the Earth‐ionosphere waveguide are determined particularly through dawn and dusk using phase and amplitude measurements of man‐made signals propagating below the ionospheric D region. For the first time variations of “Wait” height and sharpness parameters, H' and β, have
Neil R. Thomson, Mark A. Clilverd, Craig J. Rodger   +2 more
wiley   +1 more source

Lightning‐Induced Electron Precipitation Events Observed at Low Altitudes

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Lightning‐induced electron precipitation (LEP) events are important phenomena in the Earth's inner magnetosphere, where atmospheric lightning strokes cause energetic electron loss from the radiation belts. Lightning strokes generate electromagnetic waves that penetrate the ionosphere and propagate through the Earth's magnetosphere as so‐called
V. Linzmayer, F. Němec, O. Santolík, I. Kolmašová   +3 more
wiley   +1 more source

Correlation Between the Delay and Rise Time of VLF/LF Amplitudes During 20 Solar X‐Ray Flares Observed in February 2014 at Mid‐Latitude

Radio Science, Volume 60, Issue 4, April 2025.
Abstract During daylight hours, the concentration of electrons in the ionosphere can be amplified by solar flares, which may subsequently influence the propagation of radio waves. Previous research on Very Low Frequency (VLF) signals focused on X‐class and M‐class flares.
Y. Liu, M. Füllekrug
wiley   +1 more source

Successively Equatorward Propagating Ionospheric Acoustic Waves and Possible Mechanisms Following the Mw 7.5 Earthquake in Noto, Japan, on 1 January 2024

Space Weather, Volume 23, Issue 4, April 2025.
Abstract On 1 January 2024, the Mw 7.5 Noto Peninsula earthquake in Japan generated ionospheric disturbances detected via dense GNSS networks. Significant coseismic acoustic waves emerged ∼8 min post‐event, exhibiting 0.3 TECU amplitudes, 2–8 min periods, and ∼1 km/s propagation speeds.
Bing Zhang, Tong Liu, Xueshang Feng, Guochang Xu   +3 more
wiley   +1 more source

Data‐Driven Transfer Functions From Differential Magnetometer Measurements to Enhance GIC Model Validation Capability: A Case Study in the Spanish Power Grid

Space Weather, Volume 23, Issue 4, April 2025.
Abstract Geomagnetically induced currents (GICs) are unwanted currents flowing in long grounded conductors because of space weather phenomena. Example GICs are those flowing in power transmission lines via grounded transformer neutrals. Prediction models, used to foresee the amplitudes and waveforms of those currents and to identify weak points in ...
S. Marsal, J. M. Torta, A. Martí, R. Hafizi, P. Piña‐Varas, A. Marcuello, J. Ledo, J. J. Curto, P. Queralt, O. Cid, M. Ibañez   +10 more
wiley   +1 more source

The Magnetosphere‐Ionosphere‐Ground Responses to the May 2024 Super Solar Storm

Space Weather, Volume 23, Issue 4, April 2025.
Abstract Earth suffered the attack of the strongest geomagnetic storm in the last 20 years (Kp = 9, Dst∼ ${\sim} $ −400 nT) occurred on 11 May 2024. Taking advantage of the LEO multi‐parameter CSES satellite (launched in 2018) with a large inclination angle 97° $97{}^{\circ}$, with the joint observations of NOAA and GOES, we present a comprehensive ...
Zhenxia Zhang, Fang Zhang, Lu Wang, Xinqiao Li, Zeren Zhima, Yongfu Wang, Yanyan Yang, Dehe Yang, Shujie Li, Wei Chu, Na Zhou, Dedong Wang, Dali Zhang, Roberto Battiston, Roberto Iuppa, Xuhui Shen   +15 more
wiley   +1 more source

Comprehensive Warming Assessment in a High‐Altitude Region: Observational Evidence From Qinghai Province, Northwest China

Earth and Space Science, Volume 12, Issue 4, April 2025.
Abstract The recent trends of global warming slowdown have garnered increased attention in the field of climate science. The Qinghai province, a high‐altitude region in northwest China, is highly sensitive to climate change, and understanding its response to the warming slowdown is crucial.
Xiang Zou, Guangxue Guo, Shugui Hou
wiley   +1 more source