Results 71 to 80 of about 91,577 (233)

The Mother's Day Storm of 2024 Triggered the Strongest Nighttime Radiative Emission of the SABER Era

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract The response of Nitric Oxide (NO) 5.3 µm infrared radiative emission to the 2024 Mother's Day storm is investigated by utilizing Sounding of Atmosphere using Broadband Emission Radiometry (SABER) observations onboard the Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics (TIMED) satellite.
Tikemani Bag, Vir Singh
wiley   +1 more source

Persistence of the Prereversal Enhancement of the Equatorial Vertical Plasma Drifts Observed by ICON

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract An important feature of equatorial ionospheric electrodynamics is the evening prereversal enhancement (PRE) of the eastward electric fields and the associated vertical plasma drifts. The magnitude, timing, and duration of the PRE are closely connected to the development of postsunset F‐region irregularities.
A. Kirchman, D. L. Hysell
wiley   +1 more source

Simulation Study of Chorus Wave Modulation and Associated Electron Precipitation

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract The modulation of chorus waves on several‐second timescales in Earth's magnetosphere plays a crucial role in modulating electron precipitation intensity, leading to the formation of pulsating aurora. However, the physical mechanism underlying chorus modulation remains not fully understood.
Huayue Chen, Xueyi Wang, Rui Chen, Lunjin Chen, Yoshiharu Omura, Yoshizumi Miyoshi, Xiaolei Li, Yi‐Kai Hsieh   +7 more
wiley   +1 more source

Ionospheric Response to the Extreme Geomagnetic Storm of 10–11 May 2024 Based on Total Electron Content Observations in the Central Asian and East Asian Regions

Atmosphere
The ionospheric response to the major geomagnetic storm (SYM-H = −518 nT) of 10–11 May 2024 was investigated using total electron content (TEC) observations from the Central Asian (CAR) and East Asian (EAR) regions.
Galina Gordiyenko, Feza Arikan, Yuriy Litvinov, Murat Zhiganbaev   +3 more
doaj   +1 more source

Long‐Term Trends of Ionospheric Day‐to‐Day Variability During the Past Century

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract In this study, we explore the long‐term trend of ionospheric day‐to‐day variability induced by atmospheric perturbations over the past century, using time‐slice simulations by the whole atmospheric model. The main results show that the magnitude of the trends in the past century maximizes ∼±1% of the seasonal mean per decade.
Xu Zhou, Wenbo Li, Huixin Liu, Lianhuan Hu, Yi Li, Xinan Yue   +5 more
wiley   +1 more source

Chemical Heating as a Feedback Mechanism in the Mesopause Region

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract An analytical expression is derived which shows that the release of chemical heat from exothermic chemical reactions is a negative nonlinear feedback mechanism relative to temperature in the mesopause region. This role is confirmed through model simulations. This feedback mechanism stabilizes the thermal regime of the mesopause region.
M. Grygalashvyly, W. Ward, C. C. Stephan, P. Hartogh   +3 more
wiley   +1 more source

Improving the Quality of Magnetograms Using Data from Several Magnetic Observatories

Applied Sciences
The formation of international networks of magnetic observatories has provided new opportunities for monitoring geomagnetic disturbances and solving problems related to space weather.
Ivan Vassilyev, Zhassulan Mendakulov, Beibit Zhumabayev, Igor Kozin, Oleg Beloslyudtsev, Samal Dossaibekova   +5 more
doaj   +1 more source

Auroral Asymmetry Associated With the South Atlantic Anomaly

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract The South Atlantic anomaly (SAA) exerts a weakening effect on magnetic field strength on Earth, however, little is known of its effect on the auroral spatial distribution and temporal evolution. Using Defense Meteorological Satellite Program/Special Sensor Ultraviolet Spectrographic Imager ultraviolet data spanning 2016–2023, we investigated ...
Wenrui Wang, Keyi Huang, Qiugang Zong, Ying Liu, Li Li, Yuguang Ye   +5 more
wiley   +1 more source

Seismogenic Effects in Variation of the ULF/VLF Emission in a Complex Study of the Lithosphere–Ionosphere Coupling Before an M6.1 Earthquake in the Region of Northern Tien Shan

Geosciences
A complex study was performed of the disturbances in geophysics parameters that were observed during a short-term period of earthquake preparation. On 4 March 2024, an M6.1 earthquake (N 42.93, E 76.966) occurred with the epicenter 12.2 km apart from the
Nazyf Salikhov, Alexander Shepetov, Galina Pak, Serik Nurakynov, Vladimir Ryabov, Valery Zhukov   +5 more
doaj   +1 more source

Statistical Study on the Lower Mesospheric and Upper Stratospheric Ozone Changes Observed by Aura MLS Satellite During the Multiple Solar Eclipses

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 20, 28 October 2025.
Abstract Solar eclipse events (SEs) provide an excellent natural experiment for the response of the middle atmosphere to short‐term changes in solar radiation. For this study, we quantify radiation variations through obscuration, which is defined as the fraction of the solar disk obscured by the Moon during SEs.
T. Yang, T. Nagahama, A. Mizuno
wiley   +1 more source