Results 41 to 50 of about 606 (259)

Continental‐Scale Lightning Observations at High Frequency

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract We initiated high‐frequency (HF, 3–30 MHz) lightning observations to remotely study lightning processes using skywave propagation. HF lightning skywaves were detected at distances up to 3,300 km (potentially farther) during both day and night, with over 64% of events having peak currents below 50 kA.
Yunjiao Pu, Steven A. Cummer, Yongze Jia
wiley   +1 more source

KHI Development Between Inner LLBL and Magnetosphere on the Far Flanks as Observed by the MMS Mission

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract A boundary layer of finite thickness separates the magnetosheath and the magnetosphere. Within this boundary, we have the outer low‐latitude boundary layer (LLBL), the magnetopause current layer, and the inner LLBL. Earlier works point out that the interface on which Kelvin‐Helmholtz Instability (KHI) develops has implications for how ...
Dinesh K. V. Radhakrishnan, Stephen A. Fuselier, Katariina Nykyri, K.‐J. Hwang, Steven M. Petrinec, Daniel J. Gershman, James L. Burch   +6 more
wiley   +1 more source

Laboratory Realization of Magnetopause‐Like Reconnection in Space Plasma Environment Research Facility (SPERF)

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract Magnetic reconnection explosively converts magnetic energy into plasma heating and particle acceleration. At Earth's magnetopause, reconnection governs solar wind‐magnetosphere coupling and drives global convection. Understanding these processes requires resolving reconnection's spatiotemporal evolution, which is difficult for in situ ...
Kai Huang, Wenbin Ling, Huibo Tang, Jian Guan, Jihua Yang, Jiayin Xie, Gaoyuan Peng, Hanru Ma, Nan Wang, Tianyi Zhang, Zheng Cao, Shangkun Ren, Yangguang Ke, Ke Han, Yunning Dong, Yaowen Lu, Peng E, Quanming Lu   +17 more
wiley   +1 more source

Preface to the Special Issue on "Connection of Solar and Heliospheric Activities with Near-Earth Space Weather: Sun-Earth Connection"

Terrestrial, Atmospheric and Oceanic Sciences, 2013
This special issue of the Terrestrial, Atmospheric and Oceanic Sciences (TAO) presents a small collection of the materials presented at the 2011 International Space Plasma Symposium (ISPS), held at National Cheng-Kung University (NCKU) in Tainan, Taiwan,
Chin-Chun Wu Sunny W. Y. Tam
doaj   +1 more source

Linking Very Near‐Earth Reconnection (VNERX) to Mid‐Latitude GICs: Evidence From the 7 September 2017 Storm

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract Geomagnetically Induced Currents (GICs) are a hazard to power systems. In this letter, we present a case study to understand why a Sudden‐Commencement‐associated 20A GIC spike, measured at mid‐latitude in Virginia, US, increased to 30A within 2 min of interplanetary shock arrival.
Bhagyashree Waghule, Delores J. Knipp, Grant K. Stephens, David M. Malaspina   +3 more
wiley   +1 more source

Impact of Heavy Ions on the Structure of Current Sheets in the Gravity Field of Exoplanets and Stars

The Astrophysical Journal, 2023
Boundary current sheets (CSs) can be formed in collisionless space plasmas in the environment of exoplanets and cold stars. Usually they represent curved surfaces carrying the electric current analogous to the well-known planetary ionospheres ...
R. A. Kislov, H. V. Malova, O. V. Khabarova, L. M. Zelenyi, U. P. Antsiferova   +4 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

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

H2 Chemistry and Protonation in the Dayside Venusian Upper Atmosphere

The Astronomical Journal
Although H _2 is present in low concentrations, it critically controls the structure and composition of planetary upper atmospheres through protonation under solar extreme-ultraviolet and soft X-ray irradiation. Recent studies highlight the importance of
Shiqi Wu, Xiaoshu Wu, Yanxing Liu, Jun Cui   +3 more
doaj   +1 more source

Unveiling the First Impressions of the Wide‐Swath Altimetry SWOT Mission Over the Ganga River, India

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract The Surface Water and Ocean Topography (SWOT) mission offers novel global observations of river hydrodynamics, yet its performance across varied river morphologies remains understudied. We evaluate SWOT node and raster products over a ∼210 km stretch of the Ganga River, India, during the fast‐sampling phase, using GNSS‐based continuous ...
Pankaj R. Dhote, Ankit Agarwal, Adrien Paris, Gaurish Singhal, Praveen K. Thakur, Hind Oubanas, Daniel M. Moreira, Laetitia Gal, Vaibhav Garg, Pramod Kumar, Raghavendra P. Singh, Stephane Calmant   +11 more
wiley   +1 more source