Results 91 to 100 of about 408,077 (211)
Minor ion composition in the polar ionosphere
Geophysical Research Letters, 1991 Ion composition measurements from the EXOSD Suprathermal Ion Mass Spectrometer (SMS) are presented. Ions other than H+, notably O+, He+, O++ N+ and N++, are found to constitute a significant (>0.1) and at times dominant (>0.5) component of the thermal ion population in the high‐altitude polar ionosphere.
Andrew W. Yau +2 more
openaire +1 more source
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.Abstract Lightning activity is strongly concentrated in tropical continental “chimneys”, among which the African lightning chimney stands out as the most intense globally. However, until recently, the incomplete and spatially uneven detection efficiency of ground‐based lightning networks, together with the limited spatio‐temporal coverage of satellite ...
K. Németh +8 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.Abstract Ground deformation of dormant volcanoes provides critical insights into subsurface processes and potential hazards. Here we present Sentinel‐1 Interferometric Synthetic Aperture Radar (InSAR) time series (2015–2020) for Changbaishan volcano, the largest intraplate volcanic system in East Asia. We detect persistent subsidence of up to 3.5 mm/yr
Xingjun Luo +3 more
wiley +1 more source
Altitude Dependence of Quasi‐Static Potential Drop: The Effect of Ionospheric Protons
Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.Abstract Using an improved kinetic model that incorporates cold ionospheric protons and oxygen ions, we investigate the factors controlling the altitude range of the auroral acceleration region (AAR). In this model, parallel electric fields are generated via Dispersive Alfven Wave‐ Modified electron Acoustic Wave (DAW‐MEAW) coupling and sustained by ...
Run Shi +4 more
wiley +1 more source
On the Feasibility of Interhemispheric Patch Detection Using Ground-Based GNSS Measurements
Remote Sensing, 2018 Dual-frequency GNSS data processing is currently one of the most useful techniques for sounding the ionosphere. Hence, this work was aimed at the evaluation of ground-based GNSS data for the continuous monitoring of polar patches in both hemispheres.
Rafal Sieradzki, Jacek Paziewski
doaj +1 more source
The Influence of the Cosmic Ray Forbush Decrease on the Low Ionosphere in the Polar Region [PDF]
, 1993 Used the ionization theory of the cosmic ray charged particles in the polar ionosphere, the influence of the cosmic ray Forbush decrease on the low ionosphere in the polar region is studied in this paper. The relationship between the Forbush decrease and
Xiaowei, Ye +3 more
core +1 more source
Dust Plumes Induced by a Time‐Varying Electron Beam
Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.Abstract We present laboratory results to address dust charging and lofting on the Moon and other airless planetary bodies in response to time‐varying solar wind and ultraviolet (UV) exposure. In these experiments, dust is exposed to an electron beam that varies in beam energy between 40 and 260 eV as a function of time.
A. Cabra, X. Wang, M. Horányi
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.Abstract The upper thermosphere is important in the context of space weather, but continuous monitoring of the thermosphere at high latitudes remains limited despite its strong variations associated with geomagnetic activity. Orthohelium, He(23S), is found from the upper thermosphere to lower exosphere, and is a promising tracer of atmospheric dynamics.
Takanori Nishiyama +6 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.Abstract During a 2023 field campaign, a NASA ER‐2 research aircraft intercepted an upward jet‐like electrical discharge at 20 km altitude over an intense tropical thunderstorm. This event was analyzed using airborne multispectral optical sensors, electric field mills, X‐band radar, passive microwave, and ground‐based radio networks.
T. J. Lang +19 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.Abstract Along the flank magnetopause, magnetosheath flow interfaced with the relatively stationary magnetosphere produces strong flow shears, and the Kelvin‐Helmholtz instability (KHI) occurs. When the interplanetary magnetic field (IMF) is southward, anti‐parallel day‐side reconnection and KHI can interact, which may enhance the reconnection rate as ...
Brandon L. Burkholder +7 more
wiley +1 more source