Results 71 to 80 of about 22,029 (223)

Magnetic Signatures of a Plasma Wake Behind the Swarm Satellites

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract This study provides first observational evidence of a plasma wake behind ESA's Swarm satellites, manifesting itself by a brief magnetic field strength spike and bipolar field variations in transverse direction. These magnetic signatures occur only near the dip‐equator where the magnetic declination is close to zero.
Chao Xiong, Xinyi Rang, Hermann Lühr, Fan Yin   +3 more
wiley   +1 more source

Classification of Ionograms Obtained from Vertical Incidence Pulsed Ionospheric Radar (VIPIR)/Dynasonde Ionospheric Radar at Jang Bogo Station, Antarctica

Journal of Astronomy and Space Sciences
The electron density profiles produced from the ionospheric sounding system are traditionally estimated by the inversion procedure based on the image analysis of the observed ionograms. Jang Bogo Vertical Incidence Pulsed Ionospheric Radar (VIPIR) with
Junho Back, Geonhwa Jee, Hyuck-Jin Kwon, Khan-Hyuk Kim, Changsup Lee, Young-Bae Ham, Nikolay Zabotin   +6 more
doaj   +1 more source

Localized electron density enhancements in the high-altitude polar ionosphere and their relationships with storm-enhanced density (SED) plumes and polar tongues of ionization (TOI) [PDF]

Annales Geophysicae, 2011
Events of localized electron density increase in the high-altitude (>3000 km) polar ionosphere are occasionally identified by the thermal plasma instruments on the Akebono satellite.
Y. Kitanoya, T. Abe, A. W. Yau, T. Hori, N. Nishitani   +4 more
doaj   +1 more source

Observations of High‐Resolution Two‐Dimensional Ionospheric Flow Dynamics Associated With Poleward Boundary Intensifications

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Poleward boundary intensifications (PBIs) are one of the most common auroral disturbances and have been shown to play a key role in substorm dynamics. PBIs are commonly interpreted as the ionospheric signature of magnetotail reconnection, providing insight into X‐line evolution.
Katherine Davidson, Yukitoshi Nishimura, Larry Lyons, Eric Donovan, Vassilis Angelopoulos, Nozomu Nishitani   +5 more
wiley   +1 more source

Influence of the Eccentric Geomagnetic Dipole on Longitude Variations of Compressional Upstream Wave Amplitudes in the Topside Ionosphere: Results From the MSS‐1A Satellite

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Based on 2‐year magnetic data from the Macau science satellite, we investigate the compressional Pc3‐4 pulsations (between 16 and 100 mHz) driven by upstream waves (UWs). Our results confirm larger UWs amplitudes in the South Atlantic Anomaly (SAA) longitudes, agreeing with previous missions.
Chao Xiong, Haibin Liu, Hermann Lühr, Chunyu Xu   +3 more
wiley   +1 more source

Data Assimilation Into a Machine Learning‐Based Emulator of a Global MHD Simulation for Analyzing the Polar Ionosphere

Space Weather
The temporal evolution of the polar ionosphere's electric field distribution can be simulated by a magnetohydrodynamic (MHD) model of the magnetosphere–ionosphere system.
Shin'ya Nakano, Sachin Alexander Reddy, Ryuho Kataoka, Aoi Nakamizo, Shigeru Fujita, Akira Sessai Yukimatu   +5 more
doaj   +1 more source

Impact of Non‐Classical Gravity‐Wave Dynamics on Middle‐Atmosphere Mean Flow and Solar Tides

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 8, 28 April 2026.
Abstract Conventional gravity‐wave (GW) parameterizations neglect three aspects of GW dynamics. Instead of momentum and entropy fluxes they use Eliassen‐Palm fluxes, thereby neglecting the possibility that resolved flow are not in geostrophic and hydrostatic balance.
T. Kühner, G. S. Völker, U. Achatz
wiley   +1 more source

Magnetopause Boundary Layers in Low Mach CME‐Driven Storm Environment

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Magnetopause boundary layers (BLs) play an important role mediating plasma and energy exchange between the solar wind/magnetosheath and Earth's magnetosphere. Energy exchange across the magnetopause is enhanced during storms, yet little work has been done investigating BLs during storms.
Rachel C. Rice, Li‐Jen Chen, Tai Phan, Brandon L. Burkholder, Stephen A. Fuselier, Roman Gomez, Cristian P. Ferradas, Jason M. H. Beedle, Megha Pandya   +8 more
wiley   +1 more source

Dayside ionospheric response to changes in IMF polarity: optical and plasma-flow observations [PDF]

Annales Geophysicae, 2000
The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic field was observed by two independent techniques. The signatures were seen in the 630.0 nm red-line emission, measured by a meridian scanning photometer at Ny-
S. E. Pryse, S. E. Pryse, S. E. Pryse, A. M. Smith, A. M. Smith, A. M. Smith, L. Kersley, L. Kersley, L. Kersley   +8 more
doaj   +1 more source

TEC enhancement due to energetic electrons above Taiwan and the West Pacific

, 2013
The energetic electrons of the inner radiation belt during a geomagnetic disturbance can penetrate in the forbidden range of drift shells located at the heights of the topside equatorial ionosphere (
Dmitriev, A. V., Suvorova, A. V., Tsai, L. -C.   +2 more
core   +3 more sources