Results 51 to 60 of about 1,563 (166)

Iterative and Steady Black Auroral Stripes and Their Possible Causality in Plasma‐Sheet Electron Distributions: Implications From Low‐Altitude Reimei Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Iterative black auroral stripes were identified in auroral images obtained by the low‐altitude microsatellite Reimei. These steady and narrow black stripes are a remarkable feature of diffuse auroras generated by energetic electrons precipitating at higher latitudes than pulsating auroras.
Masafumi Hirahara, Yusuke Ebihara, Mizuki Fukizawa, Takanori Nishiyama, Takeshi Sakanoi   +4 more
wiley   +1 more source

Investigation of Large Scale Traveling Atmospheric/Ionospheric Disturbances Using the Coupled SAMI3 and GITM Models

Geophysical Research Letters
We present simulation results of the vertical structure of Large Scale Traveling Ionospheric Disturbances (LSTIDs) during synthetic geomagnetic storms.
A. Bukowski, A. Ridley, J. D. Huba, C. Valladares, P. C. Anderson   +4 more
doaj   +1 more source

Study on Equatorial Bubbles Detected by SPS IMS Onboard the Kompsat-I [PDF]

Journal of Astronomy and Space Sciences, 2002
Space Physics Sensor onboard the KOMPSAT-1, which was launched at 1999, had transmitted ionospheric data during the solar maximum from June 2000 to August 2001.
Jaejeung Park, Jaejin Lee, Ensang Lee, Kyoung-Wook Min   +3 more
doaj   +1 more source

Height‐Dependent Evolution of the Ionospheric Response to the May 2024 Superstorm: Global GNSS‐POD, GNSS‐RO, and Ground‐Based Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Capturing global ionospheric response during extreme geomagnetic storms remains a major observational challenge. During 10–11 May, 2024 superstorm, we investigate the height‐dependent response of the F‐region using multi‐constellation GNSS‐POD limb‐sounding measurements from COSMIC‐2, Spire, PlanetiQ, and FengYun‐3 satellites. Approximately 12,
Nimalan Swarnalingam, Dong L. Wu, Daniel J. Emmons, Cornelius Csar Jude H. Salinas   +3 more
wiley   +1 more source

Thermal Structure of the Equatorial Topside Ionosphere [PDF]

, 1972
151-153The thermal structure of the equatorial topside ionosphere is theoretically investigated to explain the experimentally observed features, viz. (i) isothermal region in the 400-500 km range, (ii) close coupling of electron and ion temperatures, and
Singh, Risal, Rao, B. C. Narasinga
core  

Expansion and Shrinking of the Martian Topside Ionosphere

, 2019
The observations made by the Mars Atmosphere and Volatile EvolutioN spacecraft in the topside (≥200 km) ionosphere of Mars show that this region is very responsive to the variations of the external (solar extreme ultraviolet flux, solar wind, and ...
Dubinin, E., M. Pätzold, Zelenyi, L., J. E. P. Connerney, O. Vaisberg, Jakosky, B., Connerney, J., McFadden, J., Eparvier, F., L. Zelenyi, Halekas, J. S., M. Fraenz, J. Woch, Woch, J., Vaisberg, O., F. Eparvier, Pätzold, M., Connerney, J. E. P., Halekas, J., E. Dubinin, B. M. Jakosky, Fraenz, M., J. S. Halekas, Jakosky, B. M., J. McFadden, Fränz, M.   +25 more
core   +1 more source

Validation of NeQuick2 topside TEC using ESA Swarm GNSS data

Ain Shams Engineering Journal
Accurate topside ionosphere–plasmasphere modeling is vital for GNSS. Using Swarm GNSS data, topside TEC is derived to evaluate NeQuick2 from ∼460–20,200 km across solar activity, season, latitude, local time, and hemispheres.
Muhammad Mubasshir Shaikh
doaj   +1 more source

Gravity Wave Influences on MSTID Climatology Over CONUS: WACCM‐X Year‐Long Simulation and GNSS Long‐Term Observation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Medium‐Scale Traveling Ionospheric Disturbances (MSTIDs) are prominent wave‐like structures in the ionosphere, with complex generation mechanisms involving both atmospheric gravity waves (GWs) and electrodynamic instabilities such as the Perkins instability (PI).
Jing Liu, Shun‐Rong Zhang, Hanli Liu, Anthea J. Coster, Philip J. Erickson   +4 more
wiley   +1 more source

A Major Update to the PyIRI Model

Space Weather, Volume 24, Issue 6, June 2026.
Abstract This paper presents a major update to the PyIRI model, a fully vectorized Python implementation of the International Reference Ionosphere (IRI). The update reformulates the IRI core coefficients using spherical harmonics in Quasi‐Dipole (QD) latitude and Magnetic Local Time coordinates, replacing the legacy geographic‐coordinate‐based basis ...
Nina Servan‐Schreiber, Victoriya V. Forsythe, Meghan R. Burleigh, Kate A. Zawdie, Douglas P. Drob, Angeline G. Burrell, Joshua Semeter   +6 more
wiley   +1 more source

A Reduced Dimensional Emulator for Forecasting Equatorial Spread F

Space Weather, Volume 24, Issue 6, June 2026.
Abstract A machine learning emulator has been developed to efficiently reproduce electron densities from a three‐dimensional, data‐driven, regional simulation of postsunset ionospheric irregularities associated with equatorial spread F (ESF). The simulation has previously been shown to produce accurate ESF conditions observed at the Jicamarca Radio ...
A. Kirchman, D. L. Hysell, S. Palacios
wiley   +1 more source