Results 41 to 50 of about 178 (93)

The Evolution of a Polar Cap Patch Into a Blob in the Nightside Ionosphere: Direct Observations of Multiple Blob Formation Mechanisms Acting Simultaneously on the Same Plasma

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract A polar cap patch was observed to exit the polar cap to become a blob as it entered the auroral oval on the nightside of the Earth under moderately quiet geomagnetic conditions (Kp = 3−). Auroral particle precipitation led to an increase in the electron density of the blob.
S. J. Maguire, A. G. Wood, D. R. Themens, E. M. Henley, S. E. Milan, Y. Soobiah, K. Oksavik, W. J. Miloch, J. C. Coxon, M. G. Johnsen   +9 more
wiley   +1 more source

SAMI3 data in netCDF format (2019-Apr-15)

, 2023
SAMI3 (Sami3 is Also a Model of the Ionosphere) is a seamless, three-dimensional, physics-based model of the ionosphere (Huba et al, 2008). It is based on SAMI2, a two-dimensional model of the ionosphere (Huba et al., 2000).
Huba, Joseph, Chartier, Alex T., Steele, Josh   +2 more
core   +1 more source

Seasonal variability of horizontal neutral wind in the Baikal Region from Fabry—Perot interferometer observations and different versions of HWM

Solar-Terrestrial Physics
This study is based on observations of the atomic oxygen airglow emission at 630 nm obtained with a Fabry—Perot interferometer (FPI) of the National Heliogeophysical Complex.
Budovkina Aleksandra, Edemsky Ilya, Vasilyev Roman, Artamonov Maksim   +3 more
doaj   +1 more source

On the Seeding of Equatorial Plasma Bubbles by Longitudinal Variations in the Meridional Wind

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract We report results from SAMI3/WACCM‐X simulations that small‐scale (∼ ${\sim} $few 100 km) longitudinal variations in the meridional wind provide seeds to initiate equatorial plasma bubbles (EPBs). The meridional wind variations generate variations in the ion density along the magnetic field via ion‐neutral collisions.
J. D. Huba, N. Pedatella, H.‐L. Liu
wiley   +1 more source

Quantification of Representation Error in the Neutral Winds and Ion Drifts Using Data Assimilation

Space Weather
In this work we quantify the representation error of the algorithm Estimating Model Parameters from Ionospheric Reverse Engineering (EMPIRE), which estimates global neutral winds and ion drifts given time‐varying plasma densities. SAMI3 (Sami3 is A Model
Jiahui Hu, Aurora López Rubio, Alex Chartier, Sarah McDonald, Seebany Datta‐Barua   +4 more
doaj   +1 more source

Low-Latitude Ionospheric Disturbances and EIA Expansion During Consecutive Geomagnetic Storms in November 2025 Using BDS-GEO Satellites over the Eastern Hemisphere

Remote Sensing
This study investigates the low-latitude ionospheric response over the Eastern Hemisphere during two successive geomagnetic storms on 12–13 November 2025.
Shuqiong Liu, Xinyuan Jiang, Hanyang Teng   +2 more
doaj   +1 more source

Simultaneous Observations of Quasi‐Orthogonal Nighttime MSTIDs at Conjugate African‐European Midlatitude Stations on 4 October 2018

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract Two quasi‐orthogonal nighttime medium‐scale traveling ionospheric disturbances (MSTIDs) were observed by conjugate midlatitude all‐sky imagers in Sutherland (32.4° ${}^{\circ}$S, 20.8° ${}^{\circ}$E; magnetic latitude: ∼ ${\sim} $−40.9° ${}^{\circ}$) and Asiago (45.87° ${}^{\circ}$N, 11.53° ${}^{\circ}$E; magnetic latitude: ∼40.3° ${\sim} 40.3{
Zama T. Katamzi‐Joseph, Carlos Martinis, Jonathan J. Makela, Yuichi Otsuka, John Bosco Habarulema, Alicreance Hiyadutuje, Shai Toledano, Mark B. Moldwin, Jeffrey Baumgardner   +8 more
wiley   +1 more source

GRACE-FO radiation pressure modelling for accurate density and crosswind retrieval [PDF]

Uncertainties in radiation pressure modelling play a significant role in the thermospheric density and crosswind observations derived from the GRACE-FO accelerometer, especially during low solar activity.
Hładczuk, Natalia, Visser, P.N.A.M. (author), Kodikara, T. (author), Kodikara, Timothy, Siemes, Christian, Visser, Pieter, Siemes, C. (author), Hladczuk, N.A. (author), van den IJssel, J.A.A. (author), van den IJssel, Jose   +9 more
core   +1 more source

SAMI3 data in netCDF format (2019-Mar-15)

, 2023
SAMI3 (Sami3 is Also a Model of the Ionosphere) is a seamless, three-dimensional, physics-based model of the ionosphere (Huba et al, 2008). It is based on SAMI2, a two-dimensional model of the ionosphere (Huba et al., 2000).
Huba, Joseph, Chartier, Alex T., Steele, Josh   +2 more
core   +1 more source

Characteristics of Atmospheric Gravity Waves and Medium Scale Traveling Ionospheric Disturbances Derived From EISCAT Measurements

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract This study investigates the characteristics of medium scale traveling ionospheric disturbances (MSTIDs) relative amplitudes (δNe/Ne $\delta Ne/Ne$) in the ionospheric E to lower F regions, using the EISCAT VHF radar data measured from 41 daytime runs in years 2008–2024 carried out mostly between 7−13 $7-13$ UT.
Samson T. Moges, Thomas Ulich, Alexander Kozlovsky, Ruslan O. Sherstyukov, Sari Lasanen, Habtamu Tesfaw   +5 more
wiley   +1 more source