Results 61 to 70 of about 1,219 (180)

Evidence and Causes of an Unusual Super Plasma Bubble Occurrence During Weak Geomagnetic Conditions Over Europe

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Using data from a cluster of ground‐based global navigation satellite system, we observed spatially extended enhanced ROTI over the European longitudes during a weak geomagnetic storm (Dst ≈ ${\approx} $ −50 nT) on 4 November 2023. The enhanced ROTI is extended over an extensive geographical latitudinal range of 46°N.
Chandan Kapil, Mani Sivakandan, Jorge Chau, Gopi K. Seemala, David Altadill   +4 more
wiley   +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

Extra Ionization Causing the Anomalous Auroral Sporadic E Layer (Esa) Over the Equatorial Brazilian Region During the Recovery Phase of the Magnetic Storm on 10 May 2024

Space Weather, Volume 23, Issue 12, December 2025.
Abstract The center of the South American Magnetic Anomaly (SAMA), located in southern Brazil, is characterized by enhanced energetic particle precipitation (EPP) at low energies (<40 keV), which can significantly impact the ionosphere during intense geomagnetic storms.
L. C. A. Resende, Y. Zhu, R. A. J. Chagas, C. M. Denardini, K. V. S. Espinosa, S. S. Chen, L. A. Da Silva, L. R. Alves, J. Moro, S. R. Laranja, A. M. Santos, V. F. Andrioli, L. L. Campos, J. P. Marchezi, J. R. Costa, C. Wang, H. Li, Z. Liu   +17 more
wiley   +1 more source

The March and April 2023 ionospheric storms over Europe

Frontiers in Astronomy and Space Sciences
This paper presents a deep and comprehensive multi-instrumental analysis of two distinct ionospheric storms occurring in March and April 2023. We investigate the ionospheric response in the middle-latitudinal European region utilizing ionospheric ...
Zbyšek Mošna, Veronika Barta, Kitti Alexandra Berényi, Jens Mielich, Tobias Verhulst, Daniel Kouba, Jaroslav Urbář, Jaroslav Chum, Petra Koucká Knížová, Habtamu Marew, Kateřina Podolská, Rumiana Bojilova   +11 more
doaj   +1 more source

Simulation study of the interaction between large-amplitude HF radio waves and the ionosphere [PDF]

, 2006
The time evolution of a large-amplitude electromagnetic (EM) wave injected vertically into the overhead ionosphere is studied numerically. The EM wave has a carrier frequency of 5 MHz and is modulated as a Gaussian pulse with a width of approximately 0.1
B. Eliasson, B. Thidé, Blagoveshchenskaya, Carlson, Derblom, DuBois, Goertz, Goodman, Hunsucker, Leyser, Mjølhus, Perkins, Reinisch, Reinisch, Robinson, Silin, Stix, Thidé, Thidé, Thidé, Utlaut, Wong, Xi   +22 more
core   +2 more sources

HF Radar Observations and Modeling of the Impact of the 8 April 2024 Total Solar Eclipse on the Ionosphere‐Thermosphere System

Geophysical Research Letters
The path of totality of the 8 April 2024 solar eclipse traversed the fields‐of‐view of four US SuperDARN radars. This rare scenario provided an excellent opportunity to monitor the large‐scale ionospheric response to the eclipse.
B. S. R. Kunduri, J. B. H. Baker, J. M. Ruohoniemi, E. G. Thomas, J. D. Huba, D. J. Emmons, D. R. Themens, K. T. Sterne, G. Farinas Perez, W. A. Bristow, S. G. Shepherd, J. M. Holmes, E. V. Dao, A. T. Chartier, G. W. Perry, K. Pandey   +15 more
doaj   +1 more source

Scenedesmus biomass productivity and nutrient removal from wet market wastewater, a bio-kinetic study [PDF]

, 2018
The current study aims to investigate the production of microalgae biomass as a function for different wet market wastewater ratios (10, 25, 50, 75 and 100%) and Scenedesmus sp.
Abdul Latiff, Muhammad Abu Bakar, Aifat, Nor Rahman, Haris, Hidayah, Maryanto, Ibnu, Md Zain, Badrul Munir, Mohamed, Mohd Sanusi, Mohd Ridwan, Abd Rahman, Ramli, Farah Farhana, Sariyati, Nur Hartini, Sufahani, Suliadi Firdaus, Yaakop, Salmah   +10 more
core   +1 more source

Diurnal Variations of the Electron Density in the Nighttime Lower Ionosphere Derived From a Massive Data Set of Tweek Atmospherics

Earth and Space Science, Volume 12, Issue 11, November 2025.
Abstract Tweek atmospherics are ELF/VLF pulse signals with frequency dispersion characteristics that originate from lightning discharges. Previous research has employed tweek atmospherics to examine long‐term trends in the lower ionosphere; however, their utility in capturing diurnal‐scale variations has been largely unexplored.
Mao Zhang, Gaopeng Lu, Ziyi Wang, Zhengwei Cheng, Steven A. Cummer, Yazhou Chen   +5 more
wiley   +1 more source

Polar cap patches observed during the magnetic storm of November 2003: observations and modeling [PDF]

Annales Geophysicae, 2015
We present multi-instrumented measurements and multi-technique analysis of polar cap patches observed early during the recovery phase of the major magnetic storm of 20 November 2003 to investigate the origin of the polar cap patches. During this event,
C. E. Valladares, T. Pedersen, R. Sheehan   +2 more
doaj   +1 more source

Comment on “Evidence of Potential Thermospheric Overcooling During the May 2024 Geomagnetic Superstorm” by Kumar Ranjan et al.

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract The post‐storm neutral density ρ decrease (when it takes place) cannot be prescribed to a decrease in neutral temperature because this contradicts the observed negative foF2 deviations normally observed during the recovery storm phase. Neutral temperature decrease also contradicts empirical (based on observations) thermospheric models such as ...
Andrey V. Mikhailov, Loredana Perrone
wiley   +1 more source