Results 61 to 70 of about 71,360 (201)

Longitudinal Variation of Ionospheric Irregularities and Response of the Ionosphere During 10–13 May and 10–13 October 2024 Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We examine the response of the ionosphere to the 10–13 May 2024 and 10–13 October 2024 geomagnetic storms, the two recent great geomagnetic storms of solar cycle 25. We identified the occurrence of ionospheric irregularities during the two geomagnetic storms.
Valence Habyarimana, Mark B. Moldwin, John Bosco Habarulema, Sharon Aol, Jean Claude Uwamahoro, Teshome Dugassa, Daniel Okoh, Solomon Otoo Lomotey   +7 more
wiley   +1 more source

IMF By and Dipole Tilt Control of the Auroral Cusp and Electron Aurora in the Dayside Polar Cap During Multiple Transpolar Arcs—A Statistical Study

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract It is well‐known that the auroral cusp appears poleward of the dayside oval during northward IMF, and that transpolar arcs (TPAs) are typically cusp‐aligned. Using Lyman‐Birge‐Hopfield band short (LBHs) images from the Defense Meteorological Satellite Program, we investigate electron aurora that occur approximately in the same region as the ...
Anita Kullen, M. C. Katrougkalou, C. Holmen, S. Thor, L. Cai, L. Roth, Y. Zhang   +6 more
wiley   +1 more source

Investigating the Leptokurtotic Nature of Low‐Latitude GNSS Scintillations With a Multiscale Approach

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We investigate the statistical nature of Global Navigation Satellite System (GNSS) signal fluctuations through the multiscale analysis of a strong scintillation event recorded at the Ionospheric Observatory of the Luigi Broglio Space Center in Malindi, Kenya.
L. Spogli, K. Meziane, P. T. Jayachandran, E. Pica, A. Cicone, L. Alfonsi   +5 more
wiley   +1 more source

Daily ionospheric forecasting service (DIFS) III [PDF]

Annales Geophysicae, 2005
The daily variability of the ionosphere can greatly affect HF or SATCOM communications. HF skywave operators plan frequency schedules months in advance, however, they also require daily knowledge of the ionospheric conditions in order to modify ...
N. Butcher
doaj   +1 more source

Assessing GNSS Reflectometry for High‐Latitude 3D Ionospheric Imaging

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract This study investigates whether Global Navigation Satellite System Reflectometry (GNSS‐R) measurements from low‐Earth‐orbit (LEO) satellites can improve three‐dimensional (3D) ionospheric electron density imaging, with a focus on high‐latitude regions. Conventional ionospheric tomography is limited by sparse ground‐based receiver coverage over
Brenna Royersmith, Brian Breitsch, Jade Y. Morton   +2 more
wiley   +1 more source

Dayside Polar Cap Aurora and Their Connection to NBZ Currents

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract During northward interplanetary magnetic field (IMF) conditions, magnetic reconnection between the Earth's magnetosphere and the IMF takes place on high latitudes, causing the auroral oval to contract. During those times several auroral structures may appear inside the polar cap, such as cusp aurora, high latitude dayside aurora (HiLDA) and ...
Maria Chloi Katrougkalou, Anita Kullen, Lei Cai, Lorenz Roth, Yongliang Zhang   +4 more
wiley   +1 more source

Tackling ionospheric scintillation threat to GNSS in Latin America [PDF]

, 2011
Scintillations are rapid fluctuations in the phase and amplitude of transionospheric radio signals which are caused by small-scale plasma density irregularities in the ionosphere.
Aquino, M., Spogli, L., Elcia Ferreira Da Silva, Forte, Biagio, Romano, V., Romano, Vincenzo, Forte, B., Wernik, A W, Vincenzo Romano, Sleewaegen, J-M, Alfonsi, Lu., Alfonsi, L, Bougard, Bruno, De Franceschi, Giorgiana, Sleewaegen, Jean-Marie, Craig Hancock, Lucilla Alfonsi, Elmas, Z., Spogli, L, Romano, V, Aquino, Marcio, Andrzej W. Wernik, De Franceschi, G., Canto, A, Bruno Bougard, Hancock, Craig, Galera Monico, J. F., Giorgiana De Franceschi, Galera Monico, Joao Francisco, Alfonsi, Lucilla, Canto´, A., Galera Monico, Joao Francisco [UNESP], Luca Spogli, Da Silva, E. F., Monico, Joao F G, Veettil Sreeja, V., Andrea Cantó, Sreeja, Vadakke Veettil, Wernik, Andrzej W., Zeynep Elmas, Jean-Marie Sleewaegen, Hancock, C., Marcio Aquino, Sleewaegen, J. M., Bougard, B., Joao Francisco Galera Monico, Biagio Forte, Canto, Andrea, Wernik, A. W., Da Silva, Elcia F, Da Silva, Elcia Ferreira, Aquino, M, Elmas, Zeynep, Spogli, Luca, Vadakke Veettil Sreeja   +54 more
core   +1 more source

A Multi‐Event Comparison of dB/dt Resulting From Omega Band Aurora

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Omega bands are an auroral form occurring in the dawn sector which cause magnetic perturbations on the ground as they drift eastwards. If these changes in the magnetic field are large, omega bands can become a space weather hazard as the corresponding geomagnetically induced currents have the potential to cause damage to ground based ...
R. M. Hodnett, S. E. Milan, S. K. Vines, J. W. Gjerloev, L. J. Paxton   +4 more
wiley   +1 more source

An Ionospheric Storm Scale Index Based on TEC: Comparative Analysis for China Region

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Defining a standardized ionospheric storm scale is challenging given the ionosphere's inherent complexity and susceptibility to multiple driving factors. In this study, a novel ionospheric storm scale (ISS) index is developed based on statistical analysis of total electron content (TEC) data from 257 ground‐based GNSS stations across China ...
Shuangshuang Shi, Yunfei Shi, Kefei Zhang, Bingfeng Tan, Fucheng Song, Peng Sun, Yu Li, Yifan Liu, Shouxing Zhao   +8 more
wiley   +1 more source

Ionospheric scintillation modeling II. Theoretical study of power spectral densities of ionospheric scintillation

Journal of Space Weather and Space Climate
An electromagnetic signal that has passed through a layer of ionospheric irregularities can undergo significant modifications. The Power Spectral Density (PSD) of such a signal can then be rich in information about the medium through which it has passed. Thus, this paper is dedicated to the theoretical study of the PSD of the log-amplitude and phase of
Grégory Morel, Vincent Fabbro, Olivier Boisot, Laurent Féral   +3 more
openaire   +1 more source