Results 61 to 70 of about 2,902 (228)

On the Peculiar Properties of Extremely Low Frequency Lightning Generated Whistlers Detected at Low Earth Orbit Altitudes Close to the Magnetic Equator

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Lightning strikes generate broadband electromagnetic signals. At Extremely Low Frequencies (ELF), these signals partly leak into the ionosphere and produce so‐called Lightning Generated (LG) whistlers that the Absolute Scalar Magnetometers on board the ESA Swarm satellites can detect.
M. Jenner, P. Coïsson, G. Hulot, L. Chauvet, R. Deborde   +4 more
wiley   +1 more source

Solar Flare Effects Observed over Mexico during 30–31 March 2022

Remote Sensing, 2023
Manifestations of two solar flares of March 2022 were studied over Mexico. The flare effects in the lower ionosphere had a ~3 min delay from the X1.3-flare onset and ~5 min from the M9.6-flare onset. The maximal impact on the HF signal amplitude was ~(14–
Maria A. Sergeeva, Olga A. Maltseva, Artem M. Vesnin, Donat V. Blagoveshchensky, Victor J. Gatica-Acevedo, J. Americo Gonzalez-Esparza, Aleksandr G. Chernov, Isaac D. Orrala-Legorreta, Angela Melgarejo-Morales, Luis Xavier Gonzalez, Mario Rodriguez-Martinez, Ernesto Aguilar-Rodriguez, Ernesto Andrade-Mascote, Pablo Villanueva   +13 more
doaj   +1 more source

Daytime Ionospheric F‐Region Topside Irregularities Associated With Significant Density Enhancement at Low Latitudes During the 12 November 2025 Magnetic Storm

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract In this study, daytime F‐region irregularities were observed at low latitudes during the main phase of the 12 November 2025 strong magnetic storm, causing intense very high frequency radar echoes ranging hundreds of kilometers in altitude.
Wenjie Sun, Guozhu Li, Guofeng Dai, Haiyong Xie, Lianhuan Hu, Biqiang Zhao, Zequan Wang, Jianfei Liu, Xiukuan Zhao, Yi Li, Baiqi Ning   +10 more
wiley   +1 more source

TGO Ramfjordmoen Ionosonde Data June 2015

, 2019
About this dataset: This dataset contains ionosonde data in SAO format and ionograms in PNG format, and covers data from June 01-30, 2015.About the Tromsø Ionosonde (1993-present): Since 1980, the ionosonde was situated at 69° 35' N, 19° 13' E at ...
Tromsø Geophysical Observatory
core   +1 more source

TGO Ramfjordmoen Ionosonde Data April 2022

, 2022
About this dataset: This dataset contains ionosonde data in SAO format and ionograms in PNG format, and covers data from April 01-30, 2022.About the Tromsø Ionosonde (1993-present): Since 1980, the ionosonde was situated at 69° 35' N, 19° 13' E at ...
Tromsø Geophysical Observatory
core   +1 more source

Direct Ionosonde Evidence of F‐Layer Disturbances Driven by Intense Lightning Activity at Low Latitudes

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Thunderstorms could cause the irregularities of electron density distributions in the ionosphere by exciting gravity waves and modifying ambient electric field (E‐field). By comparing the DPS‐4D ionosonde observation at 5‐min resolution at Fuke Station in Hainan, China with the lightning detection data, we studied the F‐layer responses to a ...
Zhengwei Cheng, Mao Zhang, Hailiang Huang, Guojun Wang, Zheng Wang, Sheping Shang, Xiao Wang, Maosheng He, Yajun Zhu, Hui Li, Yaoling Zhi, Gaopeng Lu   +11 more
wiley   +1 more source

TGO Ramfjordmoen Ionosonde Data January 1994

, 2019
About this dataset: This dataset contains ionosonde data in SAO format, and covers data from January 01-31, 1994.About the Tromsø Ionosonde (1993-present): Since 1980, the ionosonde was situated at 69° 35' N, 19° 13' E at Ramfjordmoen near Tromsø, Norway
Tromsø Geophysical Observatory
core   +1 more source

Drivers of Mid‐Latitude Quiet‐Time Longitude Variations in Ionospheric Density

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract The aim of this study is to provide an observational benchmark of mid‐latitude quiet‐time variability in winds, O/N2, and TEC across longitude and local time to provide a foundation for future model–data comparison studies. The quiet‐time ionospheric structure is not uniform but rather exhibits pronounced longitudinal and local‐time ...
K. R. Greer, L. P. Goncharenko, V. L. Harvey, C. Cullens   +3 more
wiley   +1 more source

TGO Ramfjordmoen Ionosonde Data November 2014

, 2019
About this dataset: This dataset contains ionosonde data in SAO format and ionograms in PNG format, and covers data from November 01-30, 2014.About the Tromsø Ionosonde (1993-present): Since 1980, the ionosonde was situated at 69° 35' N, 19° 13' E at ...
Tromsø Geophysical Observatory
core   +1 more source

Detection of Equatorial Plasma Bubbles Using the COSMIC‐2 Rate of TEC Index

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Equatorial plasma bubbles (EPBs) are large‐scale plasma depletion structures that can disrupt Global Navigation Satellite Systems (GNSS) and other space‐based technologies. Several instruments have been employed to study EPB dynamics, with Total Electron Content (TEC) and Rate of TEC change Index (ROTI) data standing out as valuable parameters
Ana L. Christovam, Fabricio S. Prol, Marcio T. A. H. Muella   +2 more
wiley   +1 more source