Results 71 to 80 of about 166,062,727 (217)

Medium‐Scale Traveling Ionospheric Disturbances Induced by Secondary Gravity Waves Associated With Record‐Breaking Heavy Rainfall in August 2021 Over Kyushu, Japan

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract This study reconstructs a multistep gravity wave (GW) pathway, from the generation of primary GWs by deep convection in the troposphere to the generation of secondary GWs that drive semi‐concentric medium‐scale traveling ionospheric disturbances (MSTIDs) in the ionosphere, during the record‐breaking heavy rainfall over Kyushu, Japan, in August
Masaru Kogure, In‐Sun Song, Byeong‐Gwon Song, Huixin Liu, Michi Nishioka, Septi Perwitasari, Hosik Kam, Junseok Hong   +7 more
wiley   +1 more source

On the relationship between auroral absorption, electrojets currents and plasma convection [PDF]

, 2009
In this study, the relationship between auroral absorption, electrojet currents, and ionospheric plasma convection velocity is investigated using a series of new methods where temporal correlations are calculated and analysed for different events and ...
R. A. Makarevich, Makarevich, R. A., Kellerman, A.C., A. C. Kellerman, F. Honary, T. L. Hansen, Makarevich, R.A., Honary, F., Hansen, T.L., Hansen, Truls Lynne, Kellerman, A. C.   +10 more
core   +2 more sources

Effects of sudden commencement on the ionosphere: PFISR observations and global MHD simulation

Geophysical Research Letters, 2017
Sudden commencement (SC) induced by solar wind pressure enhancement can produce significant global impact on the coupled magnetosphere‐ionosphere (MI) system, and its effects have been studied extensively using ground magnetometers and coherent scatter ...
Shasha Zou, Dogacan Ozturk, Roger Varney, Ashton Reimer   +3 more
doaj   +1 more source

Solar wind Alfvén waves: a source of pulsed ionospheric convection and atmospheric gravity waves [PDF]

Annales Geophysicae, 2005
A case study of medium-scale travelling ionospheric disturbances (TIDs) that are correlated with solar wind Alfvén waves is presented. The HF radar ground-scatter signatures of TIDs caused by atmospheric gravity waves with periods of 20-40min are
P. Prikryl, D. B. Muldrew, G. J. Sofko, J. M. Ruohoniemi   +3 more
doaj   +1 more source

Cosmic Ray Anisotropy Generated by the June 22nd 2015 Interplanetary Events

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract On 22 June 2015, the near Earth interplanetary space was perturbed by a series of high‐speed streamers and interplanetary coronal mass ejections associated with an active region and two low‐latitude coronal holes. The interaction of these disturbances gave rise to the complex solar wind structure observed at 1 au.
A. Lara, K. P. Arunbabu, T. Niembro
wiley   +1 more source

Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere [PDF]

, 2005
International audienceExperimental results from three ionospheric HF pumping experiments in overdense E or F regions are summarized. The experiments were conducted by the use of the EISCAT HF Heating facility located near Tromsø, Norway, allowing HF ...
N. F. Blagoveshchenskaya, Bösinger, T., Rietveld, M. T., B. Thidé, Thidé, B., Borisova, T. D., T. D. Borisova, M. T. Rietveld, Kosch, M. J., V. A. Kornienko, M. J. Kosch, Blagoveshchenskaya, N. F., Kornienko, V. A., T. Bösinger   +13 more
core   +2 more sources

The VLF-induced ionospheric perturbations detected by DEMETER during solar minimum

Terrestrial, Atmospheric and Oceanic Sciences, 2023
The VLF-induced ionospheric heating events from the powerful transmitter NWC are collected at extremely low solar activity years of 2008–2009, and their spatial and temporal distribution features are investigated.
Xuemin Zhang, Lei Dong, Lei Nie
doaj   +1 more source

The Impacts of Tropospheric Gravity Wave‐Generated MSTIDs on Skywaves at Mid‐latitude North American Sector Observed and Modeled Using SuperDARN HF Radars

Radio Science, Volume 61, Issue 9, September 2026.
Abstract Trans‐ionospheric high frequency (HF: 3–30 MHz) response to atmospheric gravity waves (GWs) is studied in the middle‐latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW‐generated medium‐scale traveling ionospheric disturbances (MSTID ...
S. Chakraborty, P. A. Inchin, S. Debchoudhury, B. Bergsson, M. Zettergren, J. M. Ruohoniemi   +5 more
wiley   +1 more source

Artificial optical emissions at HAARP for pump frequencies near the third and second electron gyro-harmonic [PDF]

, 2005
International audienceHigh-power high-frequency radio waves beamed into the ionosphere cause plasma turbulence, which can accelerate electrons. These electrons collide with the F-layer neutral oxygen causing artificial optical emissions identical to ...
F. T. Djuth, T. Pedersen, A. Senior, Hughes, J., Gerken, E., E. Gerken, Marshall, R., Pedersen, T., Senior, A., McCarrick, M., R. Marshall, Djuth, F. T., Kosch, M. J., M. J. Kosch, D. Sentman, J. Hughes, M. McCarrick, Sentman, D.   +17 more
core   +2 more sources

New Swarm products NeGIX and TEGIX for monitoring horizontal ionospheric gradients

Journal of Space Weather and Space Climate
The detection, monitoring, and characterization of ionospheric perturbations are key areas of space weather research due to their significant impact on man-made technological systems.
Cahuasquí Juan Andrés, Hoque Mohammed Mainul, Jakowski Norbert, Buchert Stephan, Vasylyev Dmytro, Nykiel Grzegorz, David Paul, Tagargouste Youssef, Kriegel Martin, Berdermann Jens, Nielsen Klaus   +10 more
doaj   +1 more source