Results 51 to 60 of about 348 (165)

Characteristics of Nighttime Medium‐Scale Traveling Ionospheric Disturbances: Longitudinal Comparison of Their Seasonal and Local Time Variations

Space Weather
This study presents a statistical analysis of the occurrence rate of midlatitude nighttime medium scale traveling ionospheric disturbances (MSTIDs) that were detected in Swarm plasma density measurements from 2014 to 2023.
Zama T. Katamzi‐Joseph, John Bosco Habarulema, Yuichi Otsuka, Tshimangadzo M. Matamba, Amoré E. Nel   +4 more
doaj   +1 more source

Climatology of Plasma Irregularities Using ROTI Index From 2008 to 2023 in East West Asia

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigates characteristics of ionospheric irregularities over the East–West Asian equatorial region using the Rate of TEC Index (ROTI) derived from Global Navigation Satellite System (GNSS) measurements. Data from four stations (GUAM, PIMO, CUSV, and IISC) were analyzed for 2008–2023, covering solar cycle (SC) 24 and the ascending
Pandit Drabindra, Fleury Rolland, Amory‐Mazaudier Christine   +2 more
wiley   +1 more source

Studies of medium scale travelling ionospheric disturbances using TIGER SuperDARN radar sea echo observations [PDF]

Annales Geophysicae, 2004
Seasonal and diurnal variations in the direction of propagation of medium-scale travelling ionospheric disturbances (MSTIDs) have been investigated by analyzing sea echo returns detected by the TIGER SuperDARN radar located in Tasmania (43.4° S, 147.
L.-S. He, L.-S. He, P. L. Dyson, M. L. Parkinson, W. Wan   +4 more
doaj   +1 more source

Rapid Evolution of Super Equatorial Plasma Bubbles and X‐Pattern EIA Formation During Extreme Storm Conditions on 12 November 2025

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Extreme conditions during storms profoundly alter the evolution of equatorial plasma bubbles (EPBs), yet the key dynamics remains poorly understood. We document the rapid expansion, contraction, and decay of super EPBs in South America during the 12 November 2025 storm with Interplanetary Magnetic Field (IMF) Bz/By magnitude exceeding ∼50 nT ...
Shasha Zou, Lei Liu, Hang Liu, Anthea Coster, Robert Kerr, Jonas Souza, Angela Santos   +6 more
wiley   +1 more source

First LiDAR Observation of Quasi‐Periodic Structures in Mid‐Latitude E‐Region Meteoric Ca+ Layers

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract We report the first LiDAR observations of continuous quasi‐periodic (QP) metal density structures in mid‐latitude E‐region meteoric Ca+ layers using an all‐solid‐state LiDAR system in Beijing (40.4°N, 116.0°E). These QP Ca+ structures, with periods of 2–30 min and vertical wavelengths of ∼2–15 km, were primarily observed above 100 km.
Jixin Guo, Tao Yu, Lifang Du, Jin Wang, Xiangxiang Yan, Yan Yu, Wenyu Hao, Yifan Qi, Haoran Zheng, Guotao Yang   +9 more
wiley   +1 more source

Northward-propagating nighttime medium-scale traveling ionospheric disturbances observed with SuperDARN Hokkaido HF radar and GEONET [PDF]

, 2013
We report on the characteristics of nighttime medium-scale traveling ionospheric disturbances (MSTIDs) propagating northward observed with the SuperDARN Hokkaido HF radar, which has a field of view to the north of Japan, and occasionally with the GNSS ...
Ichihara, Akimitsu, Nishitani, Nozomu, Ogawa, Tadahiko, Tsugawa, Takuya   +3 more
core   +1 more source

Global GNSS Observation of Mesoscale Ionospheric Irregularities (2006–2024)

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Mesoscale ionospheric irregularities are statistically investigated using an unprecedented 19‐year long‐term global GNSS (Global Navigation Satellite System) TEC (total electron content) data set. These irregularities are represented by ionospheric fluctuations within a 5°× ${}^{\circ}\times $ 3.75° ${}^{\circ}$ (latitude by longitude) region ...
Shun‐Rong Zhang, Jing Liu, Anthea J. Coster, Sevag Derghazarian, Philip J. Erickson, Larisa P. Goncharenko, Nestor Aponte, William Rideout   +7 more
wiley   +1 more source

C/NOFS observations of electromagnetic coupling between magnetically conjugate MSTID structures [PDF]

Journal of Geophysical Research: Space Physics, 2016
AbstractThis report demonstrates empirically that couplings between magnetically conjugate medium‐scale traveling ionospheric disturbances (MSTIDs) are electromagnetic in nature. This is accomplished by comparing plasma density, electric, and magnetic perturbations sampled simultaneously by sensors on the Communication/Navigation Outage Forecasting ...
W. J. Burke, C. R. Martinis, P. C. Lai, L. C. Gentile, C. Sullivan, R. F. Pfaff   +5 more
openaire   +1 more source

A Survey of Atmospheric Gravity Waves Observed by GOLD During Quiet to Moderate Solar and Geomagnetic Activity

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract Atmospheric gravity waves (GWs) are believed to transport energy and momentum between different regions of the atmosphere. Historically, observations of these waves from both ground and space have been relatively abundant at altitudes up to the lower thermosphere, and somewhat less abundant in the upper thermosphere and F‐region ionosphere ...
Scott L. England, Shun‐Rong Zhang, Scott Evans, Richard W. Eastes   +3 more
wiley   +1 more source

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

, 2018
Near‐continuous electron density measurements obtained over a ∼3 year period, 2010–2013, using the Poker Flat Incoherent Scatter Radar (PFISR) in central Alaska (69°N, 147°W) have been analyzed to quantify the properties of over 650 high‐latitude medium ...
S. L. Vadas, M. J. Taylor, Nielsen, Kim, K. Nielsen, Taylor, Michael J., M. R. Negale, Vadas, Sharon L., Negale, Michael R., Nicolls, M. J., Heinselman, Craig J., C. J. Heinselman, M. J. Nicolls   +11 more
core   +1 more source