Results 51 to 60 of about 853 (193)

The response of the ionospheric peak electron density (NmF2) to solar activity)

, 2022
Die maximale ionosphärische Elektronendichte NmF2, die mit dem Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) Modell simuliert wurde, wurde zur Untersuchung der ionosphärischen Reaktion in Jahren mit geringer (2008) und hoher (2013) Sonnenaktivität verwendet.
Vaishnav, R., Jacobi, Ch., Schmölter, E., Berdermann, J., Codrescru, M., Dühnen, H.   +5 more
openaire   +1 more source

Global scale annual and semi-annual variations of daytime NmF2 in the high solar activity years [PDF]

, 2020
The annual and semi-annual variations of the ionosphere are investigated in the present paper by using the daytime F2 layer peak electron concentration (NmF2) observed at a global ionosonde network with 104 stations.
Weixing Wan, Biqiang Zhao, Tao Yu, Libo Liu   +3 more
core  

Physics‐Embedded Deep Learning Reveals the Memory Effect of Ionospheric Electron Density in Response to Solar EUV Forcing

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Precise characterization of the electron density profile is crucial for optimizing high frequency communications. Reconstruction models often assume an instantaneous ionospheric response to solar forcing or using time delays, neglecting the time‐integrated cumulative “memory effect” of plasma dynamics.
Hongwei Gong, Hanxian Fang, Die Duan, Chao Xiao, Jintai Li, Chenghao Li, Hongtao Huang, Ganming Ren, Chuyue Zhou, Han Wu   +9 more
wiley   +1 more source

NmF2 trends at low and mid latitudes for the recent solar minima and comparison with IRI-2012 model

, 2017
The ionospheric electron density peak (NmF2) is analyzed for the recent minima of solar activity for two mid-latitude stations, Rome (41.8°N, 12.5°E, geomagnetic latitude 41.7°N, Italy) and Gibilmanna (37.9°N, 14.0°E, geomagnetic latitude 37.6°N, Italy),
Perna, Luigi, Ezquer, Rodolfo, Cabrera, Miguel, Pezzopane, Michael, Baskaradas, James Arokiasami   +4 more
core   +2 more sources

Anomalies on Ionospheric Electron Density Before the 2024 Noto Peninsula Earthquake Using Oblique Ionosondes

Atmosphere
In order to investigate possible ionospheric anomalies before a magnitude 7.6 earthquake (EQ) in the Japanese Noto Peninsula on 1 January 2024, we used oblique ionosonde data sounding at Wakkanai and Yamagawa with an assumed one-hop reflection point (ORP)
Shih-Sian Yang, Yasuhide Hobara, Sudipta Sasmal, Stelios M. Potirakis, Masashi Hayakawa   +4 more
doaj   +1 more source

Comparison of model electron densities and temperatures with Millstone Hill observations during undisturbed periods and the geomagnetic storms of 16−23 March and 6−12 April 1990 [PDF]

Annales Geophysicae, 1997
Measurements of F-region electron density and temperature at Millstone Hill are compared with results from the IZMIRAN time-dependent mathematical model of the Earth's ionosphere and plasmasphere during the periods 16–23 March and 6–12 April 1990 ...
A. V. Pavlov, A. V. Pavlov, M. J. Buonsanto   +2 more
doaj   +1 more source

High Latitude Thermosphere and Ionosphere Density Response to the May 2024 Geomagnetic Storm Observed by the LLITED CubeSat Mission

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract The May 2024 G5 geomagnetic storm produced significant disturbances in the ionosphere and thermosphere, particularly at high latitudes. Using high‐resolution in situ ion and neutral density measurements from the NASA Low‐Latitude Ionosphere/Thermosphere Enhancements in Density (LLITED) CubeSat at 430 km altitude, this study documents notable ...
Diana J. Swanson, James H. Clemmons, Huixin Liu, Rebecca Bishop, Shantanab Debchoudhury, Aroh Barjatya, Asti Bhatt   +6 more
wiley   +1 more source

Influences of sudden stratospheric warmings on the ionosphere above Okinawa [PDF]

Atmospheric Chemistry and Physics
We analyzed the ionosonde observations from Okinawa (26.7° N, 128.1° E; magnetic latitude: 17.0° N) for the years from 1972 to 2023. Okinawa is in the northern low-latitude ionosphere, where the influences of sudden stratospheric warmings (SSWs) on the ...
K. Hocke, K. Hocke, W. Wang, W. Wang, G. Ma   +4 more
doaj   +1 more source

Quantifying Errors in the Midpoint Transform Applied to Oblique Ionograms

Radio Science, Volume 61, Issue 7, July 2026.
Abstract It is important to specify the state of the ionosphere for Over‐the‐Horizon communications and surveillance. Both vertical and oblique ionograms provide valuable data to this end. Oblique ionograms can probe the ionosphere in locations where it would be impractical to build a vertical ionosonde, but their measurements are not straightforward ...
Joe Hughes, L. J. Nickisch, Sergey Fridman, Gregory Bullock, Shawn Kraut, Matt Hogan, Victoriya Forsythe   +6 more
wiley   +1 more source

Assessment of Polar Ionospheric Observations by VIPIR/Dynasonde at Jang Bogo Station, Antarctica: Part 1—Ionospheric Densities

Remote Sensing, 2022
Vertical incidence pulsed ionospheric radar (VIPIR) has been operated to observe the polar ionosphere with Dynasonde analysis software at Jang Bogo Station (JBS), Antarctica, since 2017.
Eunsol Kim, Geonhwa Jee, Young-Bae Ham, Nikolay Zabotin, Changsup Lee, Hyuck-Jin Kwon, Junseok Hong, Jeong-Han Kim, Terence Bullett   +8 more
doaj   +1 more source