Results 81 to 90 of about 1,219 (180)

VARIABILITY OF IONOSPHERIC F2 REGION DUE TO SUDDEN STRATOSPHERIC WARMING EVENT OF 2017 [PDF]

Proceedings on Engineering Sciences
We analyzed the impact of minor Arctic sudden stratospheric warming (SSW) event of 2017 on the ionospheric F2 region, using Digisonde data from a low-mid latitude Indian station, Delhi (28.6°N, 77.2°E, 19.2°N geomagnetic latitude, 42.4°N dip).
Qadeer Ahmed, Anshul Singh , N. Praneetha , Ankit Gupta , Arti Bhardwaj , Puja Goel , Arun Kumar Upadhayaya   +6 more
doaj   +1 more source

Long-Term Observation of the Quasi-3-Hour Large-Scale Traveling Ionospheric Disturbances by the Oblique-Incidence Ionosonde Network in North China. [PDF]

Sensors (Basel), 2021
Zhang R, Chen G, Li Y, Zhang S, Gong W, He Z, Zhang M.   +6 more
europepmc   +1 more source

Middle-Scale Ionospheric Disturbances Observed by the Oblique-Incidence Ionosonde Detection Network in North China after the 2011 Tohoku Tsunamigenic Earthquake. [PDF]

Sensors (Basel), 2021
Wang J, Chen G, Yu T, Deng Z, Yan X, Yang N.   +5 more
europepmc   +1 more source

Vertical electron density profiles from digisonde ionograms. The average representative profile

Annals of Geophysics, 1996
Profile calculations from ionograms using the Huang-Reinisch technique arrive at a set of boundary values and coefficients that describe the profile.
B. W. Reinisch, X. Huang
doaj   +1 more source

Investigation of the possible relationship between the occurrences of atmospheric gravity waves and equatorial Spread-F. [PDF]

Heliyon, 2023
Olawepo AO, Olagunju OE, Ajani OV.
europepmc   +1 more source

A Method to Retrieve Aeronomic Parameters From Noontime Bottom‐Side Equatorial Ne(h) and Satellite Neutral Density Observations

Space Weather
A new method has been proposed to retrieve neutral composition ([O] [O2], [N2]), exospheric temperature (Tex), vertical ExB plasma drift, and total solar EUV flux (λ ≤ 1050Å) using Digisonde DPS‐4 daytime bottom‐side (≥200 km) Ne(h) profiles and ...
L. Perrone, A. V. Mikhailov
doaj   +1 more source

Correlation of Rate of TEC Index and Spread F over European Ionosondes

Atmosphere
One of the most popular indices for monitoring the occurrence and intensity of ionospheric L-band irregularities is the Rate of TEC Index (ROTI). Due to low TEC in the mid-latitude ionosphere, ROTI has received significantly less attention than the ...
Krishnendu Sekhar Paul, Mehdi Hasan Rafi, Haris Haralambous, Mohammad Golam Mostafa   +3 more
doaj   +1 more source

Night-Time Ionospheric Localized Enhancements (NILE) Observed in North America Following Geomagnetic Disturbances. [PDF]

J Geophys Res Space Phys, 2021
Chartier AT, Datta-Barua S, McDonald SE, Bust GS, Tate J, Goncharenko LP, Romeo G, Schaefer RK.   +7 more
europepmc   +1 more source

Вариации частоты foF2 среднеширотной ионосферы в течение двух циклов солнечной активности [PDF]

, 2013
Представлены результаты наблюдений ионосферы с помощью ионозонда “Базис” (Харьков) в течение двух циклов солнечной активности. Проведено их сравнение с данными дигизондов DPS-4 в Прухонице (Чехия) и Дурбесе (Бельгия), расположенных на близкой широтеThe ...
Емельянов, Л. Я., Кононенко, А. А.   +1 more
core  

D- and F-Region Ionospheric Response to the Severe Geomagnetic Storm of April 2023

Atmosphere
This study investigates the impact on the Earth’s ionosphere of a severe geomagnetic storm (Dst ∼ −212 nT) that began on 23 April 2023 at around 17:37 UT according to very low-frequency (VLF, 3–30 kHz) or low-frequency (LF, 30–300 kHz) radio signals and ...
Arnab Sen, Sujay Pal, Bakul Das, Sushanta K. Mondal   +3 more
doaj   +1 more source