Results 31 to 40 of about 703 (173)

Comparison of Seasonal foEs and fbEs Occurrence Rates Derived from Global Digisonde Measurements [PDF]

, 2021
A global climatology of sporadic-E occurrence rates (ORs) based on ionosonde measurements is presented for the peak blanketing frequency, fbEs, and the ordinary mode peak frequency of the layer, foEs.
Nava, Omar A., Merriman, Dawn K., Dao, Eugene V., Emmons, Daniel J., II   +3 more
core   +2 more sources

Monitoring and investigating space weather effects with meridional chain of instruments in Yakutia: a brief overview

Solar-Terrestrial Physics, 2017
The Yakutsk Meridional Chain (YMC) of IKFIA SB RAS, located along the 190° magnetic meridian, is equipped with geophysical and radiophysical instruments for monitoring space weather in northeast-ern Russia.
Baishev D.G., Samsonov S.N., Moiseev A.V., Boroyev R.N., Stepanov A.E., Kozlov V.I., Korsakov A.A., Toropov A.A., Yoshikawa A., Yumoto K.   +9 more
doaj   +1 more source

Ionospheric Peak Parameters Retrieved from FY-3C Radio Occultation: A Statistical Comparison with Measurements from COSMIC RO and Digisondes Over the Globe

Remote Sensing, 2019
In this study, two ionospheric peak parameters (ICPs), NmF2 and hmF2, derived from the global navigation satellite system (GNSS) radio occultation (RO) ionospheric electron density profiles (EDPs) obtained by Feng-Yun 3C (FY-3C) mission are compared with
Han Wang, Jia Luo, Xiaohua Xu
doaj   +1 more source

A comparison of Ne (h) model profiles with ground-based and topside sounder observations

Annals of Geophysics, 2000
Monthly median empirical models IRI-95 and NeUoG were compared with incoherent scatter EISCAT and Millstone Hill observations as well as with El Arenosillo Digisonde N e (h) bottomside profiles.
V. K. Depuev, G. Miro, T. Y. Leschinskaya, A. V. Mikhailov   +3 more
doaj   +1 more source

One-step ahead prediction of foF2 using time series forecasting techniques [PDF]

Annales Geophysicae, 2005
In this paper the problem of one-step ahead prediction of the critical frequency (foF2) of the middle-latitude ionosphere, using time series forecasting methods, is considered.
K. Koutroumbas, A. Belehaki
doaj   +1 more source

Automated collection and dissemination of ionospheric data from the digisonde network [PDF]

Advances in Radio Science, 2005
Abstract. The growing demand for fast access to accurate ionospheric electron density profiles and ionospheric characteristics calls for efficient dissemination of data from the many ionosondes operating around the globe. The global digisonde network with over 70 stations takes advantage of the Internet to make many of these sounders remotely ...
B.W. Reinisch, I. A. Galkin, G. Khmyrov, A. Kozlov, D. Kitrosser   +4 more
openaire   +2 more sources

Diurnal, seasonal, annual, and semi-annual variations of ionospheric parameters at different latitudes in East Asian sector during ascending phase of solar activity

Solar-Terrestrial Physics, 2017
We analyzed ionospheric parameters including the critical frequency of the F2 layer (foF2), the peak height of the F2 layer (hmF2), and the scale height at hmF2 (HT) from 2006 to 2012 (ascending phase of solar activity) at Hainan (19.5° N, 109.1° E, MLat.
Wang Zheng, Shi Jiankui, Wang Guojun, Wang Xiao, Zherebtsov G.A., Romanova E.B., Ratovsky K.G., Polekh N.M.   +7 more
doaj   +1 more source

Case Studies on the Day‐to‐Day Variability in the Occurrence of Post‐Sunset Equatorial Spread F

Space Weather, 2022
The occurrence of post‐sunset equatorial spread F (ESF) is well understood to be associated with the evening pre‐reversal enhancement (PRE). Earlier studies have shown that when large datasets are examined, there is a significant correlation between the ...
B. Olugbon, E. O. Oyeyemi, A. Kashcheyev
doaj   +1 more source

Validation of Global Ionospheric Specification (GIS) Electron Density Measurements During Solar Minimum to Solar Maximum Under Quiet and Disturbed Geomagnetic Conditions

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Global Ionospheric Specification (GIS) three‐dimensional electron density profiles constructed by assimilating the line‐of‐sight total electron content (TEC) from global navigation satellite system (GNSS) radio occultation (RO) measurements by FORMOSAT‐7/COSMIC‐2 (F7/C2) and ground‐based receiver network from international GNSS service ...
P. K. Rajesh, C. H. Charles Lin, C. Y. Lin, T. Matsuo, H. Jin, S. Perwitasari, M. Nishioka, Chao‐Yen Chen   +7 more
wiley   +1 more source

Latitudinal Dependence of the Geomagnetic and Solar Activity Effect on Sporadic‐E Layer

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Based on the global COSMIC occultation data, the latitudinal dependence of the geomagnetic and solar activity effect on the sporadic‐E (Es) layer is statically investigated. At middle geomagnetic latitudes, Es occurrence rates generally decrease with increasing solar activity, except during winter and spring in the Southern Hemisphere.
Qiong Tang, Wenjun Liu, Yuqiang Zhang, Ren Zhang, Zhibin Yu   +4 more
wiley   +1 more source