Results 11 to 20 of about 853 (193)
A New Empirical Model of NmF2 Based on CHAMP, GRACE, and COSMIC Radio Occultation [PDF]
Remote Sensing, 2019 To facilitate F2-layer peak density (NmF2) modeling, a nonlinear polynomial model approach based on global NmF2 observational data from ionospheric radio occultation (IRO) measurements onboard the CHAMP, GRACE, and COSMIC satellites, is presented in this
Zhendi Liu +5 more
doaj +8 more sources
Morphology of NmF2 nighttime increases in the Eurasian sector [PDF]
Annales Geophysicae, 2000 Abstract. A statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed using all available foF2 observations for the years ...
A. V. Mikhailov +7 more
core +9 more sources
On the Pre‐Magnetic Storm Signatures in NmF2 in Some Equatorial, Low‐ and Mid‐Latitude Stations [PDF]
Journal of Geophysical Research: Space Physics, 2021 AbstractIn this paper, the ionospheric quiet‐time disturbances otherwise known as Pre‐Magnetic Storm Signatures (PMS) have been studied using the F2‐layer peak electron density (NmF2) data obtained from 12 Digisonde/ionosonde stations distributed across equatorial, low and mid‐latitudes. The datasets used spans the years 2010–2012.
B. W. Joshua +3 more
openaire +4 more sources
Dependence of the Annual Asymmetry in NmF2 on Geomagnetic Latitude and Solar Activity
Geomagnetism and Aeronomy, 2021 The properties of the annual asymmetry in the electron density of the F2-layer maximum NmF2 at noon are analyzed based on the global empirical model of the F2-layer critical frequency median (SDMF2 model). As a characteristic of this asymmetry, we used the R index, i.e., the January/July ratio of the total (at a given and geomagnetically conjugate ...
Deminov M.G., Shubin V.N., Deminov R.G.
openaire +2 more sources
Remote Sensing, 2023 A growing number of SmallSat/CubeSat constellations with high-rate (50–100 Hz) global navigation satellite system radio occultations (GNSS-RO) as well as low-rate (1 Hz) precise orbit determination (GNSS-POD) limb-viewing capabilities provide ...
Nimalan Swarnalingam +3 more
doaj +2 more sources
Remote Sensing, 2019 With the accumulation of the ionospheric radio occultation (IRO) data observed by Global Navigation Satellite System (GNSS) occultation sounder (GNOS) onboard FengYun-3C (FY3C) satellite, it is possible to use GNOS IRO data for ionospheric climatology ...
Weihua Bai +18 more
doaj +2 more sources
The response of the ionospheric peak electron density (NmF2) to solar activity) [PDF]
, 2023 The ionospheric peak electron density NmF2, simulated with the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model was used to study the ionospheric response to solar flux in years of low (2008) and high (2013) solar activity.
Dühnen, H. +5 more
core +4 more sources
First ICON-FUV Nighttime NmF2 and hmF2 Comparison to Ground and Space-Based Measurements. [PDF]
J Geophys Res Space Phys, 2021 AbstractThe Far Ultra Violet (FUV) ultraviolet imager onboard the NASA‐ICON mission is dedicated to the observation and study of the ionosphere dynamics at mid and low latitudes. We compare density profiles provided by the ICON FUV instrument during nighttime with electron density profiles measured by the COSMIC‐2 constellation (C2) and ground‐based ...
Wautelet G +8 more
europepmc +6 more sources
Long-term changes in the dependence of NmF2 on EUV solar flux at Juliusruh
Research on the ionosphere and thermosphere has been conducted to investigate indications of the impact of climate change and other changes. Various studies have found long-term changes in different parameters of the ionosphere and thermosphere, which ...
Tan Jun Rios, Maria Gloria +2 more
openaire +2 more sources
Simulated east–west differences in F-region peak electron density at Far East mid-latitude region
Earth, Planets and Space, 2020 Using TIME3D-IGGCAS model, we simulated the east–west differences in F-region peak electron density (NmF2) in the Far East mid-latitude region near the longitudinal sectors with very clear zonal variations of geomagnetic declination, and mainly analyzed ...
Zhipeng Ren +5 more
doaj +1 more source