Results 11 to 20 of about 301 (185)

ScintPi measurements of low-latitude ionospheric irregularity drifts using the spaced-receiver technique and SBAS signals [PDF]

open access: yesAtmospheric Measurement Techniques
Previous efforts have used pairs of closely spaced specialized receivers to measure Global Navigation Satellite System (GNSS) signals and to estimate ionospheric irregularity drifts.
J. Gomez Socola   +4 more
doaj   +1 more source

Machine Learning Prediction of Storm‐Time High‐Latitude Ionospheric Irregularities From GNSS‐Derived ROTI Maps

open access: yesGeophysical Research Letters, 2021
This study presents an image‐based convolutional long short‐term memory (convLSTM) machine learning algorithm to predict storm‐time ionospheric irregularities.
Lei Liu, Y. Jade Morton, Yunxiang Liu
doaj   +1 more source

Signature of ionospheric irregularities under different geophysical conditions on SBAS performance in the western African low-latitude region [PDF]

open access: yesAnnales Geophysicae, 2017
Rate of change of TEC (ROT) and its index (ROTI) are considered a good proxy to characterize the occurrence of ionospheric plasma irregularities like those observed after sunset at low latitudes.
O. E. Abe   +6 more
doaj   +1 more source

VHF/HF radio telecommunications between Syowa Station and Mizuho Station, Antarctica

open access: yesAntarctic Record, 1983
Radio telecommunication characteristics between Syowa Station and Mizuho Station were studied by using VHF radio wave scattered by ionospheric E-layer irregularity accompanied with aurora.
Kenrou Nozaki
doaj   +1 more source

New Index to Characterize Ionospheric Irregularity Distribution

open access: yesSpace Weather, 2023
Characterization of the global ionospheric irregularities as a function of local time, longitude, altitude, and magnetic activities is still a challenge for radio frequency operations, especially at the low‐latitude region.
Endawoke Yizengaw
doaj   +1 more source

Chinese ionospheric investigations in 2016–2017

open access: yesEarth and Planetary Physics, 2018
After the release of the previous report to the Committee on Space Research (COSPAR) on progress achieved by Chinese scientists in ionospheric researches (Liu LB and Wan WX, 2016), in the recent two years (2016–2017) many interesting new investigations ...
LiBo Liu, WeiXing Wan
doaj   +1 more source

Forcing From Lower Thermosphere and Quiet Time Scintillation Longitudinal Dependence

open access: yesSpace Weather, 2020
The quiet time ionospheric plasma bubbles that occur almost every day become a significant threat for radio frequency (RF) signal degradation that affects communication and navigation systems.
Endawoke Yizengaw, Keith Groves
doaj   +1 more source

On the factors controlling occurrence of F-region coherent echoes [PDF]

open access: yesAnnales Geophysicae, 2002
Several factors are known to control the HF echo occurrence rate, including electron density distribution in the ionosphere (affecting the propagation path of the radar wave), D-region radio wave absorption, and ionospheric irregularity intensity ...
D. W. Danskin   +10 more
doaj   +1 more source

Latitudinal and temporal variation of equatorial ionospheric irregularities determined from GPS scintillation observations [PDF]

open access: yesAnnales Geophysicae, 2006
In this paper we investigate the spatial and temporal distribution of ionospheric irregularities in the South-East Asian longitude sector by analysing the scintillation of GPS signals received at ground based stations. The data used for this work were
M. A. Cervera, R. M. Thomas
doaj   +1 more source

All‐Sky Interferometric Meteor Radar Observations of Zonal Structure and Drifts of Low‐Latitude Ionospheric E Region Irregularities

open access: yesEarth and Space Science, 2019
All‐sky interferometric meteor radar has been operated worldwide for the measurements of neutral winds in the mesopause region. In this paper, we employ an all‐sky meteor radar and an ionospheric radar, which are situated at Ledong (18.4°N,109°E) and ...
Ye Wang   +5 more
doaj   +1 more source

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