Results 21 to 30 of about 93,595 (201)
The ionospheric response in the Brazilian sector during the super geomagnetic storm on 20 November 2003 [PDF]
Annales Geophysicae, 2007 A very intense geomagnetic storm (superstorm) began with storm sudden commencement (SSC) at 08:03 UT on 20 November 2003, as a result of the coronal mass ejection (CME) by sunspot 484 hurled into space on 18 November 2003.
F. Becker-Guedes +12 more
doaj +1 more source
Remote Sensing, 2022 This work proposes a new indirect method to detect the impact of solar flares on ionospheric sounding measurements, i.e., on the signal-to-noise ratio of ionospheric reflected radio signals. The method allows us to detect and characterize the ionospheric
Victor de Paula +4 more
doaj +1 more source
Solar-Terrestrial Physics, 2018 Backscatter ionospheric sounding (BIS) is a powerful tool for monitoring and predicting conditions of operation of HF communication systems. The BIS method is adopted to determine coverage areas of radio waves and maximum usable radio frequencies ...
Ponomarchuk S.N. +4 more
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INVERSION OF BACKSCATTER IONOGRAMS INTO QUASI-PARABOLIC IONOSPHERIC LAYER PARAMETERS
Solar-Terrestrial Physics, 2020 We present an inversion scheme of the backscatter signal leading edge into parameters of the quasi-parabolic electron density profile, which is based on the comparison of experimental and calculated minimum delays of scattered signals with corresponding ...
S.N. Ponomarchuk, M.S. Penzin
doaj +1 more source
Earth, Planets and Space, 2023 The explosive eruption of the Hunga Tonga-Hunga Ha’apai volcano on 15 January 2022 generated atmospheric waves traveling around the Earth, which caused ionospheric disturbances on various spatio-temporal scales.
Hiroyuki Nakata +4 more
doaj +1 more source
Assessment of GRAS Ionospheric Measurements for Ionospheric Model Assimilation
Remote Sensing, 2023 We conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products.
M. M. Hoque +8 more
doaj +1 more source
High-Frequency Channel Modeling Based on the Multi-Source Ionospheric Assimilation Model
Remote Sensing, 2022 In this paper, we explored how to more accurately predict the quality of high-frequency links and how to better research and improve the capabilities of high-frequency communication, reconnaissance, and positioning systems.
Mingjie Lv +7 more
doaj +1 more source
Digital radio and its application in the HF (2-30 MHz) band [PDF]
, 2004 The propagation environment at high frequencies (HF, 2-30 MHz) has a significant impact on the performance of radio systems (especially data communications).
Davies, Nigel Clement
core +6 more sources
An Integrated Technology of Ionospheric Backscatter Detection and Oblique Detection
IEEE Access, 2021 Traditional single ground-based ionospheric detection methods often fail to obtain accurately ionospheric parameter information due to the measurement errors of detection systems and inverse algorithms.
Peng Lou, Lixin Guo, Jing Feng, Na Wei
doaj +1 more source
The mechanism of mid-latitude Pi2 waves in the upper ionosphere as revealed by combined Doppler and magnetometer observations [PDF]
Annales Geophysicae, 2013 The interpretation of simultaneous ionospheric Doppler sounding and ground magnetometer observations of low-latitude Pi2 waves is revised. We compare the theoretical estimates of the ionospheric Doppler velocity for the same amplitude of the ground ...
V. A. Pilipenko +4 more
doaj +1 more source