Results 1 to 10 of about 3,051 (167)

Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding [PDF]

Earth, Planets and Space, 2017
We analyzed horizontal velocities of medium-scale traveling ionospheric disturbances using HF Doppler sounding over Taiwan from January 2014 to January 2016.
Jiří Fišer, Jaroslav Chum, Jann-Yenq Liu   +2 more
doaj   +3 more sources

Simultaneous observations of equatorial plasma bubbles with an all-sky airglow imager and a HF Doppler sounding system in Taiwan

Earth, Planets and Space, 2023
High-Frequency Doppler (HFD) sounders at low-latitudes often detect characteristic oblique spreading Doppler traces in the spectrogram, known as Oblique Spread Structure (OSS).
Hiromi Sejima, Keisuke Hosokawa, Hiroyuki Nakata, Jaroslav Chum, Chien-Hung Lin, Jia-Ting Lin   +5 more
doaj   +2 more sources

Observations by the CUTLASS radar, HF Doppler, oblique ionospheric sounding, and TEC from GPS during a magnetic storm [PDF]

Annales Geophysicae, 2005
Multi-diagnostic observations, covering a significant area of northwest Europe, were made during the magnetic storm interval (28–29 April 2001) that occurred during the High Rate SolarMax IGS/GPS-campaign. HF radio observations were made with vertical
D. V. Blagoveshchensky, M. Lester, V. A. Kornienko, I. I. Shagimuratov, A. J. Stocker, E. M. Warrington   +5 more
doaj   +5 more sources

Ionospheric disturbances associated with the eruption of Mt. Asama observed by TEC data and HF Doppler sounding

Earth, Planets and Space
Mt. Asama, Nagano Prefecture, Japan, erupted at 11:02 UT on September 1st, 2004. Ionospheric disturbances associated with this eruption were detected using TEC data and HF Doppler observations. It has already been reported that the TEC data obtained from
Hiroyuki Nakata, Aritsugu Chonan, Keisuke Hosokawa, Takuya Tsugawa, Michi Nishioka, Hiroyo Ohya   +5 more
doaj   +2 more sources

A SYNTHESIS OF TEMPORAL VARIATIONS IN DOPPLER SPECTRA RECORDED AT A QUASI-VERTICAL INCIDENCE BY THE HF DOPPLER RADAR WITH SPACED RECEIVERS [PDF]

Radio Physics and Radio Astronomy, 2021
Purpose: The ionospheric channel is widely used for the communication, radio navigation, radar, direction finding, radio astronomy, and remote radio probing systems.
V. F. Pushin, L. F. Chernogor
doaj   +1 more source

Doppler shifts of HF radio waves along oblique propagation paths in the ionosphere

Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2023
Urgency. The ionosphere is widely used as a channel for radar, radioastronomy, radio navigation, communication links, and space-based  sounding the Earth.
L. F. Chernogor, Y. H. Zhdanko
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, Chen Zhou, Tongxin Liu, Jiandong Qiao, Wei Qiao, Chen Li, Junming Wang, Jianhua Zhu   +7 more
doaj   +1 more source

Ionospheric effects of the 5–6 January 2019 eclipse over the People's Republic of China: results from oblique sounding [PDF]

Annales Geophysicae, 2022
This paper deals with the variations in the Doppler spectra and in the relative amplitudes of the signals observed at oblique incidence over the People's Republic of China (PRC) during the partial solar eclipse of 5–6 January 2019 and on reference days ...
L. F. Chernogor, L. F. Chernogor, L. F. Chernogor, K. P. Garmash, Q. Guo, V. T. Rozumenko, Y. Zheng   +6 more
doaj   +1 more source

CHARACTERISTIC FEATURES OF VARIATIONS IN HF RADIO WAVE PARAMETERS IN THE IONOSPHERE DURING THE COURSE OF THE SOLAR ECLIPSE OF JUNE 21, 2020 OVER THE PEOPLE’S REPUBLIC OF CHINA [PDF]

Radio Physics and Radio Astronomy, 2022
Subject and Purpose. The study of the effect that each new Solar eclipse (SE) has on radio wave characteristics is an actual scientific and technical issue.
L. F. Chernogor, K. P. Garmash, Q. Guo, Y. Luo, V. T. Rozumenko, Y. Zheng   +5 more
doaj   +1 more source

Periodic oscillations of Doppler frequency excited by the traveling ionospheric disturbances associated with the Tonga eruption in 2022

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, Keisuke Hosokawa, Susumu Saito, Yuichi Otsuka, Ichoro Tomizawa   +4 more
doaj   +1 more source