Results 21 to 30 of about 452,012 (153)

Simultaneous HF measurements of E- and F-region Doppler velocity at large flow angles [PDF]

, 2004
International audienceData collected by the CUTLASS Finland HF radar are used to illustrate the significant difference between the cosine component of the plasma convection in the F-region and the Doppler velocity of the E-region coherent echoes observed
Koustov, A. V., Makarevitch, R. A., F. Honary, Honary, F., R. A. Makarevitch, A. V. Koustov   +5 more
core   +2 more sources

STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH [PDF]

Radio Physics and Radio Astronomy, 2020
Purpose: An experimental study of signatures of traveling ionospheric disturbances (TID) observed in diurnal-seasonal variations of the parameters of probe HF signals propagating on theoblique single-hop RWM–LFO radio path, derived from the yearlong ...
A. I. Reznychenko, A. V. Koloskov, A. O. Sopin, Y. M. Yampolski   +3 more
doaj   +1 more source

SPECTRAL ANALYSIS OF REFERENCE SIGNAL AND OF HF SIGNAL REFLECTED FROM THE IONOSPHERE BEATS

Radio Physics and Radio Astronomy, 2014
Topicality of this work is due to the necessity of studying the physical effects associated with the processes in the magnetosphere and the ionosphere. The HF Doppler radar of vertical sounding is used for observations.
V. F. Pushin, L. F. Chernogor
doaj   +1 more source

Parameters of traveling ionospheric disturbances: results from spaced oblique HF sounding

Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2022
Urgency. A characteristic feature of the ionospheric radio channel is that its parameters depend on season, local time, solar activity, geographic coordinates, the state of the sun, the state of atmospheric-space weather, etc. The state of the atmosphere
L. F. Chernogor, K. P. Garmash, Q. Guo, Y. H. Zhdanko, V. F. Pushin, A. M. Tsymbal, Yu. Zheng   +6 more
doaj   +1 more source

Continuous Doppler sounding of the ionosphere during solar flares

Earth, Planets and Space, 2018
Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electron densities in the ionosphere influences the
Jaroslav Chum, Jaroslav Urbář, Jan Laštovička, Miguel Angel Cabrera, Jann-Yenq Liu, Fernando Alberto Miranda Bonomi, Mariano Fagre, Jiří Fišer, Zbyšek Mošna   +8 more
doaj   +1 more source

Simultaneous observations of noctilucent clouds and polar mesosphere summer echoes at Syowa Station, Antarctica

Antarctic Record, 2013
This paper reports simultaneous observations of visible noctilucent clouds (NLC) and polar mesosphere summer echoes (PMSE) at Syowa Station (69°01′S, 38°61′E) in Antarctica. During a 1.5 h interval from 2000 to 2130 UT (2300 to 0030 LT) on Feb. 11, 2009,
Keisuke Hosokawa, Yasuo Takeda, Tadahiko Ogawa, Akira Kadokura, Akira Sessai Yukimatu, Natsuo Sato   +5 more
doaj   +1 more source

A PORTABLE HF RECEIVING COMPLEX FOR FREGUENCY-AND-ANGULAR SOUNDING OF THE IONOSPHERE

Radio Physics and Radio Astronomy, 2014
The paper presents the functional diagram and principle of operation of a portable HF receiving complex intended for measuring angles of arrival, Doppler frequency shifts and group time delays of probe signals used for remote radio sensing of the ...
V. G. Galushko, A. S. Kascheev, S. B. Kascheev, I. I. Pikulik, Y. M. Yampolski   +4 more
doaj   +1 more source

HF radar observations of high-aspect angle backscatter from the E-region [PDF]

Annales Geophysicae, 2004
We present evidence for the observation of high-aspect angle HF radar backscatter from the auroral electrojets, and describe the spectral characteristics of these echoes. Such backscatter is observed at very near ranges where ionospheric refraction is
S. E. Milan, M. Lester, T. K. Yeoman, T. R. Robinson, M. V. Uspensky, J.-P. Villain   +5 more
doaj   +1 more source

Ionospheric response to AGW propagation detected using GNSS measurements and coherent sounding over “Vernadsky” and “Palmer” Antarctic stations

Український антарктичний журнал, 2017
The work presents results of the diagnostics of travelling ionospheric disturbances (TIDs) over the Antarctic Peninsula obtained by using two different techniques. The first method is based on ground-based multi- positional GNSS TEC measurements, and the
A. A. Sopin, Yu. M. Yampolski, V. V. Paznukhov, S. B. Kascheev, A. V. Koloskov, I. I. Pikulik, A. V. Zalizovski, A. S. Kashcheyev   +7 more
doaj   +1 more source

Combinational frequencies of HF doppler radar signals in the PC1 geomagnetic pulsation range

Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2020
Urgency. The urgency of this work is determined by the necessity of studying MHD waves originating from various sources within the Earth–atmosphere–ionosphere– magnetosphere system and arriving at ionospheric heights. The object of research.
V. F. Pushin, L. F. Chernogor
doaj   +1 more source