A prototype of a portable coherent ionosonde

Zalizovski, A. V.; Kashcheyev, A.; KASHCHEYEV, S.B.; Koloskov, A. V.; Lisachenko, V. N.; Paznukhov, V.; Pikulik, I. I.; Sopin, A. O.; Yampolski, Yu. M.

doi:10.15407/knit2018.03.010

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…Thus, an increase in the diagnostic height (particularly, in the afternoon) should result in the decreasing detection probability of small-scale ionospheric irregularities. Figure 3a shows the median height-time diagram of plasma frequencies in February 2018, which has been calculated according to the data of a digital ionosonde (Zalizovski et al, 2018) located 45 km to south of Kharkiv (Figure 1). The black line indicates the effective reflection height of the sounding signal at frequency of 3,110 kHz.…”

Section: Resultsmentioning

confidence: 99%

“…The requirement to use a fixed frequency during the whole day is caused by the intention to prevent the jumps in reflection heights. To select the sounding frequency, we have analyzed the data of long-term measurements of the foF2 provided by the ionosonde (Zalizovski et al, 2018) installed near the town of Zmiiv, Kharkiv region (49.68°N, 36.29°E, see Figure 1), 45 km south of the transmitting position. As a result, the "winter" (3,211 kHz) and "summer" (3,777 kHz) sounding frequencies were chosen.…”

Section: Methodology Of Measurements and Data Processingmentioning

confidence: 99%

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Multi‐Position Facility for HF Doppler Sounding of Ionospheric Inhomogeneities in Ukraine

et al. 2021

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Traveling ionospheric disturbances (TIDs) were discovered long time ago (Hines, 1960;Hooke, 1968). Their propagation leads to variations in the parameters of radio signals propagating in the ionosphere. The TID parameters satisfy the dispersion equation for atmospheric gravity waves (AGWs) in the thermosphere (Hooke, 1977;Gershman et al., 1984;Gossard & Hooke, 1978) and hence TIDs represent the ionospheric plasma response to AGWs. Identification of TIDs with AGWs, in turn, makes possible studying AGWs by means of radio techniques. Traditionally, AGWs are separated into the small-, medium-and large-scale ranges according to horizontal wavelengths of ≤100, 100-1,000, and >1,000 km, respectively (Francis, 1975;Georges, 1968;Hocke & Schlegel, 1996). AGWs may be excited by a wide variety of natural and artificial sources. Some of these sources like earthquakes, volcanic eruptions, cyclones, hurricanes and other meteorological phenomena, powerful explosion and rocket launches (

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Section: Resultsmentioning

confidence: 99%

Section: Methodology Of Measurements and Data Processingmentioning

confidence: 99%

Multi‐Position Facility for HF Doppler Sounding of Ionospheric Inhomogeneities in Ukraine

et al. 2021

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“…The maximum plasma frequency foF2 is a direct characterization of the 𝐴𝐴𝑒𝑒 is in m −3 . A modern low power digital system also based on software defined radio technology and built using USRP hardware was installed in 2017 (Zalizovski et al, 2018).…”

Section: Data Processingmentioning

confidence: 99%

“…The maximum plasma frequency foF2 is a direct characterization of the background density since the two parameters are related with the well‐known relation,

{f}_{pe}=8.98\sqrt{{n}_{e}},

where plasma frequency

{f}_{pe}

is in MHz and electron density

{n}_{e}

is in m −3 . A modern low power digital system also based on software defined radio technology and built using USRP hardware was installed in 2017 (Zalizovski et al., 2018).…”

Section: Data Processingmentioning

confidence: 99%

Occurrence and Characteristics of Traveling Ionospheric Disturbances in the Antarctic Peninsula Region

et al. 2022

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A statistical picture of the occurrence and characteristics of Traveling Ionospheric Disturbances (TIDs) over the Antarctic Peninsula is established using Global Navigation Satellite System Total Electron Content and High Frequency sounding observations. The measured parameters of the majority of the disturbances allow classifying them as medium scale TIDs (MSTIDs). Overall, the observed climatology of ionospheric disturbances in the Antarctic Peninsula region varies significantly with the season and makes it possible to differentiate two major types of the disturbances: winter daytime and summer nighttime, based on their occurrence periods and characteristics. During the Antarctic summer period, the disturbances are present mainly during the nighttime and morning hours, when the background plasma density is at maximum (due to Weddell Sea Anomaly). These disturbances predominantly propagate northwestward and their occurrence probability is well correlated with the sporadic E layer observations, suggesting that these are electrified MSTIDs. During the winter, the TID events are almost exclusively observed during the daytime. The propagation direction of the disturbances during the daytime shows a strong correlation with the background neutral wind direction in the thermosphere. A possible mechanism for this effect is wind filtering of the Atmospheric Gravity Waves originating in the troposphere, which indicates that their source is in the lower atmosphere. The periods of the TIDs also significantly differ between the seasons. Wintertime TIDs have noticeably shorter periods (10–50 min) than those observed during other parts of the year (30–140 min), which also likely reflects the fact that the two types of TIDs are generated by different physical mechanisms.

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“…The first one is the IPS-42 ionosonde that has been used since 1982. A new portable Doppler ionosonde (Zalizovski et al, 2018) developed and manufactured in cooperation between the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine (IRA NASU) and the International Centre for Theoretical Physics (ICTP) was installed at Akademik Vernadsky station in April 2017 to support and extend existing ionospheric observations. Thus, since 2017 in addition to traditional ionograms, we have information about Doppler frequency shift (DFS) of reflected signals that permit us to estimate the vertical movement in the ionospheric layers.…”

Section: Ionospheric Sounding At the Akademik Vernadsky Stationmentioning

confidence: 99%

Variability of Weddell Sea ionospheric anomaly as deduced from observations at the Akademik Vernadsky station

Galushko

Stanisławska

Lisachenko

et al. 2021

UAJ

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Ionospheric Weddell Sea anomaly is an inversion of diurnal variation of the electron density in the ionosphere over Antarctic Peninsula, Weddell Sea, and neighbor territories observed during Antarctic summer. This paper aims at analyzing the reaction of the ionosphere during the Weddell Sea anomaly to changes in solar and geomagnetic activity as deduced from the data of vertical sounding of the ionosphere conducted at the Akademik Vernadsky station. The aim is achieved by comparing the monthly median values of the critical frequencies of the ionosphere (foF2) during Weddell Sea anomaly for the years of high and low solar activity; as well as by comparison of median December height-time diagrams (HT-diagrams) of foF2 calculated separately for the time intervals characterized by low or high levels of F10.7 and K indices for the period from 2007 till 2016. It was experimentally demonstrated that the Weddell Sea anomaly depends on the levels of solar ultraviolet flux and local K indices. The biggest nighttime maximum of ionization corresponds to low K indices and high values of F10.7. The most accurate inversion of diurnal variation of electron density in the F region is observed under the low values of K index and low F10.7 flux. The growth of geomagnetic activity decreases the nighttime ionization under both low and high levels of F10.7 fluxes and leads to a blur of the night maximum. Visible virtual heights of maximums increase together with F10.7 independently of the K index level. Blurring of the night maximum can be explained by destruction of the field of thermospheric winds supporting the nighttime anomaly, and/or by increasing role of plasma drifts in comparison with wind impact. The growth of visible virtual height of the nighttime maximum with increasing solar F10.7 flux could be explained by the gain of equatorward thermospheric wind with increasing solar ultraviolet flux that leads to growth of plasma upwelling effect. The Doppler frequency shift of the signals reflected from the ionosphere during nighttime in presence of the Weddell Sea anomaly is close to zero which could be explained by a stable F2 layer formed as a result of dynamic equilibrium between photochemical processes and upward plasma transport.

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A prototype of a portable coherent ionosonde

Cited by 13 publications

References 9 publications

Multi‐Position Facility for HF Doppler Sounding of Ionospheric Inhomogeneities in Ukraine

Multi‐Position Facility for HF Doppler Sounding of Ionospheric Inhomogeneities in Ukraine

Occurrence and Characteristics of Traveling Ionospheric Disturbances in the Antarctic Peninsula Region

Variability of Weddell Sea ionospheric anomaly as deduced from observations at the Akademik Vernadsky station

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