Instability of the state of the night-time topside ionosphere

Ivanov, V. B.; Толстиков, М. В.

doi:10.1016/s1364-6826(03)00080-4

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…In section 3 we showed that we could separate three IGW types depending on their elevation angles: (1) IGWs propagating from the source lying under the observation heights; (2) IGWs propagating from the source lying under the observation heights IGWs and reflected from a region above the observation heights; and (3) IGWs propagating from the source lying above the observation heights (this source could be connected with different plasma instabilities in topside ionosphere; one of such instabilities was considered by Ivanov and Tolstikov []). Figure shows the azimuth distributions for all three types of IGWs.…”

Section: Discussion Of Azimuth Anisotropymentioning

confidence: 99%

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Relation of internal gravity wave anisotropy with neutral wind characteristics in the upper atmosphere

et al. 2017

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This paper studies the interaction of internal gravity waves (IGW) with neutral wind using the statistics of traveling ionospheric disturbances (TID) from the Radio Physical Complex of the Institute of Solar‐Terrestrial Physics. The complex includes the Irkutsk Incoherent Scatter Radar (IISR), Irkutsk Ionosonde (DPS‐4), and Ekaterinburg HF Radar (EKB). The aim of this study is to give a common explanation for the TID azimuth distributions obtained with the IISR‐ionosonde and HF coherent radar and show that the measurements of 3‐D TID characteristics put into the hands of researchers an important tool to study neutral wind in the thermosphere. The distinctive features of this study are the following: (1) using different TID statistics from independent tools and, correspondingly, independent methods for determining TID characteristics; (2) using the 3‐D TID characteristics for testing the wind‐filtering hypothesis, which allows us to separate the IGW‐induced TIDs from TIDs of other nature and identify three TID types depending on their elevation angles; and (3) using the local time‐azimuth distribution of the TID number for testing the wind‐filtering hypothesis. This study allowed us to conclude that the observed IGW azimuth anisotropy can be mainly explained by the wind filtration mechanism with considering winds at 90–250 km heights. Using the 3‐D IGW characteristics allows us to estimate neutral wind parameters. Proposed methods are applicable for any tool which can obtain TID 3‐D characteristics. Using the proposed methods will enable us to organize a worldwide campaign to improve the existing neutral wind models.

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Section: Discussion Of Azimuth Anisotropymentioning

confidence: 99%

“…Journal of Geophysical Research: Space Physics 10.1002/2017JA024103 different plasma instabilities in topside ionosphere; one of such instabilities was considered by Ivanov and Tolstikov [2003]). Figure 10 shows the azimuth distributions for all three types of IGWs.…”

Section: 1002/2017ja024103mentioning

confidence: 99%

Relation of internal gravity wave anisotropy with neutral wind characteristics in the upper atmosphere

et al. 2017

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“…The higher the location of the electron-density maximum, the greater the spread F probability and the larger the disturbance amplitude in the region of the F -layer maximum (at night) [9]. There are two main types of spread F observed on the vertical sounding ionograms [10,11]: 1) altitude (range) spread, in which a low-frequency segment of the ionogram is diffuse, which impedes reckoning of the apparent altitude, but the critical frequencies can easily be determined;…”

Section: Initial Characteristicsmentioning

confidence: 99%

Non-great-circle propagation modes on the high-latitude HF radio path

Blagoveshchensky

Борисова

Калишин

2009

Radiophys Quantum El

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We consider characteristics of the non-great-circle signals on the Murmansk-St. Petersburg oblique sounding path with a distance of 1050 km. The path crosses the main ionospheric trough and is highly influenced by the trough's polar wall and the boundary of diffuse precipitations. Field-aligned ionospheric irregularities and ionization gradients are often observed in this area. The data analysis was performed for quiet, moderately disturbed, and strongly disturbed conditions and for different local times. The main results are as follows. Non-great-circle signals in the form of scattered waves mostly occur in the nighttime hours. The nighttime non-great-circle signals always appear under both quiet and disturbed conditions, while the signals reflected from the ionization gradients appear at any local time during the disturbed periods (storms, substorms). Non-great-circle signals with intense reflections from the ionization gradients are most often observed during a moderate disturbance, especially in the nighttime hours. The ray-tracing model of non-great-circle propagation shows that the calculated oblique sounding ionograms generally coincide with the experimental ones.

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