Effective electron recombination coefficient in ionospheric D-region during the relaxation regime after solar flare from February 18, 2011

Nina, Aleksandra; Čadež, V. M.; Šulić, D.; Srećković, Vladimir A.; Žigman, V. J.

doi:10.1016/j.nimb.2011.10.026

Cited by 26 publications

(20 citation statements)

References 6 publications

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“…Here, we see slow increases of this coefficient going to the unperturbed domain which are more visible at lower altitudes. Such a tendency is also found in [30]. The saturated values at the end of the relaxation time period are in a good agreement with those presented in literature ( [21], [31] and references within).…”

Section: Determination Of Initial Datasupporting

confidence: 92%

Ionospheric D-region temperature relaxation and its influences on radio signal propagation after solar X-flares occurrence

et al. 2015

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In this paper our attention is focused on relations between radio signal propagation characteristics and temperature changes in D-region after solar X-flare occurrence. We present temperature dependencies of electron plasma frequency, the parameter that describes medium conditions for propagation of an electromagnetic wave, and the refractive index which describes how this wave propagates. As an example for quantitative calculations based on obtained theoretical equations we choose the reaction of the D-region to the solar X-flare occurred on May 5 th , 2010. The ionospheric modelling is based on the experimental data obtained by low ionosphere observations using very low frequency radio signal.

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Section: Determination Of Initial Datasupporting

confidence: 92%

Ionospheric D-region temperature relaxation and its influences on radio signal propagation after solar X-flares occurrence

et al. 2015

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“…The VLF signals are being emitted continuously in time by a system of VLF transmitters distributed worldwide and, after being deflected from the ionosphere at heights below 90 km, they are recorded by networks of VLF receivers. The registered VLF wave variations in real time reflect the nonstationary physical and chemical conditions in perturbations in the medium along the VLF wave trajectories [ Nina et al , , ]. Namely, the VLF signal reflection hight depends on local electron density, and it is time dependent due to presence of perturbations [ Nina et al , ].…”

Section: Introductionmentioning

confidence: 99%

Detection of acoustic‐gravity waves in lower ionosphere by VLF radio waves

Nina

Čadež

2013

Geophysical Research Letters

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[1] We present a new method to study harmonic waves in the low ionosphere (60-90 km) by detecting their effects on reflection of very low frequency (VLF) radio waves. Our procedure is based on amplitude analysis of reflected VLF radio waves recorded in real time, which yields an insight into the dynamics of the ionosphere at heights where VLF radio waves are being reflected. The method was applied to perturbations induced by the solar terminator motions at sunrises and sunsets. The obtained results show that typical perturbation frequencies found to exist in higher regions of the atmosphere are also present in the lower ionosphere, which indicates a global nature of the considered oscillations. In our model atmosphere, they turn out to be the acoustic and gravity waves with comparatively short and long periods, respectively. Citation: Nina, A., and V. M.Čadež (2013), Detection of acoustic-gravity waves in lower ionosphere by VLF radio waves, Geophys. Res. Lett., 40,[4803][4804][4805][4806][4807]

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“…In this contribution we focus our attention to the analysis of amplitude and phase data, acquired by monitoring VLF/LF radio signals emitted by worldwide distributed transmitters during SIDs. All the data were recorded at a Belgrade site by two receiver systems: Absolute Phase and Amplitude Logger (AbsPAL) system (Nina, Čadež, Srećković, & Šulić, 2012a;Nina, Čadež, Šulić, Srećković, & Žigman, 2012b) and Atmospheric Weather Electromagnetic System for Observation Modeling and Education (AWESOME) 3 . The details of the receiving site are provided in the Table 1.…”

Section: Measured Datamentioning

confidence: 99%

The effects of solar activity: Electrons in the terrestrial lower ionosphere

Srećković¹,

Šulić²,

Vujčić³

et al. 2017

J GEOGR INST CVIJIC

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Solar flare X-ray energy can cause strong enhancements of the electron density in the Earth's atmosphere. This intense solar radiation and activity can cause sudden ionospheric disturbances (SIDs) and further create ground telecommunication interferences, blackouts as well as some natural disasters and caused considerable material damage. The focus of this contribution is on the study of these changes induced by solar X-ray flares using narrowband Very Low Frequency (VLF, 3-30 kHz) and Low Frequency (LF, 30-300 kHz) radio signal analysis. The model computation and simulation were applied to acquire the electron density enhancement induced by intense solar radiation. The obtained results confirmed the successful use of applied technique for detecting space weather phenomena such as solar explosive events as well for describing and modeling the ionospheric electron density which are important as the part of electric terrestrial-conductor environment through which external-solar wind (SW) electrons can pass and cause natural disasters on the ground like fires.

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Effective electron recombination coefficient in ionospheric D-region during the relaxation regime after solar flare from February 18, 2011

Cited by 26 publications

References 6 publications

Ionospheric D-region temperature relaxation and its influences on radio signal propagation after solar X-flares occurrence

Ionospheric D-region temperature relaxation and its influences on radio signal propagation after solar X-flares occurrence

Detection of acoustic‐gravity waves in lower ionosphere by VLF radio waves

The effects of solar activity: Electrons in the terrestrial lower ionosphere

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