Chemical physics of D and E layers of the ionosphere

Kuverova, V. V.; Адамсон, С. О.; Berlin, A. A.; Бычков, В. Л.; Дмитриев, А. В.; Dyakov, Yuri A.; Eppelbaum, Lev; Голубков, Г. В.; Lushnikov, A. A.; Манжелий, М. И.; Morozov, A. N.; Набиев, Ш. Ш.; Шаповалов, В. Л.; Suvorova, A. V.; Голубков, М. Г.

doi:10.1016/j.asr.2019.05.041

Cited by 34 publications

(29 citation statements)

References 51 publications

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“…It was shown [6][7][8] that, at altitudes from 60 to 110 km, the Sun flares produce a super background ultra high frequency UHF radiation with intensity hundreds of times higher the typical levels of microwave solar bursts. An analysis of the different mechanisms of generation of the detected radiation showed that the largest contribution to the resulting spectrum picture comes from the transitions between Rydberg states of the neutral components of a non-equilibrium two-temperature plasma excited by fluxes of sunlight and slow electrons penetrating in the low ionosphere [1][2][3][4]. Incoherent UHF radiation from Rydberg states during geomagnetic disturbances is accompanied earlier by an intense long-wave infrared (IR) radiation (with the wavelength exceeding 15 µm) [9].…”

Section: Passive Remote Sensing State Of Artmentioning

confidence: 99%

“…Incoherent UHF radiation from Rydberg states during geomagnetic disturbances is accompanied earlier by an intense long-wave infrared (IR) radiation (with the wavelength exceeding 15 µm) [9]. The analysis of the spectrum of this radiation allows for restoring the parameters of the two-temperature plasma (electron concentration and temperature) by solving the respective inverse problem [3].…”

Section: Passive Remote Sensing State Of Artmentioning

confidence: 99%

“…Passive remote sensing involves the use of natural radiation to determine the properties of the Earth's surface, which is usually carried out with receivers operating at a frequency of 1.4 GHz, since, at this frequency, there is a single-parameter dependence of the signal power on the electron concentration [3]. There is still no unique physical understanding among specialists regarding the source of radiation at a frequency of 1.4 GHz [2].…”

Section: Passive Remote Sensing State Of Artmentioning

confidence: 99%

“…Currently, considerable interest is given to the physicochemical processes, with the participation of electronically excited states taking place in the lower ionosphere of the Earth, which is primarily associated with the problems of remote passive location of the Earth's surface [1][2][3]. A spontaneous increase in solar activity accompanied by a significant increase in electromagnetic radiation leads to noticeable perturbations of the propagation medium.…”

Section: Introductionmentioning

confidence: 99%

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The Problems of Passive Remote Sensing of the Earth’s Surface in the Range of 1.2–1.6 GHz

et al. 2020

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The main problems of remote sensing of the Earth’s surface within the frequency range 1.2–1.6 GHz are discussed. They are related to the resonant quantum properties of the radio wave propagation medium in the lower ionosphere. It is shown that, for the passive remote sensing, the main source is incoherent microwave radiation of the D and E ionospheric layers in the decimeter range. For the first time, a theoretically grounded principally new scheme of measurements is suggested. The scheme assumes that the radiation source exists below the satellite orbit and accounts for the fact that two types of radiation (direct and reflected) reach the satellite sensor. The separation of the respective fluxes is a serious problem that should be solved for the correct interpretation of the measurements. The question is raised regarding the correct calibration of measuring equipment, depending on the current state of the ionosphere.

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Section: Passive Remote Sensing State Of Artmentioning

confidence: 99%

Section: Passive Remote Sensing State Of Artmentioning

confidence: 99%

Section: Passive Remote Sensing State Of Artmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Problems of Passive Remote Sensing of the Earth’s Surface in the Range of 1.2–1.6 GHz

et al. 2020

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“…Single point positioning (SPP) allows of the indication of an autonomous position of a receiver using code data from different Global Navigation Satellite Systems (GNSS). Code ranges are not ambiguous and do not require applying the precise method of ambiguity initialization (Bakuła, 2020;Cellmer et al, 2018;Kwaśniak et al, 2016;Nowel, et al, 2018). The principal problem of SPP stems from different types of errors degrading the Global Positioning System (GPS) signal between a rover and a specified satellite in a given epoch.…”

Section: Introductionmentioning

confidence: 99%

Single point positioning with vertical total electron content estimation based on single-epoch data

Fischer

Cellmer

Nowel

2021

Geosci. Instrum. Method. Data Syst.

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Abstract. This paper proposes a new mathematical method of ionospheric delay estimation in single point positioning (SPP) using a single-frequency receiver. The proposed approach focuses on the Δ vertical total electron content (VTEC) component estimation (MSPPwithdVTEC) with the assumption of an initial and constant value equal to 5 TECU in any observed epoch. The principal purpose of the study is to examine the reliability of this approach to become independent from the external data in the ionospheric correction calculation process. To verify the MSPPwithdVTEC, the SPP with the Klobuchar algorithm was employed as a reference model, utilizing the coefficients from the navigation message. Moreover, to specify the level of precision of the MSPPwithdVTEC, the SPP with the International Global Navigation Satellite Systems (GNSS) Service (IGS) TEC map was adopted for comparison as the high-quality product in the ionospheric delay determination. To perform the computational tests, real code data were involved from three different localizations in Scandinavia using two parallel days. The criterion was the ionospheric changes depending on geodetic latitude. Referring to the Klobuchar model, the MSPPwithdVTEC obtained a significant improvement of 15 %–25 % in the final SPP solutions. For the SPP approach employing the IGS TEC map and for the MSPPwithdVTEC, the difference in error reduction was not significant, and it did not exceed 1.0 % for the IGS TEC map. Therefore, the MSPPwithdVTEC can be assessed as an accurate SPP method based on error reduction value, close to the SPP approach with the IGS TEC map. The main advantage of the proposed approach is that it does not need external data.

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A simple semiempirical model for the static polarizability of electronically excited atoms and molecules

2023

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We present a semiempirical analytical model for the static polarizability of electronically excited atoms and molecules that requires very few readily accessible input data, including the ground-state polarizability, elemental composition, ionization potential, and spin multiplicities of excited and ground states. This very simple model formulated in a semiclassical framework is based on a number of observed trends in polarizability of electronically excited compounds. To adjust the model, both accurate theoretical predictions and reliable measurements previously reported elsewhere for a broad range of multielectron species in the gas phase are utilized. For some representative compounds of general concern that have not yet attracted sufficient research interest, the results of our multireference second-order perturbation theory calculations are additionally engaged. We show that the model we developed has reasonable (given the considerable uncertainties in the reference data) accuracy in predicting the static polarizability of electronically excited species of arbitrary size and excitation energy. These findings can be useful for many applications, where there is a need for inexpensive and quick assessments of the static gas-phase polarizability of excited electronic states, in particular, when building the complex nonequilibrium kinetic models to describe the observed optical refractivity (dielectric permittivity) of nonthermal reacting gas flows.

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Chemical physics of D and E layers of the ionosphere

Cited by 34 publications

References 51 publications

The Problems of Passive Remote Sensing of the Earth’s Surface in the Range of 1.2–1.6 GHz

The Problems of Passive Remote Sensing of the Earth’s Surface in the Range of 1.2–1.6 GHz

Single point positioning with vertical total electron content estimation based on single-epoch data

A simple semiempirical model for the static polarizability of electronically excited atoms and molecules

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