TY  - JOUR
AU  - Petković, Dušan
AU  - Odalović, Oleg
AU  - Nina, Aleksandra
PY  - 2022
UR  - https://www.astro.sk/caosp/Eedition/Abstracts/2022/Vol_52/No_3/index.html
UR  - https://www.astro.sk/caosp/Eedition/Abstracts/2022/Vol_52/No_3/pp116-125_abstract.html
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2802
AB  - Recent research indicates that the influence of the ionospheric D-region on the propagation of satellite signals cannot be ignored during the intense X-radiation emitted during solar X-ray flares. In this paper, we investigate the influence of changes in the solar hydrogen Lya radiation, which is manifested in variations of the D-region electron density and, consequently, the total electron content in this region, on the propagation of the Global Navigation Satellite System (GNSS) signals. We consider changes during a solar cycle and year, represented by the smoothed daily sunspot number and the day of year. The obtained results indicate that the influence of the D-region on these signals is not negligible for positioning with a single signal recorded by a single receiver during the period around the maximum of a solar cycle.
PB  - Astronomical Institute of the Slovak Academy of Sciences
T2  - Contributions of the Astronomical Observatory Skalnate Pleso
T1  - Influence of the solar hydrogen Lya line on the GNSS signal delay in the ionospheric D-region
EP  - 125
IS  - 3
SP  - 116
VL  - 52
DO  - 10.31577/caosp.2022.52.3.116
ER  - 

@article{
author = "Petković, Dušan and Odalović, Oleg and Nina, Aleksandra",
year = "2022",
abstract = "Recent research indicates that the influence of the ionospheric D-region on the propagation of satellite signals cannot be ignored during the intense X-radiation emitted during solar X-ray flares. In this paper, we investigate the influence of changes in the solar hydrogen Lya radiation, which is manifested in variations of the D-region electron density and, consequently, the total electron content in this region, on the propagation of the Global Navigation Satellite System (GNSS) signals. We consider changes during a solar cycle and year, represented by the smoothed daily sunspot number and the day of year. The obtained results indicate that the influence of the D-region on these signals is not negligible for positioning with a single signal recorded by a single receiver during the period around the maximum of a solar cycle.",
publisher = "Astronomical Institute of the Slovak Academy of Sciences",
journal = "Contributions of the Astronomical Observatory Skalnate Pleso",
title = "Influence of the solar hydrogen Lya line on the GNSS signal delay in the ionospheric D-region",
pages = "125-116",
number = "3",
volume = "52",
doi = "10.31577/caosp.2022.52.3.116"
}

Petković, D., Odalović, O.,& Nina, A.. (2022). Influence of the solar hydrogen Lya line on the GNSS signal delay in the ionospheric D-region. in Contributions of the Astronomical Observatory Skalnate Pleso
Astronomical Institute of the Slovak Academy of Sciences., 52(3), 116-125.
https://doi.org/10.31577/caosp.2022.52.3.116

Petković D, Odalović O, Nina A. Influence of the solar hydrogen Lya line on the GNSS signal delay in the ionospheric D-region. in Contributions of the Astronomical Observatory Skalnate Pleso. 2022;52(3):116-125.
doi:10.31577/caosp.2022.52.3.116 .

Petković, Dušan, Odalović, Oleg, Nina, Aleksandra, "Influence of the solar hydrogen Lya line on the GNSS signal delay in the ionospheric D-region" in Contributions of the Astronomical Observatory Skalnate Pleso, 52, no. 3 (2022):116-125,
https://doi.org/10.31577/caosp.2022.52.3.116 . .

TY  - CONF
AU  - Petković, Dušan
AU  - Odalović, Oleg
AU  - Nina, Aleksandra
PY  - 2022
UR  - asspectro2022.ipb.ac.rs/book-AsSpectro2022c.pdf
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2678
AB  - This paper analyzes variations in the total electron content in the D-region induced by periodical changes in the solar hydrogen Lyα radiation. The considered changes are a consequence of variations in the solar radiation intensity during a solar cycle and a consequence of the Earth's revolution. The presented analysis is based on the Quiet ionospheric D-region (QIonDR) model, which shows the dependencies of ionospheric parameters on the smoothed daily sunspot number and season. We consider the vertical and slant (for different zenith angles) total electron content in the D-region (TECD) which are important for calculations of delays of satellite signals. The obtained results show a significant influence of the considered zenith angle and period of the solar cycle and season on calculating the considered ionospheric parameter.
T1  - Influence of the periodic changes in the incoming solar hydrogen Ly-α radiation intensity on the total electron content in the ionospheric D-region
EP  - 43
SP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2678
ER  - 

@conference{
author = "Petković, Dušan and Odalović, Oleg and Nina, Aleksandra",
year = "2022",
abstract = "This paper analyzes variations in the total electron content in the D-region induced by periodical changes in the solar hydrogen Lyα radiation. The considered changes are a consequence of variations in the solar radiation intensity during a solar cycle and a consequence of the Earth's revolution. The presented analysis is based on the Quiet ionospheric D-region (QIonDR) model, which shows the dependencies of ionospheric parameters on the smoothed daily sunspot number and season. We consider the vertical and slant (for different zenith angles) total electron content in the D-region (TECD) which are important for calculations of delays of satellite signals. The obtained results show a significant influence of the considered zenith angle and period of the solar cycle and season on calculating the considered ionospheric parameter.",
title = "Influence of the periodic changes in the incoming solar hydrogen Ly-α radiation intensity on the total electron content in the ionospheric D-region",
pages = "43-39",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2678"
}

Petković, D., Odalović, O.,& Nina, A.. (2022). Influence of the periodic changes in the incoming solar hydrogen Ly-α radiation intensity on the total electron content in the ionospheric D-region. , 39-43.
https://hdl.handle.net/21.15107/rcub_grafar_2678

Petković D, Odalović O, Nina A. Influence of the periodic changes in the incoming solar hydrogen Ly-α radiation intensity on the total electron content in the ionospheric D-region. 2022;:39-43.
https://hdl.handle.net/21.15107/rcub_grafar_2678 .

Petković, Dušan, Odalović, Oleg, Nina, Aleksandra, "Influence of the periodic changes in the incoming solar hydrogen Ly-α radiation intensity on the total electron content in the ionospheric D-region" (2022):39-43,
https://hdl.handle.net/21.15107/rcub_grafar_2678 .

TY  - JOUR
AU  - Nina, Aleksandra
AU  - Nico, Giovanni
AU  - Odalović, Oleg
AU  - Čadež, Vladimir M.
AU  - Todorović-Drakul, Miljana
AU  - Radovanović, Milan
AU  - Popović, Luka Č.
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1760
AB  - We investigate the influence of the perturbed (by a solar X-ray flare) ionospheric D-region on the GNSS and SAR signals. We calculate a signal delay in the D-region based on the low ionospheric monitoring by very low frequency (VLF) radio waves. Results show that the ionospheric delay in the perturbed D-region can be important and, therefore, should be taken into account in modeling the ionospheric influence on the GNSS and SAR signal propagation and in calculations relevant for space geodesy. This conclusion is significant because numerous existing models ignore the
impact of this ionospheric part on the GNSS and SAR signals due to its small electron density which is true only in quiet conditions and can result in significant errors in space geodesy during intensive ionospheric disturbances.
PB  - IEEE (Institute of Electrical and Electronics Engineers)
T2  - IEEE Geoscience and Remote Sensing Letters
T1  - GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares
DO  - 10.1109/LGRS.2019.2941643
ER  - 

@article{
author = "Nina, Aleksandra and Nico, Giovanni and Odalović, Oleg and Čadež, Vladimir M. and Todorović-Drakul, Miljana and Radovanović, Milan and Popović, Luka Č.",
year = "2019",
abstract = "We investigate the influence of the perturbed (by a solar X-ray flare) ionospheric D-region on the GNSS and SAR signals. We calculate a signal delay in the D-region based on the low ionospheric monitoring by very low frequency (VLF) radio waves. Results show that the ionospheric delay in the perturbed D-region can be important and, therefore, should be taken into account in modeling the ionospheric influence on the GNSS and SAR signal propagation and in calculations relevant for space geodesy. This conclusion is significant because numerous existing models ignore the
impact of this ionospheric part on the GNSS and SAR signals due to its small electron density which is true only in quiet conditions and can result in significant errors in space geodesy during intensive ionospheric disturbances.",
publisher = "IEEE (Institute of Electrical and Electronics Engineers)",
journal = "IEEE Geoscience and Remote Sensing Letters",
title = "GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares",
doi = "10.1109/LGRS.2019.2941643"
}

Nina, A., Nico, G., Odalović, O., Čadež, V. M., Todorović-Drakul, M., Radovanović, M.,& Popović, L. Č.. (2019). GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares. in IEEE Geoscience and Remote Sensing Letters
IEEE (Institute of Electrical and Electronics Engineers)..
https://doi.org/10.1109/LGRS.2019.2941643

Nina A, Nico G, Odalović O, Čadež VM, Todorović-Drakul M, Radovanović M, Popović LČ. GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares. in IEEE Geoscience and Remote Sensing Letters. 2019;.
doi:10.1109/LGRS.2019.2941643 .

Nina, Aleksandra, Nico, Giovanni, Odalović, Oleg, Čadež, Vladimir M., Todorović-Drakul, Miljana, Radovanović, Milan, Popović, Luka Č., "GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares" in IEEE Geoscience and Remote Sensing Letters (2019),
https://doi.org/10.1109/LGRS.2019.2941643 . .