A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares
Very Low Frequency (VLF) and Low Frequency (LF) signal perturbations were examined to study ionospheric disturbances induced by solar X-ray flares in order to understand processes involved in propagation of VLF/LF radio signals over short paths and to estimate specific characteristics of ea...
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| Format: | Article |
| Language: | English |
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Astronomical Observatory, Department of Astronomy, Belgrade
2014-01-01
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| Series: | Serbian Astronomical Journal |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1488045S.pdf |
| _version_ | 1819109780148453376 |
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| author | Šulić D.M. Srećković V.A. |
| author_facet | Šulić D.M. Srećković V.A. |
| author_sort | Šulić D.M. |
| collection | DOAJ |
| description | Very Low Frequency (VLF) and Low Frequency (LF) signal perturbations were
examined to study ionospheric disturbances induced by solar X-ray flares in
order to understand processes involved in propagation of VLF/LF radio signals
over short paths and to estimate specific characteristics of each short path.
The receiver at the Belgrade station is constantly monitoring the amplitude
and phase of a coherent and subionospherically propagating LF signal operated
in Sicily NSC at 45.90 kHz, and a VLF signal operated in Isola di Tavolara
ICV at 20.27 kHz, with the great circle distances of 953 km and 976 km,
respectively. A significant number of similarities between these short paths
is a direct result of both transmitters and the receiver’s geographic
location. The main difference is in transmitter frequencies. From July 2008
to February 2014 there were about 200 events that were chosen for further
examination. All selected examples showed that the amplitude and phase of VLF
and LF signals were perturbed by solar X-ray flares occurrence. This six-year
period covers both minimum and maximum of solar activity. Simultaneous
measurement of amplitude and phase of the VLF/LF signals during a solar flare
occurrence was applied to evaluate the electron density profile versus
altitude, to carry out the function of time over the middle Europe. [Projekat
Ministarstva nauke Republike Srbije, br. 176002 i br. III4402] |
| first_indexed | 2024-12-22T03:31:16Z |
| format | Article |
| id | doaj.art-cfea3591786b4880a1f97e264f5ebf0f |
| institution | Directory Open Access Journal |
| issn | 1450-698X 1820-9289 |
| language | English |
| last_indexed | 2024-12-22T03:31:16Z |
| publishDate | 2014-01-01 |
| publisher | Astronomical Observatory, Department of Astronomy, Belgrade |
| record_format | Article |
| series | Serbian Astronomical Journal |
| spelling | doaj.art-cfea3591786b4880a1f97e264f5ebf0f2022-12-21T18:40:30ZengAstronomical Observatory, Department of Astronomy, BelgradeSerbian Astronomical Journal1450-698X1820-92892014-01-012014188455410.2298/SAJ1488045S1450-698X1488045SA comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flaresŠulić D.M.0Srećković V.A.1University Union Nikola Tesla, BelgradeInstitute of physics, BelgradeVery Low Frequency (VLF) and Low Frequency (LF) signal perturbations were examined to study ionospheric disturbances induced by solar X-ray flares in order to understand processes involved in propagation of VLF/LF radio signals over short paths and to estimate specific characteristics of each short path. The receiver at the Belgrade station is constantly monitoring the amplitude and phase of a coherent and subionospherically propagating LF signal operated in Sicily NSC at 45.90 kHz, and a VLF signal operated in Isola di Tavolara ICV at 20.27 kHz, with the great circle distances of 953 km and 976 km, respectively. A significant number of similarities between these short paths is a direct result of both transmitters and the receiver’s geographic location. The main difference is in transmitter frequencies. From July 2008 to February 2014 there were about 200 events that were chosen for further examination. All selected examples showed that the amplitude and phase of VLF and LF signals were perturbed by solar X-ray flares occurrence. This six-year period covers both minimum and maximum of solar activity. Simultaneous measurement of amplitude and phase of the VLF/LF signals during a solar flare occurrence was applied to evaluate the electron density profile versus altitude, to carry out the function of time over the middle Europe. [Projekat Ministarstva nauke Republike Srbije, br. 176002 i br. III4402]http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1488045S.pdfsolar-terrestrial relationsSun: activitySun: flaresSun: X-rays, gamma raysX-rays: bursts |
| spellingShingle | Šulić D.M. Srećković V.A. A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares Serbian Astronomical Journal solar-terrestrial relations Sun: activity Sun: flares Sun: X-rays, gamma rays X-rays: bursts |
| title | A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares |
| title_full | A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares |
| title_fullStr | A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares |
| title_full_unstemmed | A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares |
| title_short | A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares |
| title_sort | comparative study of measured amplitude and phase perturbations of vlf and lf radio signals induced by solar flares |
| topic | solar-terrestrial relations Sun: activity Sun: flares Sun: X-rays, gamma rays X-rays: bursts |
| url | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1488045S.pdf |
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