A study of VLF signals variations associated with the changes of ionization level in the D-region in consequence of solar conditions

  title={A study of VLF signals variations associated with the changes of ionization level in the D-region in consequence of solar conditions},
  author={Desanka M. {\vS}uli{\'c} and Vladimir A. Sre{\'c}kovi{\'c} and Anatolij A. Mihajlov},
  journal={Advances in Space Research},

Solar flare effects on D-region ionosphere using VLF measurements during low- and high-solar activity phases of solar cycle 24

The effects of solar flares on the propagation of subionospheric VLF signals from NWC and NLK transmitter stations monitored at a low-latitude station, Suva (18.2°S, 178.4°E), Fiji, between December

On the Use of VLF Narrowband Measurements to Study the Lower Ionosphere and the Mesosphere–Lower Thermosphere

The ionospheric D-region (~60 km up to ~95 km) and the corresponding neutral atmosphere, often referred to as the mesosphere–lower thermosphere (MLT), are challenging and costly to probe in situ.


Solar radiation has the most important role in periodical variation of terrestrial atmospheric properties. Under unperturbed ionospheric conditions, the solar Lyα line has a dominant influence on

Multi-instrumental investigation of the solar flares impact on the ionosphere on 05–06 December 2006

The sudden increase of X-radiation and EUV emission following solar flares causes additional ionization and increased absorption of electromagnetic (EM) waves in the Earth’s atmosphere. The solar

Low Ionosphere under Influence of Strong Solar Radiation: Diagnostics and Modeling

Solar flares (SFs) and intense radiation can generate additional ionization in the Earth’s atmosphere and affect its structure. These types of solar radiation and activity create sudden ionospheric

Novel Modelling Approach for Obtaining the Parameters of Low Ionosphere under Extreme Radiation in X-Spectral Range

Strong radiation from solar X-ray flares can produce increased ionization in the terrestrial D-region and change its structure. Moreover, extreme solar radiation in X-spectral range can create sudden

Broadband longwave radio remote sensing instrumentation.

A significant upgrade to the AWESOME is presented, in which the frequency range has been extended to include the LF and part of the medium frequency (MF) bands, the sensitivity improved by 10-25 dB to be as low as 0.03 fT/ Hz , depending on the frequency, and timing error reduced to 15-20 ns range.

Solar X-ray flares effects in amplitude and phase variations of VLF-signals of radio stations registered in Yakutsk during 2009-2016

The magnitude of sudden phase and amplitude anomalies (SPA and SAA) on the Novosibirsk-Yakutsk, KrasnodarYakutsk and Khabarovsk-Yakutsk VLF radio propagation paths during 2009-2016 as a function of

The First Solar Flare Effect Observation at UiTM-SID Station during Solar Cycle 23-24

International Heliophysical Year (IHY; 2007-2009) has a remarkable impact on space and earth electromagnetism research and society. For Malaysian perspectives, it acts as a spiral point to the

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

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)



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

Classification of X-ray solar flares regarding their effects on the lower ionosphere electron density profile

The classification of X-ray solar flares is performed regarding their effects on the Very Low Frequency (VLF) wave propagation along the Earth-ionosphere waveguide. The changes in propagation are

D-region electron density evaluated from VLF amplitude time delay during X-ray solar flares

Diurnal phase variation of VLF waves at medium distances

Methods of phase measurements at VLF are briefly described. So me r esu lts of diurnal phase m easurements, sunrise elfects, and solar flare effects at medium distances and northern geographical