We present the first report of global ionospheric disturbances due to most powerful Gamma Ray Burst GRB221009A occurred on 9 October 2022. Very Low Frequency (VLF) and (LF) sub-ionospheric radio signals are used diagnose effect GRB lower ionosphere. Both daytime nighttime effects analyzed in VLF LF bands. The magnitude signal perturbations varied with propagation condition (day/night), path len...

In this study we appraised the accuracy of the Finometer in spectral analysis of systolic (SAP) and diastolic (DAP) arterial pressure. In 24 patients the blood pressure signal was simultaneously recorded invasively and by the Finometer and the power of SAP and DAP in the VLF (0.01÷0.04Hz), LF (0.04÷0.15Hz), and HF (0.15÷0.45Hz) bands computed. To investigate the relationship between invasive an...

[1] Measurements of the input impedance of two very low frequency (VLF) transmitters in Antarctica are used to validate existing dielectric models for the ice substrate at these frequencies. Using a finite difference time domain approach, Maxwell’s equations are solved in the presence of dispersive media, representing the layers of ice which form the Antarctic ice sheet as a single-pole Debye m...

Very low frequency (VLF) remote sensing observations of multifaceted local and conjugate ionospheric perturbations from geographically identified and well-characterized oceanic lightning discharges are presented for the first time. Lightning-induced electron precipitation (LEP) events are shown to produce disturbances first in the conjugate hemisphere and subsequently in the hemisphere of the c...

[1] Cohen et al. [2008] overlook observations presented by Barr et al. [1988], which have a direct and possibly significant impact on two of their primary conclusions. The two conclusions of interest are: 1) that ‘geometric modulation’ in the form of circle-sweeping is significantly more efficient than amplitude modulation at generating ELF/VLF waves, and 2) that the ELF/VLF beam generated usin...

The very low frequency electromagnetic (VLFEM) technique is well established for rapid geological mapping and detection of buried conductive targets. The technique makes use of signal radiation from military navigation radio transmitters. There are about 42 global ground military communication transmitters operating in VLF frequency in the range of 15–30 kHz. These stations, located around the ...

Previously, we demonstrated that very low-frequency (VLF) blood pressure variability (BPV) depends on voltage-gated L-type Ca(2+)-channels, suggesting that autoregulation of blood flow and/or myogenic vascular function significantly contributes to VLF BPV. To further substantiate this possibility, we tested the hypothesis that the frequency response characteristic of whole body autoregulation o...

[1] It is shown theoretically that for high power HF ionospheric heaters, such as the current HAARP heater, the HF to VLF conversion can increase significantly by using a two-timescale heating. A long heating pulse, tp 1minute, is followed over the same timescale period bymodulation at the desired ELF/VLF frequency. The long pulse reduces the electron-ion recombination coefficient, resulting in...