[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...

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...

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...

We present observations of narrowband subionospheric VLF transmitter signals on 20 March 2001, exhibiting coherent fluctuations of over 1 dB peak to peak. Spectral analysis shows that the fluctuations have periods of 1–4min and are largely coherent. The subionospheric propagation path of the signal from Puerto Rico to Colorado passes over two regions of convective and lightning activity, as obs...

[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...

In this paper, the amplitude probability density (APD) of the wideband extremely low frequency (ELF) and very low frequency (VLF) atmospheric noise is studied. The electromagnetic signals from the atmosphere, referred to herein as atmospheric noise, was recorded by a mobile low-temperature superconducting quantum interference device (SQUID) receiver under magnetically unshielded conditions. In ...

Scaling analysis of heart rate time series has emerged as a useful tool for the assessment of autonomic cardiac control. We investigate the heart rate time series of ten athletes (five males and five females), by applying detrended fluctuation analysis (DFA). High resolution ECGs are recorded under standardized resting conditions over 30 min and subsequently heart rate time series are extracted...