Scaling analysis of heart rate time series has emerged as an useful tool for 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 minutes and subsequently heart rate time series are extracte...

The very low frequency (VLF) propagation mapper (VPM) is a 6U CubeSat designed to measure VLF radio waves in Low-Earth Orbit. science goals of the VPM mission are signals broadcast by DSX mission, and study natural anthropogenic (from lightning transmitters) near-Earth space environment. primary payload consists an electric field dipole antenna deployed 2 meters length, magnetic search coil 50 ...

Abstract The new type of daytime natural very low frequency (VLF) whistler mode emissions the magnetospheric origin was found in VLF observations at Kannuslehto station ( L ∼ 5.5) Northern Finland. events occurred frequencies above 4–5 kHz even up to 15 kHz. These have never been observed earlier spectrograms because they were hidden by strong impulsive atmospherics (sferics) same range origina...

A retrospective analysis of complex geophysical data around the time two most powerful earthquakes that occurred in Alaska and had magnitudes M = 8.2 (29 July 2021) 9.2 (28 March 1964), respectively, is carried out. The aim research to assess maximum possible magnitude electric field a seismogenic nature penetrated ionosphere/plasmasphere, which could cause ionospheric effects observed experime...

A detailed analysis of the VLF emissions data obtained during occasional whistler campaigns at the low-latitude ground station Agra (geomagnetic latitude 17°1¢ N, L = 1.15) has yielded some unusual discrete VLF emissions of the rising type. These include (1) emissions occurring at time intervals increasing in geommetrical progression, (2) emissions occuring simultaneously in di€erent frequency ...

Intense HF radiation from a ground-based facility heats the D-region of the ionosphere. The heating modifies the electron energy distribution function, which is found by solving the kinetic equation at each spatial location. The solution selfconsistently takes into account attenuation of HF radiation due to modified HF conductivity. A modulation HF radiation at ELF/VLF frequencies creates corre...