Long-Term Averages of Globally-Measured ELF/VLF Radio Noise
STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB (STAR)
Pagination or Media Count:
In this report we present the results of a statistical study of a year of data obtained as part of the STAR Laboratorys global survey of ELFVLF radio noise frequencies in the range 10 Hz to 32 kHz. The data included in the study were obtained from seven measurement instruments radiometers located at both high and low latitudes. Average amplitude and voltage deviation d statistics from each of the six stations were first divided into four three- month seasons and then averaged at every measurement frequency to give two separate sets of long-term averages. Long-term averages show characteristic trends in the measurements due to the manner in which noise propagates in the earth-ionosphere waveguide. The average amplitudes of the measurements decrease with frequency, reaching a minimum around 1 kHz, and rise again towards 10 kHz. The voltage deviation amplitudes generally rise with frequency except for a depression of values around 1 kHz.
- Radiofrequency Wave Propagation
- Radio Communications