Recurrent VLF amplitude fluctuations - Detection using a filter and correspondence with geomagnetic disturbances

Details Recurrent VLF amplitude fluctuations - Detection using a filter and correspondence with geomagnetic disturbances Recurrent VLF amplitude fluctuations - Detection using a filter and correspondence with geomagnetic disturbances

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2423m&link_type=abstract

Journal of Geophysical Research, vol. 81, May 1, 1976, p. 2423-2428.

Physics

Magnetic Disturbances, Radio Transmission, Signal Fading, Sudden Ionospheric Disturbances, Twenty-Seven Day Variation, Very High Frequencies, Amplitudes, Bandpass Filters, D Region, Data Recording, Ionospheric Propagation, Magnetic Storms, Monitors, Solar Activity Effects

Scientific paper

Rapid fluctuations in the signal strength of the 18.6-kHz transmission from NLK, Jim Creek, Washington, along the 2100-km path to St. Cloud, Minnesota, were monitored continuously for several months. A special band-pass filter, with center period of 120 s, was used to separate relatively small amplitude fluctuations from the overall signal level. Raw data strip chart recordings for 216 consecutive days show that nighttime amplitude fluctuations tend to repeat at 27-day intervals corresponding to the solar rotation period. A strong correlation also appears between the amount of nighttime amplitude fluctuation and the amount of daily geomagnetic activity as indicated by magnetic indices. This rapid fluctuation behavior of the signal strength, which is most likely caused by varying particle precipitation along the radio propagation path, displays a definiteness of character which makes it especially suitable for detecting and monitoring changes of the lower ionosphere related to geomagnetic disturbances.

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