Analysis of magnetospheric ELF/VLF wave amplification from the Siple Transmitter experiment

Controlled experiments with dedicated ground-based ELF/VLF (0.3-30 kHz) transmitters are invaluable in investigating nonlinear whistler mode wave-particle interactions in the Earth's magnetosphere. The most productive such experiment operated between 1973 and 1988 near L = 4 at Siple Station, A...

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Bibliographic Details
Published in:Journal of Geophysical Research: Space Physics
Other Authors: İnan, Umran Savaş (ORCID 0000-0001-5837-5807 & YÖK ID 177880), Li, J. D.; Spasojevic, M.; Harid, V.; Cohen, M. B.; Golkowski, M., College of Engineering, Department of Electrical and Electronics Engineering
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union (AGU) 2014
Subjects:
Astronomy and astrophysics
Hot plasma distribution
Whistler-mode signals
VLF transmitter
Antarctica
Station
Injection
Propagation
Stimulation
Emissions
Threshold
Antarc*
Online Access:https://doi.org/10.1002/2013JA019513
http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/664
Description
Summary:Controlled experiments with dedicated ground-based ELF/VLF (0.3-30 kHz) transmitters are invaluable in investigating nonlinear whistler mode wave-particle interactions in the Earth's magnetosphere. The most productive such experiment operated between 1973 and 1988 near L = 4 at Siple Station, Antarctica. A major effort has been undertaken to digitize and preserve a significant portion of the historical data set from the original magnetic tapes, and we describe here the data set and the processing techniques used to remove artifacts introduced during recording and playback. We analyze a commonly transmitted diagnostic format from 1986 and present statistics on the occurrence and properties of amplified ELF/VLF waves received by a ground-based receiver at the geomagnetic conjugate location to Siple at Lake Mistissini, Quebec. For the interval examined, only 11% of Siple transmissions are successfully received in the conjugate hemisphere with quiet geomagnetic conditions being significantly more conducive to successful reception. The total growth for the events examined is estimated to be 5-40 dB, and nonlinear growth rates are in the range of 20-350 dB/s. The observations show that as the nonlinear growth rate increases, the duration of nonlinear growth decreases. Significant linear correlation is found between the noise floor and the saturation level, with higher noise floors resulting from increases in natural magnetospheric emissions. Finally, we find a lack of correlation between the nonlinear growth rate and the noise, threshold, and saturation levels. AFRL

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