Abstract
The recently developed high-quality WHU ELF/VLF receiver system has been deployed in Suizhou, China (geomagnetic latitude 21.81°N, longitude 174.44°E, L=1.16) to detect low latitude extremely-low-frequency (ELF: 0.3‒3 kHz) and very-low-frequency (VLF: 3‒30 kHz) emissions originating from either natural or artificial sources since February 2016. During the first-month operation of the receiver system, a total of 3039 clear whistlers have been recorded at this low latitude station with the majority (97.0%) occurring on 28 February and 1 March 2016. Observed whistlers manifest various types including single one-hop, echo train, multi-flash, and multi-path. They tend to intensify after local midnight, reach the peak around 04‒05 LT, and then weaken quickly. Both features of lower cutoff frequencies of most whistlers below ∼1.6 kHz and almost uniform dispersion for many successive multi-flash whistlers suggest that these whistlers propagate along the geomagnetic field lines in the duct mode. The computed dispersion varies between ∼15 s1/2 and 23 s1/2 for observed one-hop whistlers and is greater than 50 s1/2 for three-hop echo train whistlers, indicating that the whistlers observed at the Suizhou station are low latitude whistlers.
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